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ProfessorClarkcontinuedhisresearchworkanddisregardedhiscolleague’’sadvice.
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. Itcanbeinferredfromthispassagethatthefeathersofabirdcarecolored______.
Thesun{{U}}vanished{{/U}}behindacloud.
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
Neoclassicalgrowththeory{{U}}predicts{{/U}}absoluteconvergenceforeconomieswithequalratesofsavingsandpopulationgrowthandwithaccesstothesanetechnology.
Wecan{{U}}utilize{{/U}}waterforproducingelectricpower.
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
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
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
GlobalWarmingandTechnologicalchanges Recentstudieshaveidentifiedfourmajorglobalenvironmentalrisks:acidrainozonedepletiondeforestationandthegreenhouseeffect.OnthewholethankstotechnologicalchangespeoplenowtendtomovetowardwarmerregionsinNorthAmericaandEurope.ClimatewarmingwillprobablybeaboontoAlaskawhichisAmerica’’sleastproductivestateinGrossNationalProductGNPpersquaremile. StudiesoftheimpactofglobalwarmingontheUnitedStatesandotherdevelopedregionsfindthatthemostvulnerableareasarethosedependentonunmanagedecosystems—onnaturallyoccurringrainfallrun-offandtemperaturesandtheextremesofthesevariables.Agricultureforestryandcoastalactivitiesfallintothiscategory. Mosteconomicactivityinindustrializedcountrieshoweverdependsverylittleontheclimate.Intensive-careunitsofhospitalscommunicationsheavymanufacturingandmicroelectronicsareamongthesectorslikelytobeunaffectedbyclimaticchange.InselectingwhethertosetupinsayHongKongorinWarsawfewbusinesseswillconsidertemperatureaweightyfactor. GreenhousewarmingwouldhavelittleeffectonAmericasnationaloutput.About3%ofAmericanGNPoriginatesinclimatesensitivesectorssuchasfarmingandforestry.Another10%comesfromsectorsonlymodestlysensitive-energywatersystemspropertyandconstruction.Forthelargestshare87%comesfromsectorsincludingmostservicesthatarenegligiblyaffectedbyclimatechange. ClimatewarmingwillprobablynotbeablessingtoAlaska.
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
Thefulleconomy{{U}}round-trip{{/U}}is＄273.
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. Whatkindofchildmaybeatthehighestriskofdevelopinginsulin-dependentdiabetes?
Beingcolleaguesfortenyearstheyhavebecomeintimatefriends.
AdaptationofLivingThings Certainanimalsandplantsdevelopcharacteristicsthathelpthemcopewiththeirenvironmentbetterthanothersoftheirkind.Thisnaturalbiologicalprocessiscalledadaptation.Amongthesuperiorcharacteristicsdevelopedthroughadaptationarethosethatmayhelpingettingfoodorshelterinprovidingprotectionandinproducingandprotectingtheyoung.Thatresultsintheevolutionofmoreandmoreorganismsthatarebetterfittedtotheirenvironments. Eachlivingthingisadaptedtoitswayoflifeinageneralwaybuteachisadaptedespeciallytoitsowndistinctclass.Aplantforexampledependsuponitsrootstofixitselffirmlyandtoabsorbwaterandinorganicchemicals.Itdependsuponitsgreenleavesforusingthesun’’senergytomakefoodfrominorganicchemicals.Thesearegeneraladaptationscommontomostplants.Inadditiontherearespecialadaptationsthatonlycertainkindsofplantshave. Manyanimalshaveadaptationsthathelpthemescapefromtheirenemies.Someinsectsarehiddenbytheirbodycolororshapeandmanylooklikealeaforalittlebranch.Thecoatsofdeerarecoloredtomixwiththesurroundings.Manyanimalshavetheabilitytoremaincompletelystillwhenanenemyisnear. Organismshaveagreatvarietyofwaysofadapting.Theymayadaptintheirstructurefunctionandgenetics;intheirdevelopmentandproductionoftheyoung;andinotherrespects.Anorganismmaycreateitswonenvironmentasdowarm-bloodedmammalswhichhavetheabilitytoadjustbodyheatexactlytomaintaintheiridealtemperaturedespitechangingweather.Usuallyadaptationsareanadvantagebutsometimesanorganismissowelladaptedtoaparticularenvironmentthatifconditionschangeitfindsitdifficultorimpossibletoreadapttothenewconditions. Theauthorcitesthebehaviorofwarm-bloodedmammalsinordertoillustratewhichofthefollowing?
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
Heoftenfindsfaultwithmywork.
Whenhearrivedhomehedepositedhiscoatonthefloor.
Threestraightlinesmeetingatthreepointsconstituteatriangle.
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. AccordingtothepassagethealarmingincreaseintherateofdiabetesamongchildrenintheUKmaypartlybeexplainedbytherisein______.
Hershoes{{U}}gowith{{/U}}hergloves;theylookverywelltogether.
