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? ?阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2～5段每段选择1个正确的小标题；(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每...
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? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为规定段每段选择1
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为规定段每段选择1
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2—5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
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Eatingtoomuchfatcanleadtoheartdiseaseandcausehighbloodpressure.
GlobalWarmingandTechnologicalchanges Recentstudieshaveidentifiedfourmajorglobalenvironmentalrisks:acidrainozonedepletiondeforestationandthegreenhouseeffect.OnthewholethankstotechnologicalchangespeoplenowtendtomovetowardwarmerregionsinNorthAmericaandEurope.ClimatewarmingwillprobablybeaboontoAlaskawhichisAmerica’’sleastproductivestateinGrossNationalProductGNPpersquaremile. StudiesoftheimpactofglobalwarmingontheUnitedStatesandotherdevelopedregionsfindthatthemostvulnerableareasarethosedependentonunmanagedecosystems—onnaturallyoccurringrainfallrun-offandtemperaturesandtheextremesofthesevariables.Agricultureforestryandcoastalactivitiesfallintothiscategory. Mosteconomicactivityinindustrializedcountrieshoweverdependsverylittleontheclimate.Intensive-careunitsofhospitalscommunicationsheavymanufacturingandmicroelectronicsareamongthesectorslikelytobeunaffectedbyclimaticchange.InselectingwhethertosetupinsayHongKongorinWarsawfewbusinesseswillconsidertemperatureaweightyfactor. GreenhousewarmingwouldhavelittleeffectonAmericasnationaloutput.About3%ofAmericanGNPoriginatesinclimatesensitivesectorssuchasfarmingandforestry.Another10%comesfromsectorsonlymodestlysensitive-energywatersystemspropertyandconstruction.Forthelargestshare87%comesfromsectorsincludingmostservicesthatarenegligiblyaffectedbyclimatechange. Inindustrializedcountriesservicesarescarcelyaffectedbyclimatechanges.
OldMothers’ChildrenHaveHigherDiabetes糖尿病Risk Childrenofoldermothersrunahigherriskofdevelopinginsulin-dependent胰岛素依赖型的diabetestheBritishMedicalJournalsaid.Astrongassociationwasfoundbetweenincreasingmaternal母亲的ageatdeliveryandriskofinsulin-dependentdiabetesinthechild.RiskwashighestinfirstbornchildrenanddecreasedprogressivelywithhigherbirthorderProfessorEdwinGaleandcolleaguesatSouthmeadHospitalinBristolsaid.Diabetesisaseriousincurablelifelongdiseasecharacterized以......作为特性byallinabilitytocontroltheamountofsugarintheblood.Insulin-dependentdiabeteswhichmainlyaffectschildrenistreatedbyadministeringthehormoneinsulin.Galelookedinto1375familiesintheOxfordareawhereoneormorechildrenhaddiabetesandfoundthattheriskofachilddevelopinginsulin-dependentdiabetesincreasedby25percentforeachfive-yearbandofthemothersage. Theriskofdevelopingdiabeteswasalsolinkedtotheageofthefather.Foreveryfive-yearbandofthefather’’sagetheriskofthechilddevelopingdiabetesincreasedbyninepercent.Theriskofdiabeteswashigh?estamongthefirstbornchildrenofmotherswhostartedtheirfamilieslateandtheriskdecreasedbyabout15percentforeachsubsequentchildtheBMJsaid.Theolderthemothertheearlierthestartofinsulin-dependentdiabetesinthechild.Otherstudieshavealreadyshownthatchildrenborntooldermothersovertheageof35haveanincreasedriskofdiabetesbutthisstudyisthefirsttoestablishthatriskincreasescontinuouslyinrelationtoincreasingmaternalageDr.PollyBingleyofSouthmeadHospitaltoldReuters路透社.Thenewstudyisthefirsttoshowthatriskisrelatedtobirthorder. Thestudyalsopartlyexplainsincreasingdiabetes.Between1970and1996theproportionofchildrenborntomothersagedbetween30and34increasedto28percentfrom15percentandthiscouldaccountforrisingnumbersofchildhooddiabetespatientsthescientistssaidinthealarmingincreaseintherateofinsulin-dependentdiabetesamongchildreninrecentyears.Thisstudymaywellprovideacluetotheunderstandingofthisproblem.ItismostlikelythatthereareanumberoffactorstoexplaintheincreaseDiabetesUKsaid.Therearesome1.4milliondiagnoseddiabetessufferersinBritainthecharityDiabetesUKsaid.Ofthese1.4millionsufferersthereare20000peopleunderage20whosufferfrominsulin-dependentdiabetes. HowmanydiagnoseddiabetespatientsarethereinBritain?
