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下列不是引起机械性肠梗阻原因的是
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临床上引起肠梗阻的最常见原因是
机械性肠梗阻
动力性肠梗阻
血运性肠梗阻
粘连性肠梗阻
下列哪项不是引起机械性肠梗阻的原因
肿瘤
肠道闭锁
肠管扭转
铅中毒
嵌顿疝
下列有关肠梗阻的叙述中哪一项是错误的
急性肠炎可引起痉挛性肠梗阻
机械性肠梗阻最常见的原因是粘连性肠梗阻
结肠梗阻属于闭袢型梗阻
低位肠梗阻比高位肠梗阻更易引起电解质失衡
麻痹性肠梗阻时疼痛往往不明显
引起机械性肠梗阻的原因有
关于肠梗阻的发病原因下列哪项叙述不正确
肠壁肿瘤可引起机械性肠梗阻
铅中毒可引起动力性肠梗阻
腹膜炎可引起麻痹性肠梗阻
肠扭转可引起绞窄性肠梗阻
肠蛔虫可引起血运性肠梗阻
肠梗阻诊断过程中关键是要确定
是否肠梗阻
是高位还是低位肠梗阻
是何原因引起的肠梗阻
是否绞窄性肠梗阻
是机械性还是动力性肠梗阻
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Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
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IsitpossiblethattheideaswehavetodayaboutownershipandpropertyrightshavebeensouniversalinthehumanmindthatitistrulyasiftheyhadsprungfromthemindofGodBynomeans.Theideaofowningandpropertyemergedinthemistsofunrecordedhistory.TheancientJewsforonehadaverydifferentoutlookonpropertyandownershipviewingitassomethingmuchmoretemporaryandtentativethanwedo. TheideaswehaveinAmericaabouttheprivateownershipofproductivepropertyasanaturalanduniversalrightofmankindperhapsofdivineoriginarebynomeansuniversalandmustbeviewedasaninventionofmanratherthanadecreeorderofGod.Ofcoursewearecompletelytrainedtoaccepttheideaofownershipoftheearthanditsproductsrawandtransformed.Itseemsnotatallstrange;infactitisquitedifficulttoimagineasocietywithoutsucharrangements.Ifsomeonesomeindividualdidn’’townthatplotoflandthathousethatfactorythatmachinethattowerofwheathowwouldwefunctionWhatwouldtherulesbeWhomwouldwebuyfromandhowwouldwesell Itisimportanttoacknowledgeasignificantdifferencebetweenachievingownershipsimplybytakingorclaimingpropertyandowningwhatwetendtocallthefruitoflabor.IfIaloneortogetherwithmyfamilyworkonthelandandraisecropsorifImakesomethingusefuloutofnaturalmaterialitseemsreasonableandfairtoclaimthatthecropsortheobjectsbelongtomeormyfamilyaremypropertyatleastinthesensethatIhavefirstclaimonthem.Hardlyanyonewoulddisputethat.Infactsomeoftheearlyradicalworkingmen’’smovementsmadeanownershipclaimonthoseverygrounds.AsindustrialorganizationbecamemorecomplexhoweversuchissuesbecamevastlymoreintricateItmustbeclearthatinmodernsocietythesocialheritageofknowledgeandtechnologyandthesocialorganizationofmanufactureandexchangeaccountforfarmoreoftheproductivityofindustryandthevalueofwhatisproducedthancanbeaccountedforbythelaborofanynumberofindividuals.HardlyanypersoncannowpointandsayThat--thatrightthere--isthefruitofmylabor.Wecansayasasocietyasanation--asaworldreally--thatwhatisproducedisthefruitofourlabortheproductofthewholesocietyasacollectivity. Wehavetorecognizethattherightofprivateindividualownershipofpropertyisman-madeandconstantlydependentontheextenttowhichthosewithoutpropertybelievethattheownercanmakehisclaimstick. Privateownershipofpropertyisfinallydescribedas
Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
