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Maybeit’’sasignofamaturemindwhensomeoflife’’sbiggerquestions-aboutlovefaithambition-suddenlyseemmoremanageablethansmalleronessuchas:WhydidIjustopentherefrigeratorWhereonearthdidIputmykeysWheredidIwritedownthatphonenumber Ourcapacityforstoringandrecallinginformationdoesnotstreamdownlikesandthroughanhourglassasneurologistsoncebelieved.Onthecontrarynewresearchsuggeststhatwhenstimulatedintherightwaybrainsofalmostanyagecangivebirthtocellsandforgefreshpathwaystofileawaynewinformation.Thisemergingpicturehasnotonlyencouragedthosewhotreatandcareforthe5%ofolderadultswhohavedementia痴呆症suchasAlzheimer’’sdiseasebutalsogeneratedawaveofoptimismamongthosestudyingmemorychangesintheother95%aswellasanincreasingpublicfascinationwithmemoryenhancementdietarysupplementsbooksandbrain-improvingtechniques. Theslightfailuresofmemorythatmanyofusattributetoafailingbrainareoftenduetosomethingentirelydifferent:anxietysleepproblemsdepressionevenheartdisease.Thebiologicalnutsandboltsoflearningandmemoryinfactchangelittleovertimeinhealthypeopleresearcherssay.There’’sverylittlecelllossandstructurallyallthemachineryisthereevenverylateinlifesaidaneuroscientistGregCole.It’’sthecells’’speedandabilitytosendandreceivesignalsthatdiminishgraduallywhichiswhatmakesthemindgoblankwhentryingtorecallfamiliarwordsandnames. Formorethanadecaderesearchershaveknownthatpeoplewhohaveactiveintellectuallychallenginglivesarelesslikelytodevelopdementiathanthosewhodonot.Partofthisdifferenceisattributabletointelligencesomedoctorsbelieve:Themoreyoustartwiththelongerittakestoloseit.Andnewevidencesuggeststhattheactofusingyourbrainisinitselfprotectivenomatterwhoyouare. AlloftheactivitiessuchasreadingnewspaperswatchingTVplayinggamesetc.canimprovepeople’’sscoresonstandardtestsmeasuringrecallofnumbersandnamesexpertssay.Theyalsoacknowledgehoweverthatthereisabigdifferencebetweenplayingchesswithafriendanddoingamentalexercisesuchasmemorizingnumbers.Oneisanorganicpartofaperson’’slifetheotherapurelyintellectualexercisedoneinisolation.Thefirstisfun;thesecondoftenisatiringtask. Expertssuggestthatthebestwaytoavoidmemoryfailuresis
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Therewillbeasteadytrendtowardvegetarianism.Agivenquantityofgroundcanprovideplantfoodformanoritcanprovideplantfoodforanimalswhicharelaterkilledformeat. Inconvertingthetissuesoffoodintothetissuesofthefeederupto90percentisusedforreasonsotherthantissuemaintenanceandgrowth.Thismeansthatonehundredpoundsofplantfoodwillsupporttenpoundsofhumantissue―whileonehundredpoundsofplantfoodwillsupporttenpoundsofanimaltissuewhichwillthensupportonepoundofhumantissue.Inotherwordslanddevotedtoplantfoodwillsupporttentimesasmanyhumanbeingsaslanddevotedtoanimalfood. Itisthisfarmorethanfoodpreferencesorreligiousdirectionsthatforcesovercrowdedpopulationsintovegetarianism.AnditwillbethedirectioninwhichtheUnitedStatesof2001willbemoving―notbypresidentialorderbutthroughtheforceofasteadyriseinmeatpricesascomparedwithotherkindsoffood. Thisinturnwillcomeaboutbecauseourherdswilldecreaseasthefooddemandcausesmoreandmoremeadowtobeturnedtofarmlandandaslandproducingcornandotheranimalfoodisconvertedtoprovidingfooddirectlyforman. Anotherpointisthatitisnotonlyenergythatisinshortsupply.Ashortageofoilmeansashortageofplastics;ashortageofelectricitymeansashortageofaluminium.Wearealsoexperiencingashortageofpaperandmostotherrawmaterials. Thismeansthatforonethingourgenerosityinwrappingbaggingandpackagingwillhavetorecede.Therewillhavetobeatleastapartialreturninsupermarketstotheolddayswheregoodsweresuppliedinbulkandgivenoutinbagstoorder.Itmayevenbecomenecessarytoreturnbagsasweoncereturnedbottlesorpayfornewones. Adeclineinper-capitaenergyusewillmakeitnecessarytoresorttohumanmuscleagainsothatthedeliverymanwillmakeacomebackhispriceaddedtothatofthefoodofcourse.Sinceenergyshortageswillcauseunemploymentinmanysectorsoftheeconomytherewillbeidlehandstodothemanualworkthatwillbecomenecessary. Fromanenergy-savingstandpointitwouldmakefarmoresensetoorderbyphoneandhaveasingletruckdeliverfoodtomanyhomesthanforamemberofeachhometodriveanautomobileround-triptopickupaone-familyfoodsupply. Tobesureitwillnotallberetrogression.EvenassumingthatEarthisinadesperatebattleofsurvivalthroughacrisisofstillrisingpopulationanddwindlingenergyreservesthereshouldstillcontinuetobetechnologicaladvancesinthosedirectionsthatdon’’tdependonwastefulbulkuseofenergy.Therewillbecontinuingadvancesinthedirectionofsophisticationinotherwords. Weknowfromthetextthat