GlobalWarmingandTechnologicalchanges Recentstudieshaveidentifiedfourmajorglobalenvironmentalrisks:acidrainozonedepletiondeforestationandthegreenhouseeffect.OnthewholethankstotechnologicalchangespeoplenowtendtomovetowardwarmerregionsinNorthAmericaandEurope.ClimatewarmingwillprobablybeaboontoAlaskawhichisAmerica’’sleastproductivestateinGrossNationalProductGNPpersquaremile. StudiesoftheimpactofglobalwarmingontheUnitedStatesandotherdevelopedregionsfindthatthemostvulnerableareasarethosedependentonunmanagedecosystems—onnaturallyoccurringrainfallrun-offandtemperaturesandtheextremesofthesevariables.Agricultureforestryandcoastalactivitiesfallintothiscategory. Mosteconomicactivityinindustrializedcountrieshoweverdependsverylittleontheclimate.Intensive-careunitsofhospitalscommunicationsheavymanufacturingandmicroelectronicsareamongthesectorslikelytobeunaffectedbyclimaticchange.InselectingwhethertosetupinsayHongKongorinWarsawfewbusinesseswillconsidertemperatureaweightyfactor. GreenhousewarmingwouldhavelittleeffectonAmericasnationaloutput.About3%ofAmericanGNPoriginatesinclimatesensitivesectorssuchasfarmingandforestry.Another10%comesfromsectorsonlymodestlysensitive-energywatersystemspropertyandconstruction.Forthelargestshare87%comesfromsectorsincludingmostservicesthatarenegligiblyaffectedbyclimatechange. Thearticleistalkingabouttheacidrain.
Cometsarestillregardedwithfrightbysomepeople.
GlobalWarmingandTechnologicalchanges Recentstudieshaveidentifiedfourmajorglobalenvironmentalrisks:acidrainozonedepletiondeforestationandthegreenhouseeffect.OnthewholethankstotechnologicalchangespeoplenowtendtomovetowardwarmerregionsinNorthAmericaandEurope.ClimatewarmingwillprobablybeaboontoAlaskawhichisAmerica’’sleastproductivestateinGrossNationalProductGNPpersquaremile. StudiesoftheimpactofglobalwarmingontheUnitedStatesandotherdevelopedregionsfindthatthemostvulnerableareasarethosedependentonunmanagedecosystems—onnaturallyoccurringrainfallrun-offandtemperaturesandtheextremesofthesevariables.Agricultureforestryandcoastalactivitiesfallintothiscategory. Mosteconomicactivityinindustrializedcountrieshoweverdependsverylittleontheclimate.Intensive-careunitsofhospitalscommunicationsheavymanufacturingandmicroelectronicsareamongthesectorslikelytobeunaffectedbyclimaticchange.InselectingwhethertosetupinsayHongKongorinWarsawfewbusinesseswillconsidertemperatureaweightyfactor. GreenhousewarmingwouldhavelittleeffectonAmericasnationaloutput.About3%ofAmericanGNPoriginatesinclimatesensitivesectorssuchasfarmingandforestry.Another10%comesfromsectorsonlymodestlysensitive-energywatersystemspropertyandconstruction.Forthelargestshare87%comesfromsectorsincludingmostservicesthatarenegligiblyaffectedbyclimatechange. Climatechangesplayanimportantpartincommunications.