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Theimmunesystemisequalincomplexitytothecombinedintricaciesofthebrainandnervoussystem.Thesuccessoftheimmunesystemindefendingthebodyreliesonadynamicregulatorycommunicationsnetworkconsistingofmillionsandmillionsofcells.Organizedintosetsandsubsetsthesecellspassinformationbackandforthlikecloudsofbeesswarmingaroundahive.Theresultisasensitivesystemofchecksandbalancesthatproducesanimmuneresponsethatispromptappropriateeffectiveandself-limiting. Attheheartoftheimmunesystemistheabilitytodistinguishbetweenselfandnon-self.Whenimmunedefendersencountercellsororganismscarryingforeignornon-selfmoleculestheimmunetroopsmovequicklytoeliminatetheinvaders.Virtuallyeverybodycellcarriesdistinctivemoleculesthatidentifyitasself.Thebody’’simmunedefensesdonotnormallyattacktissuesthatcarryaselfmarker.Ratherimmunecellsandotherbodycellscoexistpeaceablyinastateknownasself-tolerance.Whenanormallyfunctioningimmunesystemattacksanon-selfmoleculethesystemhastheabilitytorememberthespecificsoftheforeignbody.Uponsubsequentencounterswiththesamespeciesofmoleculestheimmunesystemreactsaccordingly.Withthepossibleexceptionofantibodiespassedduringlactation哺乳期thisso-calledimmunesystemmemoryisnotinherited.Despitetheoccurrenceofavirusinyourfamilyyourimmunesystemmustlearnfromexperiencewiththemanymillionsofdistinctivenon-selfmoleculesintheseaofmicrobesinwhichwelive.Learningnecessitatesproducingtheappropriatemoleculesandcellstomatchupwithandcounteracteachnon-selfinvader. Anysubstancecapableofstimulatinganimmuneresponseiscalledanantigen.Tissuesorcellsfromanotherindividualexceptanidenticaltwinwhosecellscarryidenticalself-markersactasantigens;becausetheimmunesystemrecognizestransplantedtissuesasforeignitrejectsthem.Thebodywillevenrejectnourishingproteinsunlesstheyarefirstbrokendownbythedigestivesystemintotheirprimarynon-antigenicbuildingblocks.Anantigenannouncesitsforeignnessbymeansofintricateandcharacteristicshapescalledepitopes抗原决定基whichstickoutfromitssurface.Mostantigenseventhesimplestmicrobescarryseveraldifferentkindsofepitopesontheirsurfacesomemayevencarryseveralhundred.Someepitopeswillbemoreeffectivethanothersatstimulatinganimmuneresponse.Onlyinabnormalsituationsdoestheimmunesystemwronglyidentifyselfasnon-selfandexecuteamisdirectedimmuneattack.Theresultcanbeso-calledautoimmunedisease.Thepainfulsideeffectsofthesediseasesarecausedbyaperson’’simmunesystemactuallyattackingitself Therememberingpowerofaperson’’simmunesystemis
IsitpossiblethattheideaswehavetodayaboutownershipandpropertyrightshavebeensouniversalinthehumanmindthatitistrulyasiftheyhadsprungfromthemindofGodBynomeans.Theideaofowningandpropertyemergedinthemistsofunrecordedhistory.TheancientJewsforonehadaverydifferentoutlookonpropertyandownershipviewingitassomethingmuchmoretemporaryandtentativethanwedo. TheideaswehaveinAmericaabouttheprivateownershipofproductivepropertyasanaturalanduniversalrightofmankindperhapsofdivineoriginarebynomeansuniversalandmustbeviewedasaninventionofmanratherthanadecreeorderofGod.Ofcoursewearecompletelytrainedtoaccepttheideaofownershipoftheearthanditsproductsrawandtransformed.Itseemsnotatallstrange;infactitisquitedifficulttoimagineasocietywithoutsucharrangements.Ifsomeonesomeindividualdidn’’townthatplotoflandthathousethatfactorythatmachinethattowerofwheathowwouldwefunctionWhatwouldtherulesbeWhomwouldwebuyfromandhowwouldwesell