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Atthestartofthe20thcenturyimmigrantlaborandinnovationhelpedturntheU.S.intoapowerfulmanufacturingnation.Todayforeign-bornengineersjamthecorridorsofSiliconValleyhelpingAmerica’’sinformation-technologyboom.Andasthe21stcenturydawnsyetanotherwaveofimmigrantswillonceagainhelptransformtheeconomy. 46DuringthenextdecadeexceptingachangeingovernmentpolicynearlyamillionimmigrantsareexpectedtoarriveintheU.S.everyyearmostofwhombothlegalandillegalwillcontinuetocomefromLatinAmericaandSoutheastAsiabuteveryforeignlandwillberepresented. Asdomesticbirthratesstagnateonlyforeign-bornworkerwillkeepthelaborpoolgrowing.By2006infactimmigrantswillaccountforhalfofallnewU.S.workers;overthenext30yearstheirsharewillriseto60%. 47EvenatcurrentlevelsofimmigrationaccordingtotheLaborDept.thenumberofpeopleavailabletoworkwillincreasebyamere0.8%peryearbetween1996and2006-halftherateofthepreviousdecade.WithoutimmigrantsaccordingtoanewstudytheU.S.workforcewouldactuallybegintoshrinkby2015. 48It’’snotallaboutsheernumbersofcourse:ToliftproductivityandspurgrowthimmigrantsmustprovidecreativityentrepreneurialenergyorsimpleinitiativethatAmericacouldn’’tfindotherwise.IfallyoudidwasbringinpeoplewhoareexactlythesameasthosewehaveheretherewouldbenoeconomicbenefitsaysRandCorp.economistJamesP.SmithYou’’djusthavemorepeople. Justascrucialthearrayofeducationandskillsimmigrantsbringcouldfitneatlywiththesupplyofjobsoverthenextdecade.AccordingtoLindaLevineattheCongressionalResearchService60%ofthejobscreatedthrough2005willrequiresomepost-secondaryeducation.Butsheaddslow-skilljobswillstillrepresentabouthalfoftotalemployment.49Yetimmigrantsalsoare50%morelikelythanAmericanstohaveagraduatedegreeandanunbelievable23%ofU.S.residentsholdingPhDsinscienceandengineeringareforeign-bornaccordingtotheNationalScienceFoundation. Indeedforeign-bornworkershaveshownanextraordinaryabilitytoassimilateandflourish.Certainlysomelessskilledworkerswillremainatthebottomeconomicrungalltheirlives.50Yetotherswillcatchupquicklyandwithinadecadeoftheirarrivalthewell-educatedwillgofrommakingbarelyhalfthatofnative-bornAmericansincomparableworktonearly90%accordingtoarecentstudy. Thatofcoursewillraiseimmigrants’’livingstandards.Moreimportantitwillhelpdriveinnovationandentrepreneurshipkeyenginesofthe21stCenturyEconomy.
Atthestartofthe20thcenturyimmigrantlaborandinnovationhelpedturntheU.S.intoapowerfulmanufacturingnation.Todayforeign-bornengineersjamthecorridorsofSiliconValleyhelpingAmerica’’sinformation-technologyboom.Andasthe21stcenturydawnsyetanotherwaveofimmigrantswillonceagainhelptransformtheeconomy. 46DuringthenextdecadeexceptingachangeingovernmentpolicynearlyamillionimmigrantsareexpectedtoarriveintheU.S.everyyearmostofwhombothlegalandillegalwillcontinuetocomefromLatinAmericaandSoutheastAsiabuteveryforeignlandwillberepresented. Asdomesticbirthratesstagnateonlyforeign-bornworkerwillkeepthelaborpoolgrowing.By2006infactimmigrantswillaccountforhalfofallnewU.S.workers;overthenext30yearstheirsharewillriseto60%. 47EvenatcurrentlevelsofimmigrationaccordingtotheLaborDept.thenumberofpeopleavailabletoworkwillincreasebyamere0.8%peryearbetween1996and2006-halftherateofthepreviousdecade.WithoutimmigrantsaccordingtoanewstudytheU.S.workforcewouldactuallybegintoshrinkby2015. 48It’’snotallaboutsheernumbersofcourse:ToliftproductivityandspurgrowthimmigrantsmustprovidecreativityentrepreneurialenergyorsimpleinitiativethatAmericacouldn’’tfindotherwise.IfallyoudidwasbringinpeoplewhoareexactlythesameasthosewehaveheretherewouldbenoeconomicbenefitsaysRandCorp.economistJamesP.SmithYou’’djusthavemorepeople. Justascrucialthearrayofeducationandskillsimmigrantsbringcouldfitneatlywiththesupplyofjobsoverthenextdecade.AccordingtoLindaLevineattheCongressionalResearchService60%ofthejobscreatedthrough2005willrequiresomepost-secondaryeducation.Butsheaddslow-skilljobswillstillrepresentabouthalfoftotalemployment.49Yetimmigrantsalsoare50%morelikelythanAmericanstohaveagraduatedegreeandanunbelievable23%ofU.S.residentsholdingPhDsinscienceandengineeringareforeign-bornaccordingtotheNationalScienceFoundation. Indeedforeign-bornworkershaveshownanextraordinaryabilitytoassimilateandflourish.Certainlysomelessskilledworkerswillremainatthebottomeconomicrungalltheirlives.50Yetotherswillcatchupquicklyandwithinadecadeoftheirarrivalthewell-educatedwillgofrommakingbarelyhalfthatofnative-bornAmericansincomparableworktonearly90%accordingtoarecentstudy. Thatofcoursewillraiseimmigrants’’livingstandards.Moreimportantitwillhelpdriveinnovationandentrepreneurshipkeyenginesofthe21stCenturyEconomy.