OldMothers’ChildrenHaveHigherDiabetes糖尿病Risk Childrenofoldermothersrunahigherriskofdevelopinginsulin-dependent胰岛素依赖型的diabetestheBritishMedicalJournalsaid.Astrongassociationwasfoundbetweenincreasingmaternal母亲的ageatdeliveryandriskofinsulin-dependentdiabetesinthechild.RiskwashighestinfirstbornchildrenanddecreasedprogressivelywithhigherbirthorderProfessorEdwinGaleandcolleaguesatSouthmeadHospitalinBristolsaid.Diabetesisaseriousincurablelifelongdiseasecharacterized以......作为特性byallinabilitytocontroltheamountofsugarintheblood.Insulin-dependentdiabeteswhichmainlyaffectschildrenistreatedbyadministeringthehormoneinsulin.Galelookedinto1375familiesintheOxfordareawhereoneormorechildrenhaddiabetesandfoundthattheriskofachilddevelopinginsulin-dependentdiabetesincreasedby25percentforeachfive-yearbandofthemothersage. Theriskofdevelopingdiabeteswasalsolinkedtotheageofthefather.Foreveryfive-yearbandofthefather’’sagetheriskofthechilddevelopingdiabetesincreasedbyninepercent.Theriskofdiabeteswashigh?estamongthefirstbornchildrenofmotherswhostartedtheirfamilieslateandtheriskdecreasedbyabout15percentforeachsubsequentchildtheBMJsaid.Theolderthemothertheearlierthestartofinsulin-dependentdiabetesinthechild.Otherstudieshavealreadyshownthatchildrenborntooldermothersovertheageof35haveanincreasedriskofdiabetesbutthisstudyisthefirsttoestablishthatriskincreasescontinuouslyinrelationtoincreasingmaternalageDr.PollyBingleyofSouthmeadHospitaltoldReuters路透社.Thenewstudyisthefirsttoshowthatriskisrelatedtobirthorder. Thestudyalsopartlyexplainsincreasingdiabetes.Between1970and1996theproportionofchildrenborntomothersagedbetween30and34increasedto28percentfrom15percentandthiscouldaccountforrisingnumbersofchildhooddiabetespatientsthescientistssaidinthealarmingincreaseintherateofinsulin-dependentdiabetesamongchildreninrecentyears.Thisstudymaywellprovideacluetotheunderstandingofthisproblem.ItismostlikelythatthereareanumberoffactorstoexplaintheincreaseDiabetesUKsaid.Therearesome1.4milliondiagnoseddiabetessufferersinBritainthecharityDiabetesUKsaid.Ofthese1.4millionsufferersthereare20000peopleunderage20whosufferfrominsulin-dependentdiabetes. Whatisthecorrelationbetweenthemother’sageandthetimewhenthechilddevelopsinsulin-dependentdiabetes?