Itisimportanttoacknowledgeasignificantdifferencebetweenachievingownershipsimplybytakingorclaimingpropertyandowningwhatwetendtocallthefruitoflabor.IfIaloneortogetherwithmyfamilyworkonthelandandraisecropsorifImakesomethingusefuloutofnaturalmaterialitseemsreasonableandfairtoclaimthatthecropsortheobjectsbelongtomeormyfamilyaremypropertyatleastinthesensethatIhavefirstclaimonthem.Hardlyanyonewoulddisputethat.Infactsomeoftheearlyradicalworkingmen’’smovementsmadeanownershipclaimonthoseverygrounds.AsindustrialorganizationbecamemorecomplexhoweversuchissuesbecamevastlymoreintricateItmustbeclearthatinmodernsocietythesocialheritageofknowledgeandtechnologyandthesocialorganizationofmanufactureandexchangeaccountforfarmoreoftheproductivityofindustryandthevalueofwhatisproducedthancanbeaccountedforbythelaborofanynumberofindividuals.HardlyanypersoncannowpointandsayThat--thatrightthere--isthefruitofmylabor.Wecansayasasocietyasanation--asaworldreally--thatwhatisproducedisthefruitofourlabortheproductofthewholesocietyasacollectivity. Wehavetorecognizethattherightofprivateindividualownershipofpropertyisman-madeandconstantlydependentontheextenttowhichthosewithoutpropertybelievethattheownercanmakehisclaimstick. Onedeservestoclaimonsomeproductonlywhen
Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
Ofallthecomponentsofagoodnight’’ssleepdreamsseemtobeleastwithinourcontrol.Indreamsawindowopensintoaworldwherelogicissuspendedanddeadpeoplespeak.AcenturyagoFreudformulatedhisrevolutionarytheorythatdreamswerethedisguisedshadowsofourunconsciousdesiresandfears;bythelate1970sneurologistshadswitchedtothinkingofthemasjustmentalnoise―therandombyproductsoftheneural-repairworkthatgoesonduringsleep.Nowresearcherssuspectthatdreamsarepartofthemind’’semotionalthermostatregulatingmoodswhilethebrainisoff-line.Andoneleadingauthoritysaysthattheseintenselypowerfulmentaleventscanbenotonlyharnessedbutactuallybroughtunderconsciouscontroltohelpussleepandfeelbetter.It’’syourdreamsaysRosalindCartwrightchairofpsychologyatChicago’’sMedicalCenter.Ifyoudon’’tlikeitchangeit. Evidencefrombrainimagingsupportsthisview.ThebrainisasactiveduringREMrapideyemovementsleep―whenmostvividdreamsoccur―asitiswhenfullyawakesaysDr.EricNofzingerattheUniversityofPittsburgh.Butnotallpartsofthebrainareequallyinvolved;thelimbicsystemtheemotionalbrainisespeciallyactivewhiletheprefrontalcortexthecenterofintellectandreasoningisrelativelyquiet.WewakeupfromdreamshappyordepressedandthosefeelingscanstaywithusalldaysaysStanfordsleepresearcherDr.WilliamDement. ThelinkbetweendreamsandemotionsshowsupamongthepatientsinCartwright’’sclinic.Mostpeopleseemtohavemorebaddreamsearlyinthenightprogressingtowardhappieronesbeforeawakeningsuggestingthattheyareworkingthroughnegativefeelingsgeneratedduringtheday.Becauseourconsciousmindisoccupiedwithdailylifewedon’’talwaysthinkabouttheemotionalsignificanceoftheday’’sevents―untilitappearswebegintodream. Andthisprocessneednotbelefttotheunconscious.Cartwrightbelievesonecanexerciseconsciouscontroloverrecurringbaddreams.Assoonasyouawakenidentifywhatisupsettingaboutthedream.Visualizehowyouwouldlikeittoendinstead;thenexttimeitoccurstrytowakeupjustenoughtocontrolitscourse.Withmuchpracticepeoplecanlearntoliterallydoitintheirsleep. Attheendofthedaythere’’sprobablylittlereasontopayattentiontoourdreamsatallunlesstheykeepusfromsleepingorwewakeupinapanicCartwrightsays.Terrorismeconomicuncertaintiesandgeneralfeelingsofinsecurityhaveincreasedpeople’’sanxiety.Thosesufferingfrompersistentnightmaresshouldseekhelpfromatherapist.Fortherestofusthebrainhasitswaysofworkingthroughbadfeelings.Sleeporratherdream―onitandyou’’llfeelbetterinthemorning. Byreferringtothelimbicsystemtheauthorintendstoshow
Scienceinpracticedependsfarlessontheexperimentsitpreparesthanonthepreparednessofthemindsofthemenwhowatchtheexperiments.SirIsaacNewtonsupposedlydiscoveredgravitythroughthefallofanapple.Appleshadbeenfallinginmanyplacesforcenturiesandthousandsofpeoplehadseenthemfall.ButNewtonforyearshadbeencuriousaboutthecauseoftheorbitalmotionofthemoonandplanets.WhatkepttheminplaceWhydidn’’ttheyfalloutoftheskyThefactthattheapplefelldowntowardtheearthandnotupintothetreeansweredthequestionhehadbeenaskinghimselfaboutthoselargerfruitsoftheheavensthemoonandtheplanets. HowmanymenwouldhaveconsideredthepossibilityofanapplefallingupintothetreeNewtondidbecausehewasnottryingtopredictanything.Hewasjustwondering.Hismindwasreadyfortheunpredictable.Unpredictabilityispartoftheessentialnatureofresearch.Ifyoudon’’thaveunpredictablethingsyoudon’’thaveresearch.Scientiststendtoforgetthiswhenwritingtheircutanddriedreportsforthetechnicaljournalsbuthistoryisfilledwithexamplesofit. Intalkingtosomescientistsparticularlyyoungeronesyoumightgathertheimpressionthattheyfindthescientificmethodasubstituteforimaginativethought.I’’veattendedresearchconferenceswhereascientisthasbeenaskedwhathethinksabouttheadvisabilityofcontinuingacertainexperiment.Thescientisthasfrownedlookedatthegraphsandsaidthedataarestillinconclusive.WeknowthatthemenfromthebudgetofficehavesaidbutwhatdoyouthinkIsitworthwhilegoingonWhatdoyouthinkwemightexpectThescientisthasbeenshockedathavingevenbeenaskedtospeculate. Whatthisamountstoofcourseisthatthescientisthasbecomethevictimofhisownwritings.Hehasputforwardunquestionedclaimssoconsistentlythathenotonlybelievesthemhimselfbuthasconvincedindustrialandbusinessmanagementthattheyaretrue.Ifexperimentsareplannedandcarriedoutaccordingtoplanasfaithfullyasthereportsinthesciencejournalsindicatethenitisperfectlylogicalformanagementtoexpectresearchtoproduceresultsmeasurableindollarsandcents.Itisentirelyreasonableforauditorstobelievethatscientistswhoknowexactlywheretheyaregoingandhowtheywillgetthereshouldnotbedistractedbythenecessityofkeepingoneeyeonthecashregisterwhiletheothereyeisonthemicroscope.Norifregularityandconformitytoastandardpatternareasdesirabletothescientistasthewritingofhispaperswouldappeartoreflectismanagementtobeblamedfordiscriminatingagainsttheoddballsamongresearchersinfavorofmoreconventionalthinkerswhoworkwellwiththeteam. TheauthorwantstoprovewiththeexampleofIsaacNewtonthat____________.