AsAmerica’’sairbecomessteadilymorecontaminatedactivitiesacrossthenationtocopewithsmogappeartobelaggingfurtherandfurtherbehindactualneedsdespitearisingpublicclamorforimprovement. Therehasbeenaconsiderableprogressinthelastcoupleofyears.Buttheover-allpictureisthatsomanylocalitieshaven’’treallycometogripswiththeairpollutionproblemthatpeoplemightbedismayediftheyknewhowtheirwelfarewasbeingtrifledwith. Airpollutionsourcesarenowhurlingmorethan140milliontonsofcontaminantsintotheatmosphereeveryyearbyFederalestimates.Twoyearsagoitwasonly130milliontons. Theincreasehasbeencausedbymanythings--morepeoplemoreautomobilesmoreindustrymorespaceheatinglittleifanyreductionthatmoreoftenthannotareinadequate. Theadversehealtheffectsofairpollutionarebecomingmorewidelyrecognizedalthoughspecificmedicalevidenceisstillfragmentary.Asapsychologicalannoyanceoftencalledanestheticfactorittranslatesintodecreasedpropertyvalues.Indamagetocropsandotherplantsitscostisreckonedinmillionsofdollars;indamagetostructuresandmaterialsinbillions. Federalandstatepollutioncontrolofficialsreportthefollowinghighlightofthecurrentsituation. Statesandlocalitiesgenerallystillhavepenaltiesforairpollutionthatarelittlemorethanawristslapwithfinesaslowas＄10.Enforcementisgenerallysketchyandweak.Andtheremedialproceduresaresocumbersomethatmoreandmoretheyarebeingbypassedbysimplelawsuitsbroughtbypublicofficialsorcitizens. AlthoughFederallawhasrequiredautomakerstoprovidevehicleswithfumecontrolequipmentfewstateshavedoneanythingtoassureitseffectivenessafteracarhasleftthefactorybyprovidingforregularinspectionoftheequipment. Publicofficialsinmanyplacesstillseemtoconsiderburstsofcomplaintsfromcitizenspreferabletocomplaintstheymightgetfrominstitutingeffectiveairqualityprograms.Industriesandotherpolluterssuchasmunicipalitiesstillexertgreatinfluenceopposingorweakeningregulatorylawsandpackingregulatoryboardswiththeirownspokesmen. Publicresentmentoverairpollutionisgrowingasisshownbyrecurringincidentsofpicketing设置纠察员andincreasingnumberoflegalactions. ThebigFederalprogramtocombatairpollutionunderwayforseveralyearsisproceedingfairlyclosetoschedule.ButFederalauto-fumeregulationswillnotbeveryproductivefornearlyadecadeuntilaround100millionunregulatedolder-generationcarshavebeenreplacedonthehighways. ThepartoftheFederaleffortthatdealswithstationarypollutionsourceslikefactoriesisstilllargelyinanorganizationalphaseyieldinglittleimmediatereductioninfumes. ThewordhurlinginPar.3maybebestreplacedby
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
SectionⅠUseofEnglishDirections:Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABt2orDonANSWERSHEETI.BlackdeaththatdroveNewtonfromhiscollegeandintoamomentousdiscovery1Englandin1665.Astronomicalrecordsofthetimeshowthat2wasayearofintensesun-spotactivityandstudiesofannualtree3whicharewiderwhenthesunisdisturbed4thattheterribleplagueof1348was5accompaniedbyanactivesun.Thissoundsincredible6wenowhaveevidencethatthesunhasadirecteffectonsomeofourbody7.Over120000testsmadeonpeopleinaBlackSea8tomeasurethenumberoflymphocytesintheirblood.Thesesmallcellsnormally9between20and25percentofman’swhitebloodcellsbutinyearsofgreatsolaractivitythis10decreases.Therewasabiffdropduringthesunspotyearsof1986and1987andnumberofpeople11fromdiseasescausedbyalymphocytedeficiency12doubledduringthetremendoussolarexplosionofFebruary1986.Manyofthebody’s13seemtobeinfluencedbysun-inducedchangesintheearth’smagnetic14.Ifthisissoone15tofindthatthenervoussystemwhichdependsonelectricalstimuliwouldbethemost16.Astudyof5580coal—mineaccidents17theRuhrrivershowsthatmostoccurredonthedayfollowingsolaractivity.StudiesoftrafficaccidentsinRussiaandinGermanyshowthattheseincreasebyasmuchasfour18theaverageondaysafterthe19ofasolarflare.Thissuggeststhataccidentsmaybe20adisturbancedeeperthanasimpledecreaseinreactiontime.Theseresultsmakeitclearthatmanisamongotherthingsaremarkablysensitiveliving.sundial. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCorDonANSWERSHEET1.2
Studythefollowingcartooncarefullyandwriteanessayinwhichyoushould 1describethecartoon 2interpretitsmeaningand 3suggestpossiblecoursestotake. Youshouldwriteabout160-200wordsneatlyonANSWERSHEET2.20points
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Maybeit’’sasignofamaturemindwhensomeoflife’’sbiggerquestions-aboutlovefaithambition-suddenlyseemmoremanageablethansmalleronessuchas:WhydidIjustopentherefrigeratorWhereonearthdidIputmykeysWheredidIwritedownthatphonenumber Ourcapacityforstoringandrecallinginformationdoesnotstreamdownlikesandthroughanhourglassasneurologistsoncebelieved.Onthecontrarynewresearchsuggeststhatwhenstimulatedintherightwaybrainsofalmostanyagecangivebirthtocellsandforgefreshpathwaystofileawaynewinformation.Thisemergingpicturehasnotonlyencouragedthosewhotreatandcareforthe5%ofolderadultswhohavedementia痴呆症suchasAlzheimer’’sdiseasebutalsogeneratedawaveofoptimismamongthosestudyingmemorychangesintheother95%aswellasanincreasingpublicfascinationwithmemoryenhancementdietarysupplementsbooksandbrain-improvingtechniques. Theslightfailuresofmemorythatmanyofusattributetoafailingbrainareoftenduetosomethingentirelydifferent:anxietysleepproblemsdepressionevenheartdisease.Thebiologicalnutsandboltsoflearningandmemoryinfactchangelittleovertimeinhealthypeopleresearcherssay.There’’sverylittlecelllossandstructurallyallthemachineryisthereevenverylateinlifesaidaneuroscientistGregCole.It’’sthecells’’speedandabilitytosendandreceivesignalsthatdiminishgraduallywhichiswhatmakesthemindgoblankwhentryingtorecallfamiliarwordsandnames. Formorethanadecaderesearchershaveknownthatpeoplewhohaveactiveintellectuallychallenginglivesarelesslikelytodevelopdementiathanthosewhodonot.Partofthisdifferenceisattributabletointelligencesomedoctorsbelieve:Themoreyoustartwiththelongerittakestoloseit.Andnewevidencesuggeststhattheactofusingyourbrainisinitselfprotectivenomatterwhoyouare. AlloftheactivitiessuchasreadingnewspaperswatchingTVplayinggamesetc.canimprovepeople’’sscoresonstandardtestsmeasuringrecallofnumbersandnamesexpertssay.Theyalsoacknowledgehoweverthatthereisabigdifferencebetweenplayingchesswithafriendanddoingamentalexercisesuchasmemorizingnumbers.Oneisanorganicpartofaperson’’slifetheotherapurelyintellectualexercisedoneinisolation.Thefirstisfun;thesecondoftenisatiringtask. Asassertedbyresearchersourinabilitytomemorizewordsornamesmainly
AradiativeforcingisanychangeimposedontheEarththataffecttheplanetaryenergybalance.Radiativeforcingsincludechangesingreenhousegasessuchascarbondioxideandozoneaerosolsintheatmospheresolarirradianceandsurfacereflectivity.Aforcingmayresultfromeitheranaturalorananthropogeniccauseorfrombothasinthecaseofatmosphericaerosolconcentrationswhichcanbealteredeitherbyvolcanicactionortheburningoffossilfuels.Radiativeforcingsaretypicallyspecifiedforthepurposeoftheoreticalglobalclimatesimulations.Incontrastradiativefeedbacksareenvironmentalchangesresultingfromclimatechangesandarecalculatedfromscientificobservation.Radiativefeedbacksincludechangesinsuchphenomenaascloudsatmosphericwatervaporsea-icecoverandsnowcover. Theinterplaybetweenforcingsandfeedbackscanbequitecomplex.Forexampleanincreaseintheconcentrationofatmosphericwatervaporincreasessolarirradiancetherebywarmingtheatmosphereandinturnincreasingevaporationandtheconcentrationofatmosphericwatervapor.Arelatedexampleofthiscomplexinterplayalsoshowstheuncertaintyoffutureclimaticchangesassociatedwithforcingsandfeedbacks.ScientistsareunsurehowthereductionofozonewillultimatelyaffectcloudsandinturntheEarthtemperature.Cloudstrapoutgoingcoolingradiationtherebyprovidingawarminginfluence.Howevertheyalsoreflectincomingsolarradiationandthusprovideacoolinginfluence.CurrentsmeasurementsindicatethattheneteffectofcloudsistocooltheEarth.Howeverscientistsdonotknowhowthebalancemightshiftinthefutureascloudformationanddispersionareaffectedbyozonereduction. Contributingtothisuncertaintyisthecomplexityofthemechanismsatworkintheprocessofozonereduction.Theamountofradiationreachingtheearth’’ssurfaceandtheamountofreradiatedradiationthatistrappedbythegreenhouseeffectinfluencetheEarth’’stemperatureinoppositedirections.Bothmechanismsareaffectedbytheverticaldistributionofozone.Alsotherelativeimportanceofthesetwocompetingmechanismsdependsonthealtitudeatwhichozonechangesoccur.InarecentNASA-sponsoredaircraftstudyoftheAntarcticozoneholechlorinemonoxidewasmeasuredatvaryingaltitudes.Themeasurementssuggestthatchlorineplaysagreaterroleandoxidesofnitrogenalesserrolethanpreviouslythoughtinthedestructionofozoneintheloweratmosphere.Thestudyconcludedthatsimultaneoushigh-resolutionmeasurementsatmanydifferentaltitudesonthescaleof0.1kilometerinverticalextentarenecessarytodiagnosetheoperativemechanisms.Thesefindingshavecalledintoquestionconventionalexplanationsforozonereductionwhichfailtoadequatelyaccountforthenewevidence.NASA=NationalAeronauticsandSpaceAdministration国家航空航天局 Theexampleofozonereductionisusedtoshowthe