AmericansDecrease IncreasinglyhistoriansareblamingdiseasesimportedfromtheOldWorldforthestaggeringdisparity不同betweentheindigenous本土的populationofAmericain1492—newestimatesofwhichsoarashighas100millionorapproximatelyone-sixthofthehumanraceatthattime—andthefewmillionfull-bloodedNativeAmericansaliveattheendofthenineteenthcentury.Thereisnodoubtthatchronicdiseasewasanimportantfactorintheprecipitous险峻的declineanditishighlyprobablethatthegreatestkillerwasepidemicdiseaseespeciallyasmanifestedinvirgin-soil处女地epidemics. Virgin-soilepidemicsarethoseinwhichthepopulationsatriskhavehadnopreviouscontactwiththediseasesthatstrikethemandarethereforeimmunologically免疫学的almostdefenseless.Thatvirgin-soilepidemicswereimportantinAmericanhistoryisstronglyindicatedbyevidencethatanumberofdangerousmaladies病—smallpoxmeasles麻疹malaria疟病yellowfeverandundoubtedlyseveralmore—wereunknowninthepre-ColumbianNewWorld.TheeffectsoftheirsuddenintroductionaredemonstratedintheearlychroniclesofAmericawhichcontainreportsofhorrendous可怕的epidemicsandsteeppopulationdeclinesconfirmedinmanycasesbyrecentequantitativeanalysesofSpanishtributerecordsandothersources.TheevidenceprovidedbythedocumentsofBritishandFrenchcoloniesisnotasdefinitivebecausetheconquerorsofthoseareasdidnotestablishpermanentsettlementsandbegintokeepcontinuousrecordsuntiltheseventiethcenturybywhichtimetheworstepidemicshadprobablyalreadytakenplace.FurthermoretheBritishtendedtodrivethenativepopulationsawayratherthanenslavingthemastheSpaniardsdidsothattheepidemicsofBritishAmericaoccurredbeyondtherangeofcolonistsdirectobservation. EvensothesurvivingrecordsofNorthAmericadocontainreferencestodeadlyepidemicsamongtheindigenouspopulation.In1616—1619anepidemicpossiblyofbubonicorpneumonic肺的plague瘟疫sweptcoastalNewEnglandkillingasmanyasnineoutoften.Duringthe1630’’ssmall-poxthediseasemostfataltotheNativeAmericanpeopleeliminatedhalfthepopulationoftheHuronandIroquoisconfederations.Inthe1820’’sfeverdevastatedthepeopleoftheCoulumbiaRiverareakillingeightoutoftenofthem. UnfortunatelythedocumentationoftheseandotherepidemicsisslightandfrequentlyunreliableanditisnecessarytosupplementwhatlittlewedoknowwithevidencefromrecentepidemicsamongNativeAmericans.Forexamplein1952anoutbreakofmeaslesamongtheNativeAmericaninhabitantsofUngavaBay.Quebecaffected99percentofthepopulationandkilled7percenteventhoughsomehadthebenefitofmodernmedicine.Casessuchasthisdemonstratethatevendiseasesthatarenotnormallyfatalcanhavedevastatingconsequenceswhentheystrikeanimmunologicallydefenselesscommunity. Accordingtothepassagevirgin-soilepidemicscanbedistinguishedfromothercatastrophicoutbreaksofdiseaseinthatvirgin-soilepidemics______.
OneGoodReasontoLetSmallpoxLive It’’snowafairbetthatwewillneverseethetotalextinctionofthesmallpoxvirus.Theideawastocapthegloriousachievementof1980whensmallpoxwaseradicatedinthewildbydestroyingthekillervirusinthelasttwolabsthataresupposedtohaveit—oneintheUSandoneinRussia.Ifsmallpoxhadtrulygonefromtheplanetwhatpointwasthereinkeepingthesereserves? 【51】realityofcourseitwasnaiveto【52】thateveryonewouldlet【53】ofsuchapotentpotentialweapon.Undoubtedlyseveralnationsstillhave【54】vials.【55】thelastofficialstocksoflivevirusbredmistrustoftheUSandRussia【56】noobviousgain. NowAmericanresearchershave【57】ananimalmodelofthehumandiseaseopeningthe【58】fortestsonnewtreatmentsandvaccines.Soonceagainthere’’sagoodreasonto【59】thevirus—justin【60】thediseaseputsinareappearance. Howdowe【61】withthemistrustoftheUSandRussia?【62】.Keepthevirus【63】internationalauspicesinawell-guardedUNlaboratorythat’’sopentoallcountries.TheUSwillobjectofcoursejustasitrejectsamultilateralapproachtojustabouteverything.Butitdoesn’’t【64】theideaiswrong.Ifthevirus【65】usefulthenlet’’smakeittheservantofallhumanity——notjustapartofit. smallpoxn.天花 vialn.小瓶 auspicesn.赞助支持 capvt.结束覆盖 potentadj.有效力的强有力的 mistrustn.不信任怀疑