Solarenergyiscalledarenewableresourcebecauseonahumantimescaleitisessentiallyinexhaustibleitisexpectedtolastatleast6.5billionyearswhilethesuncompletesitslifecycle.46Apotentiallyrenewableresourcecanberenewedfairlyrapidlyhourstoseveraldecadesthroughnaturalprocessesexamplesofwhichincludeforesttreesgrasslandgrasseswildanimalsfreshlakeandstreamwatergroundwaterfreshairandfertilesoil. 47OneimportantpotentiallyrenewableresourceforusandotherspeciesisbiologicaldiversityorbiodiversitywhichconsistsofthelifeformsthatcanbestsurvivevarietyofconditionscurrentlyfoundonEarth.Kindsofbiodiversityinclude1geneticdiversityvarietyinthegeneticmakeupamongindividualswithinasinglespecies2speciesdiversityvarietyamongthespeciesoruniqueformsoflifefoundindifferenthabitatsoftheplanetand3ecologicaldiversityvarietyofforestsdesertsgrasslandsstreamslakesoceanswetlandsandotherbiologicalcommunities.48Thisrichvarietyofgenesspeciesandbiologicalcommunitiesgivesusfoodwoodfibersenergyrawmaterialsindustrialchemicalsandmedicines―allofwhichpourhundredsofbillionsofdollarsintotheworldeconomyeachyear.Earth’’svastlist’’oflifeformsandbiologicalcommunitiesalsoprovidesfreerecyclingandpurificationservicesandnaturalpestcontrol. Potentiallyrenewableresourceshowevercanbeexhausted.49Thehighestrateatwhichapotentiallyrenewableresourcecanbeusedindefinitelywithoutreducingitsavailablesupplyiscalleditssustainableyield.Ifaresource’’snaturalreplacementrateisexceededtheavailablesupplybeginstoshrink―aprocessknownasenvironmentaldegradation. Severaltypesofenvironmentaldegradationcanchangepotentiallyrenewableresourcesintononrenewableorunusableresources.IntheUnitedStatesone-fourthofthegroundwaterwithdrawneachyearisnotreplenishedfilledupagain.Between25%and50%oftheworld’’swetlands55%intheU.S.havebeendrainedbuiltuponorseriouslypolluted.Almosthalfoftheworld’’stropicalforestshavebeencleared.Thousandsofwildlifespeciesbecomeextincteachyearmostlybecauseofhumanactivities.Ifhabitatdestructioncontinuesatpresentratesasmanyas1.5millionspeciescoulddisappearoverthenext25years―adrasticlossinvitalEarthcapital.50Theseexampleshelpexplainwhymostenvironmentalscientistsbelievethatoverthenextfewdecadesthedangerofdegradationandexhaustionisgreatestforpotentiallyrenewableresourcesnotnonrenewableresourcesexceptforpetroleumandperhapsafewscarcemineralsforwhichwecan’’tfindeconomicallyandenvironmentallyacceptablesubstitutes.
Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
Ofallthecomponentsofagoodnight’’ssleepdreamsseemtobeleastwithinourcontrol.Indreamsawindowopensintoaworldwherelogicissuspendedanddeadpeoplespeak.AcenturyagoFreudformulatedhisrevolutionarytheorythatdreamswerethedisguisedshadowsofourunconsciousdesiresandfears;bythelate1970sneurologistshadswitchedtothinkingofthemasjustmentalnoise―therandombyproductsoftheneural-repairworkthatgoesonduringsleep.Nowresearcherssuspectthatdreamsarepartofthemind’’semotionalthermostatregulatingmoodswhilethebrainisoff-line.Andoneleadingauthoritysaysthattheseintenselypowerfulmentaleventscanbenotonlyharnessedbutactuallybroughtunderconsciouscontroltohelpussleepandfeelbetter.It’’syourdreamsaysRosalindCartwrightchairofpsychologyatChicago’’sMedicalCenter.Ifyoudon’’tlikeitchangeit. Evidencefrombrainimagingsupportsthisview.ThebrainisasactiveduringREMrapideyemovementsleep―whenmostvividdreamsoccur―asitiswhenfullyawakesaysDr.EricNofzingerattheUniversityofPittsburgh.Butnotallpartsofthebrainareequallyinvolved;thelimbicsystemtheemotionalbrainisespeciallyactivewhiletheprefrontalcortexthecenterofintellectandreasoningisrelativelyquiet.WewakeupfromdreamshappyordepressedandthosefeelingscanstaywithusalldaysaysStanfordsleepresearcherDr.WilliamDement. ThelinkbetweendreamsandemotionsshowsupamongthepatientsinCartwright’’sclinic.Mostpeopleseemtohavemorebaddreamsearlyinthenightprogressingtowardhappieronesbeforeawakeningsuggestingthattheyareworkingthroughnegativefeelingsgeneratedduringtheday.Becauseourconsciousmindisoccupiedwithdailylifewedon’’talwaysthinkabouttheemotionalsignificanceoftheday’’sevents―untilitappearswebegintodream. Andthisprocessneednotbelefttotheunconscious.Cartwrightbelievesonecanexerciseconsciouscontroloverrecurringbaddreams.Assoonasyouawakenidentifywhatisupsettingaboutthedream.Visualizehowyouwouldlikeittoendinstead;thenexttimeitoccurstrytowakeupjustenoughtocontrolitscourse.Withmuchpracticepeoplecanlearntoliterallydoitintheirsleep. Attheendofthedaythere’’sprobablylittlereasontopayattentiontoourdreamsatallunlesstheykeepusfromsleepingorwewakeupinapanicCartwrightsays.Terrorismeconomicuncertaintiesandgeneralfeelingsofinsecurityhaveincreasedpeople’’sanxiety.Thosesufferingfrompersistentnightmaresshouldseekhelpfromatherapist.Fortherestofusthebrainhasitswaysofworkingthroughbadfeelings.Sleeporratherdream―onitandyou’’llfeelbetterinthemorning. Cartwrightseemstosuggestthat
Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
TwomonthsagoyougotajobasaneditorforthemagazineDesigns&Fashions.Butnowyoufindthattheworkisnotwhatyouexpected.Youdecidetoquit.WritealettertoyourbossMr.Wangtellinghimyourdecisionstatingyourreasonsandmakinganapology.Writeyourletterwithnolessthan100words.WriteitneatlyonANSWERSHEET2.Donotsignyourownnameattheendoftheletter;useLiMinginstead.Youdonotneedtowritetheaddress.10points
IsitpossiblethattheideaswehavetodayaboutownershipandpropertyrightshavebeensouniversalinthehumanmindthatitistrulyasiftheyhadsprungfromthemindofGodBynomeans.Theideaofowningandpropertyemergedinthemistsofunrecordedhistory.TheancientJewsforonehadaverydifferentoutlookonpropertyandownershipviewingitassomethingmuchmoretemporaryandtentativethanwedo. TheideaswehaveinAmericaabouttheprivateownershipofproductivepropertyasanaturalanduniversalrightofmankindperhapsofdivineoriginarebynomeansuniversalandmustbeviewedasaninventionofmanratherthanadecreeorderofGod.Ofcoursewearecompletelytrainedtoaccepttheideaofownershipoftheearthanditsproductsrawandtransformed.Itseemsnotatallstrange;infactitisquitedifficulttoimagineasocietywithoutsucharrangements.Ifsomeonesomeindividualdidn’’townthatplotoflandthathousethatfactorythatmachinethattowerofwheathowwouldwefunctionWhatwouldtherulesbeWhomwouldwebuyfromandhowwouldwesell