Therewillbeasteadytrendtowardvegetarianism.Agivenquantityofgroundcanprovideplantfoodformanoritcanprovideplantfoodforanimalswhicharelaterkilledformeat. Inconvertingthetissuesoffoodintothetissuesofthefeederupto90percentisusedforreasonsotherthantissuemaintenanceandgrowth.Thismeansthatonehundredpoundsofplantfoodwillsupporttenpoundsofhumantissue―whileonehundredpoundsofplantfoodwillsupporttenpoundsofanimaltissuewhichwillthensupportonepoundofhumantissue.Inotherwordslanddevotedtoplantfoodwillsupporttentimesasmanyhumanbeingsaslanddevotedtoanimalfood. Itisthisfarmorethanfoodpreferencesorreligiousdirectionsthatforcesovercrowdedpopulationsintovegetarianism.AnditwillbethedirectioninwhichtheUnitedStatesof2001willbemoving―notbypresidentialorderbutthroughtheforceofasteadyriseinmeatpricesascomparedwithotherkindsoffood. Thisinturnwillcomeaboutbecauseourherdswilldecreaseasthefooddemandcausesmoreandmoremeadowtobeturnedtofarmlandandaslandproducingcornandotheranimalfoodisconvertedtoprovidingfooddirectlyforman. Anotherpointisthatitisnotonlyenergythatisinshortsupply.Ashortageofoilmeansashortageofplastics;ashortageofelectricitymeansashortageofaluminium.Wearealsoexperiencingashortageofpaperandmostotherrawmaterials. Thismeansthatforonethingourgenerosityinwrappingbaggingandpackagingwillhavetorecede.Therewillhavetobeatleastapartialreturninsupermarketstotheolddayswheregoodsweresuppliedinbulkandgivenoutinbagstoorder.Itmayevenbecomenecessarytoreturnbagsasweoncereturnedbottlesorpayfornewones. Adeclineinper-capitaenergyusewillmakeitnecessarytoresorttohumanmuscleagainsothatthedeliverymanwillmakeacomebackhispriceaddedtothatofthefoodofcourse.Sinceenergyshortageswillcauseunemploymentinmanysectorsoftheeconomytherewillbeidlehandstodothemanualworkthatwillbecomenecessary. Fromanenergy-savingstandpointitwouldmakefarmoresensetoorderbyphoneandhaveasingletruckdeliverfoodtomanyhomesthanforamemberofeachhometodriveanautomobileround-triptopickupaone-familyfoodsupply. Tobesureitwillnotallberetrogression.EvenassumingthatEarthisinadesperatebattleofsurvivalthroughacrisisofstillrisingpopulationanddwindlingenergyreservesthereshouldstillcontinuetobetechnologicaladvancesinthosedirectionsthatdon’’tdependonwastefulbulkuseofenergy.Therewillbecontinuingadvancesinthedirectionofsophisticationinotherwords. ThephrasewillhavetorecedeinPar.6mostprobablymeans
Atthestartofthe20thcenturyimmigrantlaborandinnovationhelpedturntheU.S.intoapowerfulmanufacturingnation.Todayforeign-bornengineersjamthecorridorsofSiliconValleyhelpingAmerica’’sinformation-technologyboom.Andasthe21stcenturydawnsyetanotherwaveofimmigrantswillonceagainhelptransformtheeconomy. 46DuringthenextdecadeexceptingachangeingovernmentpolicynearlyamillionimmigrantsareexpectedtoarriveintheU.S.everyyearmostofwhombothlegalandillegalwillcontinuetocomefromLatinAmericaandSoutheastAsiabuteveryforeignlandwillberepresented. Asdomesticbirthratesstagnateonlyforeign-bornworkerwillkeepthelaborpoolgrowing.By2006infactimmigrantswillaccountforhalfofallnewU.S.workers;overthenext30yearstheirsharewillriseto60%. 47EvenatcurrentlevelsofimmigrationaccordingtotheLaborDept.thenumberofpeopleavailabletoworkwillincreasebyamere0.8%peryearbetween1996and2006-halftherateofthepreviousdecade.WithoutimmigrantsaccordingtoanewstudytheU.S.workforcewouldactuallybegintoshrinkby2015. 48It’’snotallaboutsheernumbersofcourse:ToliftproductivityandspurgrowthimmigrantsmustprovidecreativityentrepreneurialenergyorsimpleinitiativethatAmericacouldn’’tfindotherwise.IfallyoudidwasbringinpeoplewhoareexactlythesameasthosewehaveheretherewouldbenoeconomicbenefitsaysRandCorp.economistJamesP.SmithYou’’djusthavemorepeople. Justascrucialthearrayofeducationandskillsimmigrantsbringcouldfitneatlywiththesupplyofjobsoverthenextdecade.AccordingtoLindaLevineattheCongressionalResearchService60%ofthejobscreatedthrough2005willrequiresomepost-secondaryeducation.Butsheaddslow-skilljobswillstillrepresentabouthalfoftotalemployment.49Yetimmigrantsalsoare50%morelikelythanAmericanstohaveagraduatedegreeandanunbelievable23%ofU.S.residentsholdingPhDsinscienceandengineeringareforeign-bornaccordingtotheNationalScienceFoundation. Indeedforeign-bornworkershaveshownanextraordinaryabilitytoassimilateandflourish.Certainlysomelessskilledworkerswillremainatthebottomeconomicrungalltheirlives.50Yetotherswillcatchupquicklyandwithinadecadeoftheirarrivalthewell-educatedwillgofrommakingbarelyhalfthatofnative-bornAmericansincomparableworktonearly90%accordingtoarecentstudy. Thatofcoursewillraiseimmigrants’’livingstandards.Moreimportantitwillhelpdriveinnovationandentrepreneurshipkeyenginesofthe21stCenturyEconomy. Atthestartofthe20thcenturyimmigrantlaborandinnovationhelpedturntheU.S.intoapowerfulmanufacturingnation.Todayforeign-bornengineersjamthecorridorsofSiliconValleyhelpingAmerica’’sinformation-technologyboom.Andasthe21stcenturydawnsyetanotherwaveofimmigrantswillonceagainhelptransformtheeconomy. 46DuringthenextdecadeexceptingachangeingovernmentpolicynearlyamillionimmigrantsareexpectedtoarriveintheU.S.everyyearmostofwhombothlegalandillegalwillcontinuetocomefromLatinAmericaandSoutheastAsiabuteveryforeignlandwillberepresented. Asdomesticbirthratesstagnateonlyforeign-bornworkerwillkeepthelaborpoolgrowing.By2006infactimmigrantswillaccountforhalfofallnewU.S.workers;overthenext30yearstheirsharewillriseto60%. 