AdaptationofLivingThings Certainanimalsandplantsdevelopcharacteristicsthathelpthemcopewiththeirenvironmentbetterthanothersoftheirkind.Thisnaturalbiologicalprocessiscalledadaptation.Amongthesuperiorcharacteristicsdevelopedthroughadaptationarethosethatmayhelpingettingfoodorshelterinprovidingprotectionandinproducingandprotectingtheyoung.Thatresultsintheevolutionofmoreandmoreorganismsthatarebetterfittedtotheirenvironments. Eachlivingthingisadaptedtoitswayoflifeinageneralwaybuteachisadaptedespeciallytoitsowndistinctclass.Aplantforexampledependsuponitsrootstofixitselffirmlyandtoabsorbwaterandinorganicchemicals.Itdependsuponitsgreenleavesforusingthesun’’senergytomakefoodfrominorganicchemicals.Thesearegeneraladaptationscommontomostplants.Inadditiontherearespecialadaptationsthatonlycertainkindsofplantshave. Manyanimalshaveadaptationsthathelpthemescapefromtheirenemies.Someinsectsarehiddenbytheirbodycolororshapeandmanylooklikealeaforalittlebranch.Thecoatsofdeerarecoloredtomixwiththesurroundings.Manyanimalshavetheabilitytoremaincompletelystillwhenanenemyisnear. Organismshaveagreatvarietyofwaysofadapting.Theymayadaptintheirstructurefunctionandgenetics;intheirdevelopmentandproductionoftheyoung;andinotherrespects.Anorganismmaycreateitswonenvironmentasdowarm-bloodedmammalswhichhavetheabilitytoadjustbodyheatexactlytomaintaintheiridealtemperaturedespitechangingweather.Usuallyadaptationsareanadvantagebutsometimesanorganismissowelladaptedtoaparticularenvironmentthatifconditionschangeitfindsitdifficultorimpossibletoreadapttothenewconditions. Whichofthefollowingisnotdirectlymentioned?
Allforeigntroopsmustwithdrawfromthecountry.
Abarehillappearsbehindthejungle.
OneGoodReasontoLetSmallpoxLive It’’snowafairbetthatwewillneverseethetotalextinctionofthesmallpoxvirus.Theideawastocapthegloriousachievementof1980whensmallpoxwaseradicatedinthewildbydestroyingthekillervirusinthelasttwolabsthataresupposedtohaveit—oneintheUSandoneinRussia.Ifsmallpoxhadtrulygonefromtheplanetwhatpointwasthereinkeepingthesereserves? 【51】realityofcourseitwasnaiveto【52】thateveryonewouldlet【53】ofsuchapotentpotentialweapon.Undoubtedlyseveralnationsstillhave【54】vials.【55】thelastofficialstocksoflivevirusbredmistrustoftheUSandRussia【56】noobviousgain. NowAmericanresearchershave【57】ananimalmodelofthehumandiseaseopeningthe【58】fortestsonnewtreatmentsandvaccines.Soonceagainthere’’sagoodreasonto【59】thevirus—justin【60】thediseaseputsinareappearance. Howdowe【61】withthemistrustoftheUSandRussia?【62】.Keepthevirus【63】internationalauspicesinawell-guardedUNlaboratorythat’’sopentoallcountries.TheUSwillobjectofcoursejustasitrejectsamultilateralapproachtojustabouteverything.Butitdoesn’’t【64】theideaiswrong.Ifthevirus【65】usefulthenlet’’smakeittheservantofallhumanity——notjustapartofit. smallpoxn.天花 vialn.小瓶 auspicesn.赞助支持 capvt.结束覆盖 potentadj.有效力的强有力的 mistrustn.不信任怀疑
DonthesitatetoletmeknowifthereisanythingIcandoforyou.