Itisimportanttoacknowledgeasignificantdifferencebetweenachievingownershipsimplybytakingorclaimingpropertyandowningwhatwetendtocallthefruitoflabor.IfIaloneortogetherwithmyfamilyworkonthelandandraisecropsorifImakesomethingusefuloutofnaturalmaterialitseemsreasonableandfairtoclaimthatthecropsortheobjectsbelongtomeormyfamilyaremypropertyatleastinthesensethatIhavefirstclaimonthem.Hardlyanyonewoulddisputethat.Infactsomeoftheearlyradicalworkingmen’’smovementsmadeanownershipclaimonthoseverygrounds.AsindustrialorganizationbecamemorecomplexhoweversuchissuesbecamevastlymoreintricateItmustbeclearthatinmodernsocietythesocialheritageofknowledgeandtechnologyandthesocialorganizationofmanufactureandexchangeaccountforfarmoreoftheproductivityofindustryandthevalueofwhatisproducedthancanbeaccountedforbythelaborofanynumberofindividuals.HardlyanypersoncannowpointandsayThat--thatrightthere--isthefruitofmylabor.Wecansayasasocietyasanation--asaworldreally--thatwhatisproducedisthefruitofourlabortheproductofthewholesocietyasacollectivity. Wehavetorecognizethattherightofprivateindividualownershipofpropertyisman-madeandconstantlydependentontheextenttowhichthosewithoutpropertybelievethattheownercanmakehisclaimstick. Accordingtothetexttheconceptofownershipprobably
Solarenergyiscalledarenewableresourcebecauseonahumantimescaleitisessentiallyinexhaustibleitisexpectedtolastatleast6.5billionyearswhilethesuncompletesitslifecycle.46Apotentiallyrenewableresourcecanberenewedfairlyrapidlyhourstoseveraldecadesthroughnaturalprocessesexamplesofwhichincludeforesttreesgrasslandgrasseswildanimalsfreshlakeandstreamwatergroundwaterfreshairandfertilesoil. 47OneimportantpotentiallyrenewableresourceforusandotherspeciesisbiologicaldiversityorbiodiversitywhichconsistsofthelifeformsthatcanbestsurvivevarietyofconditionscurrentlyfoundonEarth.Kindsofbiodiversityinclude1geneticdiversityvarietyinthegeneticmakeupamongindividualswithinasinglespecies2speciesdiversityvarietyamongthespeciesoruniqueformsoflifefoundindifferenthabitatsoftheplanetand3ecologicaldiversityvarietyofforestsdesertsgrasslandsstreamslakesoceanswetlandsandotherbiologicalcommunities.48Thisrichvarietyofgenesspeciesandbiologicalcommunitiesgivesusfoodwoodfibersenergyrawmaterialsindustrialchemicalsandmedicines―allofwhichpourhundredsofbillionsofdollarsintotheworldeconomyeachyear.Earth’’svastlist’’oflifeformsandbiologicalcommunitiesalsoprovidesfreerecyclingandpurificationservicesandnaturalpestcontrol. Potentiallyrenewableresourceshowevercanbeexhausted.49Thehighestrateatwhichapotentiallyrenewableresourcecanbeusedindefinitelywithoutreducingitsavailablesupplyiscalleditssustainableyield.Ifaresource’’snaturalreplacementrateisexceededtheavailablesupplybeginstoshrink―aprocessknownasenvironmentaldegradation. Severaltypesofenvironmentaldegradationcanchangepotentiallyrenewableresourcesintononrenewableorunusableresources.IntheUnitedStatesone-fourthofthegroundwaterwithdrawneachyearisnotreplenishedfilledupagain.Between25%and50%oftheworld’’swetlands55%intheU.S.havebeendrainedbuiltuponorseriouslypolluted.Almosthalfoftheworld’’stropicalforestshavebeencleared.Thousandsofwildlifespeciesbecomeextincteachyearmostlybecauseofhumanactivities.Ifhabitatdestructioncontinuesatpresentratesasmanyas1.5millionspeciescoulddisappearoverthenext25years―adrasticlossinvitalEarthcapital.50Theseexampleshelpexplainwhymostenvironmentalscientistsbelievethatoverthenextfewdecadesthedangerofdegradationandexhaustionisgreatestforpotentiallyrenewableresourcesnotnonrenewableresourcesexceptforpetroleumandperhapsafewscarcemineralsforwhichwecan’’tfindeconomicallyandenvironmentallyacceptablesubstitutes.