47EvenatcurrentlevelsofimmigrationaccordingtotheLaborDept.thenumberofpeopleavailabletoworkwillincreasebyamere0.8%peryearbetween1996and2006-halftherateofthepreviousdecade.WithoutimmigrantsaccordingtoanewstudytheU.S.workforcewouldactuallybegintoshrinkby2015. 48It’’snotallaboutsheernumbersofcourse:ToliftproductivityandspurgrowthimmigrantsmustprovidecreativityentrepreneurialenergyorsimpleinitiativethatAmericacouldn’’tfindotherwise.IfallyoudidwasbringinpeoplewhoareexactlythesameasthosewehaveheretherewouldbenoeconomicbenefitsaysRandCorp.economistJamesP.SmithYou’’djusthavemorepeople. Justascrucialthearrayofeducationandskillsimmigrantsbringcouldfitneatlywiththesupplyofjobsoverthenextdecade.AccordingtoLindaLevineattheCongressionalResearchService60%ofthejobscreatedthrough2005willrequiresomepost-secondaryeducation.Butsheaddslow-skilljobswillstillrepresentabouthalfoftotalemployment.49Yetimmigrantsalsoare50%morelikelythanAmericanstohaveagraduatedegreeandanunbelievable23%ofU.S.residentsholdingPhDsinscienceandengineeringareforeign-bornaccordingtotheNationalScienceFoundation. Indeedforeign-bornworkershaveshownanextraordinaryabilitytoassimilateandflourish.Certainlysomelessskilledworkerswillremainatthebottomeconomicrungalltheirlives.50Yetotherswillcatchupquicklyandwithinadecadeoftheirarrivalthewell-educatedwillgofrommakingbarelyhalfthatofnative-bornAmericansincomparableworktonearly90%accordingtoarecentstudy. Thatofcoursewillraiseimmigrants’’livingstandards.Moreimportantitwillhelpdriveinnovationandentrepreneurshipkeyenginesofthe21stCenturyEconomy.
SectionⅠUseofEnglishDirections:Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABt2orDonANSWERSHEETI.BlackdeaththatdroveNewtonfromhiscollegeandintoamomentousdiscovery1Englandin1665.Astronomicalrecordsofthetimeshowthat2wasayearofintensesun-spotactivityandstudiesofannualtree3whicharewiderwhenthesunisdisturbed4thattheterribleplagueof1348was5accompaniedbyanactivesun.Thissoundsincredible6wenowhaveevidencethatthesunhasadirecteffectonsomeofourbody7.Over120000testsmadeonpeopleinaBlackSea8tomeasurethenumberoflymphocytesintheirblood.Thesesmallcellsnormally9between20and25percentofman’swhitebloodcellsbutinyearsofgreatsolaractivitythis10decreases.Therewasabiffdropduringthesunspotyearsof1986and1987andnumberofpeople11fromdiseasescausedbyalymphocytedeficiency12doubledduringthetremendoussolarexplosionofFebruary1986.Manyofthebody’s13seemtobeinfluencedbysun-inducedchangesintheearth’smagnetic14.Ifthisissoone15tofindthatthenervoussystemwhichdependsonelectricalstimuliwouldbethemost16.Astudyof5580coal—mineaccidents17theRuhrrivershowsthatmostoccurredonthedayfollowingsolaractivity.StudiesoftrafficaccidentsinRussiaandinGermanyshowthattheseincreasebyasmuchasfour18theaverageondaysafterthe19ofasolarflare.Thissuggeststhataccidentsmaybe20adisturbancedeeperthanasimpledecreaseinreactiontime.Theseresultsmakeitclearthatmanisamongotherthingsaremarkablysensitiveliving.sundial. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCorDonANSWERSHEET1.4
AsAmerica’’sairbecomessteadilymorecontaminatedactivitiesacrossthenationtocopewithsmogappeartobelaggingfurtherandfurtherbehindactualneedsdespitearisingpublicclamorforimprovement. Therehasbeenaconsiderableprogressinthelastcoupleofyears.Buttheover-allpictureisthatsomanylocalitieshaven’’treallycometogripswiththeairpollutionproblemthatpeoplemightbedismayediftheyknewhowtheirwelfarewasbeingtrifledwith. Airpollutionsourcesarenowhurlingmorethan140milliontonsofcontaminantsintotheatmosphereeveryyearbyFederalestimates.Twoyearsagoitwasonly130milliontons. Theincreasehasbeencausedbymanythings--morepeoplemoreautomobilesmoreindustrymorespaceheatinglittleifanyreductionthatmoreoftenthannotareinadequate. Theadversehealtheffectsofairpollutionarebecomingmorewidelyrecognizedalthoughspecificmedicalevidenceisstillfragmentary.Asapsychologicalannoyanceoftencalledanestheticfactorittranslatesintodecreasedpropertyvalues.Indamagetocropsandotherplantsitscostisreckonedinmillionsofdollars;indamagetostructuresandmaterialsinbillions. Federalandstatepollutioncontrolofficialsreportthefollowinghighlightofthecurrentsituation. Statesandlocalitiesgenerallystillhavepenaltiesforairpollutionthatarelittlemorethanawristslapwithfinesaslowas＄10.Enforcementisgenerallysketchyandweak.Andtheremedialproceduresaresocumbersomethatmoreandmoretheyarebeingbypassedbysimplelawsuitsbroughtbypublicofficialsorcitizens. AlthoughFederallawhasrequiredautomakerstoprovidevehicleswithfumecontrolequipmentfewstateshavedoneanythingtoassureitseffectivenessafteracarhasleftthefactorybyprovidingforregularinspectionoftheequipment. Publicofficialsinmanyplacesstillseemtoconsiderburstsofcomplaintsfromcitizenspreferabletocomplaintstheymightgetfrominstitutingeffectiveairqualityprograms.Industriesandotherpolluterssuchasmunicipalitiesstillexertgreatinfluenceopposingorweakeningregulatorylawsandpackingregulatoryboardswiththeirownspokesmen. Publicresentmentoverairpollutionisgrowingasisshownbyrecurringincidentsofpicketing设置纠察员andincreasingnumberoflegalactions. ThebigFederalprogramtocombatairpollutionunderwayforseveralyearsisproceedingfairlyclosetoschedule.ButFederalauto-fumeregulationswillnotbeveryproductivefornearlyadecadeuntilaround100millionunregulatedolder-generationcarshavebeenreplacedonthehighways. ThepartoftheFederaleffortthatdealswithstationarypollutionsourceslikefactoriesisstilllargelyinanorganizationalphaseyieldinglittleimmediatereductioninfumes. Anexampleoftheestheticfactorassociatedwithairpollutionwouldbe
AradiativeforcingisanychangeimposedontheEarththataffecttheplanetaryenergybalance.Radiativeforcingsincludechangesingreenhousegasessuchascarbondioxideandozoneaerosolsintheatmospheresolarirradianceandsurfacereflectivity.Aforcingmayresultfromeitheranaturalorananthropogeniccauseorfrombothasinthecaseofatmosphericaerosolconcentrationswhichcanbealteredeitherbyvolcanicactionortheburningoffossilfuels.Radiativeforcingsaretypicallyspecifiedforthepurposeoftheoreticalglobalclimatesimulations.Incontrastradiativefeedbacksareenvironmentalchangesresultingfromclimatechangesandarecalculatedfromscientificobservation.Radiativefeedbacksincludechangesinsuchphenomenaascloudsatmosphericwatervaporsea-icecoverandsnowcover. Theinterplaybetweenforcingsandfeedbackscanbequitecomplex.Forexampleanincreaseintheconcentrationofatmosphericwatervaporincreasessolarirradiancetherebywarmingtheatmosphereandinturnincreasingevaporationandtheconcentrationofatmosphericwatervapor.Arelatedexampleofthiscomplexinterplayalsoshowstheuncertaintyoffutureclimaticchangesassociatedwithforcingsandfeedbacks.ScientistsareunsurehowthereductionofozonewillultimatelyaffectcloudsandinturntheEarthtemperature.Cloudstrapoutgoingcoolingradiationtherebyprovidingawarminginfluence.Howevertheyalsoreflectincomingsolarradiationandthusprovideacoolinginfluence.CurrentsmeasurementsindicatethattheneteffectofcloudsistocooltheEarth.Howeverscientistsdonotknowhowthebalancemightshiftinthefutureascloudformationanddispersionareaffectedbyozonereduction. Contributingtothisuncertaintyisthecomplexityofthemechanismsatworkintheprocessofozonereduction.Theamountofradiationreachingtheearth’’ssurfaceandtheamountofreradiatedradiationthatistrappedbythegreenhouseeffectinfluencetheEarth’’stemperatureinoppositedirections.Bothmechanismsareaffectedbytheverticaldistributionofozone.Alsotherelativeimportanceofthesetwocompetingmechanismsdependsonthealtitudeatwhichozonechangesoccur.InarecentNASA-sponsoredaircraftstudyoftheAntarcticozoneholechlorinemonoxidewasmeasuredatvaryingaltitudes.Themeasurementssuggestthatchlorineplaysagreaterroleandoxidesofnitrogenalesserrolethanpreviouslythoughtinthedestructionofozoneintheloweratmosphere.Thestudyconcludedthatsimultaneoushigh-resolutionmeasurementsatmanydifferentaltitudesonthescaleof0.1kilometerinverticalextentarenecessarytodiagnosetheoperativemechanisms.Thesefindingshavecalledintoquestionconventionalexplanationsforozonereductionwhichfailtoadequatelyaccountforthenewevidence.NASA=NationalAeronauticsandSpaceAdministration国家航空航天局 Accordingtothetextdecreasedevaporationismostlikelytobringabout
Therewillbeasteadytrendtowardvegetarianism.Agivenquantityofgroundcanprovideplantfoodformanoritcanprovideplantfoodforanimalswhicharelaterkilledformeat. Inconvertingthetissuesoffoodintothetissuesofthefeederupto90percentisusedforreasonsotherthantissuemaintenanceandgrowth.Thismeansthatonehundredpoundsofplantfoodwillsupporttenpoundsofhumantissue―whileonehundredpoundsofplantfoodwillsupporttenpoundsofanimaltissuewhichwillthensupportonepoundofhumantissue.Inotherwordslanddevotedtoplantfoodwillsupporttentimesasmanyhumanbeingsaslanddevotedtoanimalfood. Itisthisfarmorethanfoodpreferencesorreligiousdirectionsthatforcesovercrowdedpopulationsintovegetarianism.AnditwillbethedirectioninwhichtheUnitedStatesof2001willbemoving―notbypresidentialorderbutthroughtheforceofasteadyriseinmeatpricesascomparedwithotherkindsoffood. Thisinturnwillcomeaboutbecauseourherdswilldecreaseasthefooddemandcausesmoreandmoremeadowtobeturnedtofarmlandandaslandproducingcornandotheranimalfoodisconvertedtoprovidingfooddirectlyforman. Anotherpointisthatitisnotonlyenergythatisinshortsupply.Ashortageofoilmeansashortageofplastics;ashortageofelectricitymeansashortageofaluminium.Wearealsoexperiencingashortageofpaperandmostotherrawmaterials. Thismeansthatforonethingourgenerosityinwrappingbaggingandpackagingwillhavetorecede.Therewillhavetobeatleastapartialreturninsupermarketstotheolddayswheregoodsweresuppliedinbulkandgivenoutinbagstoorder.Itmayevenbecomenecessarytoreturnbagsasweoncereturnedbottlesorpayfornewones. Adeclineinper-capitaenergyusewillmakeitnecessarytoresorttohumanmuscleagainsothatthedeliverymanwillmakeacomebackhispriceaddedtothatofthefoodofcourse.Sinceenergyshortageswillcauseunemploymentinmanysectorsoftheeconomytherewillbeidlehandstodothemanualworkthatwillbecomenecessary. Fromanenergy-savingstandpointitwouldmakefarmoresensetoorderbyphoneandhaveasingletruckdeliverfoodtomanyhomesthanforamemberofeachhometodriveanautomobileround-triptopickupaone-familyfoodsupply. Tobesureitwillnotallberetrogression.EvenassumingthatEarthisinadesperatebattleofsurvivalthroughacrisisofstillrisingpopulationanddwindlingenergyreservesthereshouldstillcontinuetobetechnologicaladvancesinthosedirectionsthatdon’’tdependonwastefulbulkuseofenergy.Therewillbecontinuingadvancesinthedirectionofsophisticationinotherwords. .Theauthorseesthepositiveeffectofenergycrisisinits
Maybeit’’sasignofamaturemindwhensomeoflife’’sbiggerquestions-aboutlovefaithambition-suddenlyseemmoremanageablethansmalleronessuchas:WhydidIjustopentherefrigeratorWhereonearthdidIputmykeysWheredidIwritedownthatphonenumber Ourcapacityforstoringandrecallinginformationdoesnotstreamdownlikesandthroughanhourglassasneurologistsoncebelieved.Onthecontrarynewresearchsuggeststhatwhenstimulatedintherightwaybrainsofalmostanyagecangivebirthtocellsandforgefreshpathwaystofileawaynewinformation.Thisemergingpicturehasnotonlyencouragedthosewhotreatandcareforthe5%ofolderadultswhohavedementia痴呆症suchasAlzheimer’’sdiseasebutalsogeneratedawaveofoptimismamongthosestudyingmemorychangesintheother95%aswellasanincreasingpublicfascinationwithmemoryenhancementdietarysupplementsbooksandbrain-improvingtechniques. Theslightfailuresofmemorythatmanyofusattributetoafailingbrainareoftenduetosomethingentirelydifferent:anxietysleepproblemsdepressionevenheartdisease.Thebiologicalnutsandboltsoflearningandmemoryinfactchangelittleovertimeinhealthypeopleresearcherssay.There’’sverylittlecelllossandstructurallyallthemachineryisthereevenverylateinlifesaidaneuroscientistGregCole.It’’sthecells’’speedandabilitytosendandreceivesignalsthatdiminishgraduallywhichiswhatmakesthemindgoblankwhentryingtorecallfamiliarwordsandnames. Formorethanadecaderesearchershaveknownthatpeoplewhohaveactiveintellectuallychallenginglivesarelesslikelytodevelopdementiathanthosewhodonot.Partofthisdifferenceisattributabletointelligencesomedoctorsbelieve:Themoreyoustartwiththelongerittakestoloseit.Andnewevidencesuggeststhattheactofusingyourbrainisinitselfprotectivenomatterwhoyouare. AlloftheactivitiessuchasreadingnewspaperswatchingTVplayinggamesetc.canimprovepeople’’sscoresonstandardtestsmeasuringrecallofnumbersandnamesexpertssay.Theyalsoacknowledgehoweverthatthereisabigdifferencebetweenplayingchesswithafriendanddoingamentalexercisesuchasmemorizingnumbers.Oneisanorganicpartofaperson’’slifetheotherapurelyintellectualexercisedoneinisolation.Thefirstisfun;thesecondoftenisatiringtask. Accordingtothetextadultpersonsusually
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.Theappealoftheworldofworkisfirstitsfreedom.Thechildiscompelledtogotoschool;heisunderthe1ofauthority.Evenwhathe2toschoolmaybedecidedforhim.Ashegrowsuphesees3itistobefree4schoolandtobeabletochoosehisjobandchangeitifhedoesn’’tlikeittohavemoneyinhispocketand5tocomeandgoashewishesintheworld.Theboysandgirlsayearortwoolderthanheiswhomhehaslongobservedrevisitschoolutterly6andapparentlymature.Suddenlymastersandmistressesseem7outofdateashisparentsandtheauthorityofschoola8thing.Atthemomenttheadultworldmayappearsomuchmorerealthantheschoolworld9thehungertoenteritcannotbeappeasedbyexercisesinschoolbooksortalkof10examinationsnecessaryforentryintoprofessionsorthemoreattractiveoccupations.Thismaynotbethewisest11butitisanecessarypartofgrowingupforeveryonemustcomesoonerorlatertothe12ofsayingReallyI’’vehadenoughofbeingtaught;Imustdoaproperjob.Someyouthsmaturingrapidlybecauseofoutsideinfluencescometothisdecision13thantheyought.Yetinawaythisisnotabadframeofmindtobein14leavingschool.Atworktheyoungmanmakesoneofthefirstgreatacceptancesoflife-heacceptsthe15ofthematerialortheprocessheisworkingwith.Thejobmustbedoneinaccordwithsomerigidprocesshecannot16.Heseesthepointofitandindoingsocomesto17withlife.Nothingdoneinschool18itswillinquitethesameway;ifitiswetgamescanbecancelled;ifthemathmasterisillonecan19withsomethingelse.Buteventheboydeliveringpaperslikethedrivertakingouthisbusdiscoversthatonecannot20becausethereissnowonthegroundortheforemanisirritableorhehimselfisinabadmoodthatmorning.
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