OldMothers’ChildrenHaveHigherDiabetes糖尿病Risk Childrenofoldermothersrunahigherriskofdevelopinginsulin-dependent胰岛素依赖型的diabetestheBritishMedicalJournalsaid.Astrongassociationwasfoundbetweenincreasingmaternal母亲的ageatdeliveryandriskofinsulin-dependentdiabetesinthechild.RiskwashighestinfirstbornchildrenanddecreasedprogressivelywithhigherbirthorderProfessorEdwinGaleandcolleaguesatSouthmeadHospitalinBristolsaid.Diabetesisaseriousincurablelifelongdiseasecharacterized以......作为特性byallinabilitytocontroltheamountofsugarintheblood.Insulin-dependentdiabeteswhichmainlyaffectschildrenistreatedbyadministeringthehormoneinsulin.Galelookedinto1375familiesintheOxfordareawhereoneormorechildrenhaddiabetesandfoundthattheriskofachilddevelopinginsulin-dependentdiabetesincreasedby25percentforeachfive-yearbandofthemothersage. Theriskofdevelopingdiabeteswasalsolinkedtotheageofthefather.Foreveryfive-yearbandofthefather’’sagetheriskofthechilddevelopingdiabetesincreasedbyninepercent.Theriskofdiabeteswashigh?estamongthefirstbornchildrenofmotherswhostartedtheirfamilieslateandtheriskdecreasedbyabout15percentforeachsubsequentchildtheBMJsaid.Theolderthemothertheearlierthestartofinsulin-dependentdiabetesinthechild.Otherstudieshavealreadyshownthatchildrenborntooldermothersovertheageof35haveanincreasedriskofdiabetesbutthisstudyisthefirsttoestablishthatriskincreasescontinuouslyinrelationtoincreasingmaternalageDr.PollyBingleyofSouthmeadHospitaltoldReuters路透社.Thenewstudyisthefirsttoshowthatriskisrelatedtobirthorder. Thestudyalsopartlyexplainsincreasingdiabetes.Between1970and1996theproportionofchildrenborntomothersagedbetween30and34increasedto28percentfrom15percentandthiscouldaccountforrisingnumbersofchildhooddiabetespatientsthescientistssaidinthealarmingincreaseintherateofinsulin-dependentdiabetesamongchildreninrecentyears.Thisstudymaywellprovideacluetotheunderstandingofthisproblem.ItismostlikelythatthereareanumberoffactorstoexplaintheincreaseDiabetesUKsaid.Therearesome1.4milliondiagnoseddiabetessufferersinBritainthecharityDiabetesUKsaid.Ofthese1.4millionsufferersthereare20000peopleunderage20whosufferfrominsulin-dependentdiabetes. Accordingtothepassagetheriskofachilddevelopinginsulin-dependentdiabetesislinkedtoallthefollowingfactorsEXCEPT______.
Itisoddthatsolittleisknownaboutthetalentedpainter.