Newsreportsoftenfocusondisputesamongscientistsoverthevalidityofpreliminaryuntesteddatahypothesesandmodelswhichbydefinitionaretentative.Thisaspectofscience-1becauseithasnotbeenwidely2andaccepted-iscalledfrontierscience.Themedia3tofocusonfrontiersciencebecauseitsso-calledbreakthroughsmakegoodnewsstories.Justbecausesomethingisinthe4offrontierscience5doesnotmeanthatitisn’’tworthyofseriousconsideration;6suchmattersneedfurtherstudytodeterminetheir7. 8contrastconsensusscienceconsistsofdatamodelstheoriesandlawsthatarewidelyaccepted.Thisaspectofscienceisveryreliablebutis9considerednewsworthy.Thetroubleisthatthewordscienceisusedto10bothfrontierandconsensussciencewithout11Themediapreference12frontiersciencegivesthepublicthe13impressionthatfrontierscience14verycertainconclusionswhichmayormaynotbecorrect. However15somefrontierscienceislatershowntobeunreliablemembersofthepublicoftenfalsely16thatconsensusscienceisalsoquiteuncertain.Weneedtotakebothfrontierandconsensusscience17butrecognizetheirdifferences.Onewaytofindoutwhatscientistsgenerallyagree18istoseekoutreportsbyscientificbodiesthatattemptto19consensusin20areasofscienceandtechnology.
Studythefollowingpicturecarefullyandwriteanessayinwhichyoushould 1describethepicture 2interpretitsimplicationsinlifeand 3supportyourviewwithexamples. Youshouldwriteabout160-200wordsneatlyonANSWERSHEET2.20points
Theimmunesystemisequalincomplexitytothecombinedintricaciesofthebrainandnervoussystem.Thesuccessoftheimmunesystemindefendingthebodyreliesonadynamicregulatorycommunicationsnetworkconsistingofmillionsandmillionsofcells.Organizedintosetsandsubsetsthesecellspassinformationbackandforthlikecloudsofbeesswarmingaroundahive.Theresultisasensitivesystemofchecksandbalancesthatproducesanimmuneresponsethatispromptappropriateeffectiveandself-limiting. Attheheartoftheimmunesystemistheabilitytodistinguishbetweenselfandnon-self.Whenimmunedefendersencountercellsororganismscarryingforeignornon-selfmoleculestheimmunetroopsmovequicklytoeliminatetheinvaders.Virtuallyeverybodycellcarriesdistinctivemoleculesthatidentifyitasself.Thebody’’simmunedefensesdonotnormallyattacktissuesthatcarryaselfmarker.Ratherimmunecellsandotherbodycellscoexistpeaceablyinastateknownasself-tolerance.Whenanormallyfunctioningimmunesystemattacksanon-selfmoleculethesystemhastheabilitytorememberthespecificsoftheforeignbody.Uponsubsequentencounterswiththesamespeciesofmoleculestheimmunesystemreactsaccordingly.Withthepossibleexceptionofantibodiespassedduringlactation哺乳期thisso-calledimmunesystemmemoryisnotinherited.Despitetheoccurrenceofavirusinyourfamilyyourimmunesystemmustlearnfromexperiencewiththemanymillionsofdistinctivenon-selfmoleculesintheseaofmicrobesinwhichwelive.Learningnecessitatesproducingtheappropriatemoleculesandcellstomatchupwithandcounteracteachnon-selfinvader. Anysubstancecapableofstimulatinganimmuneresponseiscalledanantigen.Tissuesorcellsfromanotherindividualexceptanidenticaltwinwhosecellscarryidenticalself-markersactasantigens;becausetheimmunesystemrecognizestransplantedtissuesasforeignitrejectsthem.Thebodywillevenrejectnourishingproteinsunlesstheyarefirstbrokendownbythedigestivesystemintotheirprimarynon-antigenicbuildingblocks.Anantigenannouncesitsforeignnessbymeansofintricateandcharacteristicshapescalledepitopes抗原决定基whichstickoutfromitssurface.Mostantigenseventhesimplestmicrobescarryseveraldifferentkindsofepitopesontheirsurfacesomemayevencarryseveralhundred.Someepitopeswillbemoreeffectivethanothersatstimulatinganimmuneresponse.Onlyinabnormalsituationsdoestheimmunesystemwronglyidentifyselfasnon-selfandexecuteamisdirectedimmuneattack.Theresultcanbeso-calledautoimmunedisease.Thepainfulsideeffectsofthesediseasesarecausedbyaperson’’simmunesystemactuallyattackingitself Theprincipaltaskoftheimmunesystemisto
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