GlobalWarmingandTechnologicalchanges Recentstudieshaveidentifiedfourmajorglobalenvironmentalrisks:acidrainozonedepletiondeforestationandthegreenhouseeffect.OnthewholethankstotechnologicalchangespeoplenowtendtomovetowardwarmerregionsinNorthAmericaandEurope.ClimatewarmingwillprobablybeaboontoAlaskawhichisAmerica’’sleastproductivestateinGrossNationalProductGNPpersquaremile. StudiesoftheimpactofglobalwarmingontheUnitedStatesandotherdevelopedregionsfindthatthemostvulnerableareasarethosedependentonunmanagedecosystems—onnaturallyoccurringrainfallrun-offandtemperaturesandtheextremesofthesevariables.Agricultureforestryandcoastalactivitiesfallintothiscategory. Mosteconomicactivityinindustrializedcountrieshoweverdependsverylittleontheclimate.Intensive-careunitsofhospitalscommunicationsheavymanufacturingandmicroelectronicsareamongthesectorslikelytobeunaffectedbyclimaticchange.InselectingwhethertosetupinsayHongKongorinWarsawfewbusinesseswillconsidertemperatureaweightyfactor. GreenhousewarmingwouldhavelittleeffectonAmericasnationaloutput.About3%ofAmericanGNPoriginatesinclimatesensitivesectorssuchasfarmingandforestry.Another10%comesfromsectorsonlymodestlysensitive-energywatersystemspropertyandconstruction.Forthelargestshare87%comesfromsectorsincludingmostservicesthatarenegligiblyaffectedbyclimatechange. 13%ofAmericanGNPcomefromsectorsaffectedbyclimatechanges.
Theearthquakehascausedseriousdamagetothiscity.
AdaptationofLivingThings Certainanimalsandplantsdevelopcharacteristicsthathelpthemcopewiththeirenvironmentbetterthanothersoftheirkind.Thisnaturalbiologicalprocessiscalledadaptation.Amongthesuperiorcharacteristicsdevelopedthroughadaptationarethosethatmayhelpingettingfoodorshelterinprovidingprotectionandinproducingandprotectingtheyoung.Thatresultsintheevolutionofmoreandmoreorganismsthatarebetterfittedtotheirenvironments. Eachlivingthingisadaptedtoitswayoflifeinageneralwaybuteachisadaptedespeciallytoitsowndistinctclass.Aplantforexampledependsuponitsrootstofixitselffirmlyandtoabsorbwaterandinorganicchemicals.Itdependsuponitsgreenleavesforusingthesun’’senergytomakefoodfrominorganicchemicals.Thesearegeneraladaptationscommontomostplants.Inadditiontherearespecialadaptationsthatonlycertainkindsofplantshave. Manyanimalshaveadaptationsthathelpthemescapefromtheirenemies.Someinsectsarehiddenbytheirbodycolororshapeandmanylooklikealeaforalittlebranch.Thecoatsofdeerarecoloredtomixwiththesurroundings.Manyanimalshavetheabilitytoremaincompletelystillwhenanenemyisnear. Organismshaveagreatvarietyofwaysofadapting.Theymayadaptintheirstructurefunctionandgenetics;intheirdevelopmentandproductionoftheyoung;andinotherrespects.Anorganismmaycreateitswonenvironmentasdowarm-bloodedmammalswhichhavetheabilitytoadjustbodyheatexactlytomaintaintheiridealtemperaturedespitechangingweather.Usuallyadaptationsareanadvantagebutsometimesanorganismissowelladaptedtoaparticularenvironmentthatifconditionschangeitfindsitdifficultorimpossibletoreadapttothenewconditions. Someplantsandanimalsdevelopsuperiorcharacteristicssothattheymay______.
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. WhichofthefollowingcanbeinferredfromthepassageabouttheNativeAmericaninhabitantsofUngavaBay?
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. Theprimarypurposeofthepassageisto______.
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. AccordingtothepassagetheBritishcolonialistsdifferedfromtheSpanishcolonialistsinthattheformer______.
GlobalWarmingandTechnologicalchanges Recentstudieshaveidentifiedfourmajorglobalenvironmentalrisks:acidrainozonedepletiondeforestationandthegreenhouseeffect.OnthewholethankstotechnologicalchangespeoplenowtendtomovetowardwarmerregionsinNorthAmericaandEurope.ClimatewarmingwillprobablybeaboontoAlaskawhichisAmerica’’sleastproductivestateinGrossNationalProductGNPpersquaremile. StudiesoftheimpactofglobalwarmingontheUnitedStatesandotherdevelopedregionsfindthatthemostvulnerableareasarethosedependentonunmanagedecosystems—onnaturallyoccurringrainfallrun-offandtemperaturesandtheextremesofthesevariables.Agricultureforestryandcoastalactivitiesfallintothiscategory. Mosteconomicactivityinindustrializedcountrieshoweverdependsverylittleontheclimate.Intensive-careunitsofhospitalscommunicationsheavymanufacturingandmicroelectronicsareamongthesectorslikelytobeunaffectedbyclimaticchange.InselectingwhethertosetupinsayHongKongorinWarsawfewbusinesseswillconsidertemperatureaweightyfactor. GreenhousewarmingwouldhavelittleeffectonAmericasnationaloutput.About3%ofAmericanGNPoriginatesinclimatesensitivesectorssuchasfarmingandforestry.Another10%comesfromsectorsonlymodestlysensitive-energywatersystemspropertyandconstruction.Forthelargestshare87%comesfromsectorsincludingmostservicesthatarenegligiblyaffectedbyclimatechange. Ozonedepletionisnotaenvironmentalproblem.
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