OneGoodReasontoLetSmallpoxLive It’’snowafairbetthatwewillneverseethetotalextinctionofthesmallpoxvirus.Theideawastocapthegloriousachievementof1980whensmallpoxwaseradicatedinthewildbydestroyingthekillervirusinthelasttwolabsthataresupposedtohaveit—oneintheUSandoneinRussia.Ifsmallpoxhadtrulygonefromtheplanetwhatpointwasthereinkeepingthesereserves? 【51】realityofcourseitwasnaiveto【52】thateveryonewouldlet【53】ofsuchapotentpotentialweapon.Undoubtedlyseveralnationsstillhave【54】vials.【55】thelastofficialstocksoflivevirusbredmistrustoftheUSandRussia【56】noobviousgain. NowAmericanresearchershave【57】ananimalmodelofthehumandiseaseopeningthe【58】fortestsonnewtreatmentsandvaccines.Soonceagainthere’’sagoodreasonto【59】thevirus—justin【60】thediseaseputsinareappearance. Howdowe【61】withthemistrustoftheUSandRussia?【62】.Keepthevirus【63】internationalauspicesinawell-guardedUNlaboratorythat’’sopentoallcountries.TheUSwillobjectofcoursejustasitrejectsamultilateralapproachtojustabouteverything.Butitdoesn’’t【64】theideaiswrong.Ifthevirus【65】usefulthenlet’’smakeittheservantofallhumanity——notjustapartofit. smallpoxn.天花 vialn.小瓶 auspicesn.赞助支持 capvt.结束覆盖 potentadj.有效力的强有力的 mistrustn.不信任怀疑
AmericansDecrease IncreasinglyhistoriansareblamingdiseasesimportedfromtheOldWorldforthestaggeringdisparity不同betweentheindigenous本土的populationofAmericain1492—newestimatesofwhichsoarashighas100millionorapproximatelyone-sixthofthehumanraceatthattime—andthefewmillionfull-bloodedNativeAmericansaliveattheendofthenineteenthcentury.Thereisnodoubtthatchronicdiseasewasanimportantfactorintheprecipitous险峻的declineanditishighlyprobablethatthegreatestkillerwasepidemicdiseaseespeciallyasmanifestedinvirgin-soil处女地epidemics. Virgin-soilepidemicsarethoseinwhichthepopulationsatriskhavehadnopreviouscontactwiththediseasesthatstrikethemandarethereforeimmunologically免疫学的almostdefenseless.Thatvirgin-soilepidemicswereimportantinAmericanhistoryisstronglyindicatedbyevidencethatanumberofdangerousmaladies病—smallpoxmeasles麻疹malaria疟病yellowfeverandundoubtedlyseveralmore—wereunknowninthepre-ColumbianNewWorld.TheeffectsoftheirsuddenintroductionaredemonstratedintheearlychroniclesofAmericawhichcontainreportsofhorrendous可怕的epidemicsandsteeppopulationdeclinesconfirmedinmanycasesbyrecentequantitativeanalysesofSpanishtributerecordsandothersources.TheevidenceprovidedbythedocumentsofBritishandFrenchcoloniesisnotasdefinitivebecausetheconquerorsofthoseareasdidnotestablishpermanentsettlementsandbegintokeepcontinuousrecordsuntiltheseventiethcenturybywhichtimetheworstepidemicshadprobablyalreadytakenplace.FurthermoretheBritishtendedtodrivethenativepopulationsawayratherthanenslavingthemastheSpaniardsdidsothattheepidemicsofBritishAmericaoccurredbeyondtherangeofcolonistsdirectobservation. EvensothesurvivingrecordsofNorthAmericadocontainreferencestodeadlyepidemicsamongtheindigenouspopulation.In1616—1619anepidemicpossiblyofbubonicorpneumonic肺的plague瘟疫sweptcoastalNewEnglandkillingasmanyasnineoutoften.Duringthe1630’’ssmall-poxthediseasemostfataltotheNativeAmericanpeopleeliminatedhalfthepopulationoftheHuronandIroquoisconfederations.Inthe1820’’sfeverdevastatedthepeopleoftheCoulumbiaRiverareakillingeightoutoftenofthem. UnfortunatelythedocumentationoftheseandotherepidemicsisslightandfrequentlyunreliableanditisnecessarytosupplementwhatlittlewedoknowwithevidencefromrecentepidemicsamongNativeAmericans.Forexamplein1952anoutbreakofmeaslesamongtheNativeAmericaninhabitantsofUngavaBay.Quebecaffected99percentofthepopulationandkilled7percenteventhoughsomehadthebenefitofmodernmedicine.Casessuchasthisdemonstratethatevendiseasesthatarenotnormallyfatalcanhavedevastatingconsequenceswhentheystrikeanimmunologicallydefenselesscommunity. Theauthorimplieswhichofthefollowingstatementsaboutmeasles?
ThefirsttalksbetweenChinaandtheUnitedStateswerethebaseofthelateragreement.
AdaptationofLivingThings Certainanimalsandplantsdevelopcharacteristicsthathelpthemcopewiththeirenvironmentbetterthanothersoftheirkind.Thisnaturalbiologicalprocessiscalledadaptation.Amongthesuperiorcharacteristicsdevelopedthroughadaptationarethosethatmayhelpingettingfoodorshelterinprovidingprotectionandinproducingandprotectingtheyoung.Thatresultsintheevolutionofmoreandmoreorganismsthatarebetterfittedtotheirenvironments. Eachlivingthingisadaptedtoitswayoflifeinageneralwaybuteachisadaptedespeciallytoitsowndistinctclass.Aplantforexampledependsuponitsrootstofixitselffirmlyandtoabsorbwaterandinorganicchemicals.Itdependsuponitsgreenleavesforusingthesun’’senergytomakefoodfrominorganicchemicals.Thesearegeneraladaptationscommontomostplants.Inadditiontherearespecialadaptationsthatonlycertainkindsofplantshave. Manyanimalshaveadaptationsthathelpthemescapefromtheirenemies.Someinsectsarehiddenbytheirbodycolororshapeandmanylooklikealeaforalittlebranch.Thecoatsofdeerarecoloredtomixwiththesurroundings.Manyanimalshavetheabilitytoremaincompletelystillwhenanenemyisnear. Organismshaveagreatvarietyofwaysofadapting.Theymayadaptintheirstructurefunctionandgenetics;intheirdevelopmentandproductionoftheyoung;andinotherrespects.Anorganismmaycreateitswonenvironmentasdowarm-bloodedmammalswhichhavetheabilitytoadjustbodyheatexactlytomaintaintheiridealtemperaturedespitechangingweather.Usuallyadaptationsareanadvantagebutsometimesanorganismissowelladaptedtoaparticularenvironmentthatifconditionschangeitfindsitdifficultorimpossibletoreadapttothenewconditions. Inthefirstparagraphthewordenvironmentscouldbestbereplacedby______.
GlobalWarmingandTechnologicalchanges Recentstudieshaveidentifiedfourmajorglobalenvironmentalrisks:acidrainozonedepletiondeforestationandthegreenhouseeffect.OnthewholethankstotechnologicalchangespeoplenowtendtomovetowardwarmerregionsinNorthAmericaandEurope.ClimatewarmingwillprobablybeaboontoAlaskawhichisAmerica’’sleastproductivestateinGrossNationalProductGNPpersquaremile. StudiesoftheimpactofglobalwarmingontheUnitedStatesandotherdevelopedregionsfindthatthemostvulnerableareasarethosedependentonunmanagedecosystems—onnaturallyoccurringrainfallrun-offandtemperaturesandtheextremesofthesevariables.Agricultureforestryandcoastalactivitiesfallintothiscategory. Mosteconomicactivityinindustrializedcountrieshoweverdependsverylittleontheclimate.Intensive-careunitsofhospitalscommunicationsheavymanufacturingandmicroelectronicsareamongthesectorslikelytobeunaffectedbyclimaticchange.InselectingwhethertosetupinsayHongKongorinWarsawfewbusinesseswillconsidertemperatureaweightyfactor. GreenhousewarmingwouldhavelittleeffectonAmericasnationaloutput.About3%ofAmericanGNPoriginatesinclimatesensitivesectorssuchasfarmingandforestry.Another10%comesfromsectorsonlymodestlysensitive-energywatersystemspropertyandconstruction.Forthelargestshare87%comesfromsectorsincludingmostservicesthatarenegligiblyaffectedbyclimatechange. Farmingmustconsiderclimateanasimportantfactor.
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