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1、2002年6月英语六级真题PassageOneQuestions21to25arebasedonthefollowingpassage:Whenglobalwarmingfinallycame,itstuckwithavengeance(异乎寻常地).Insomeregions,temperaturesroseseveraldegreesinlessthanacentury.Sealevelsshotupnearly400feet,floodingcoastalsettlementsandforcingpeopletomigratei
2、nland.DesertsspreadthroughouttheworldasvegetationshifteddrasticallyinNorthAmerica,EuropeandAsia.Afterdrivingmanyoftheanimalsaroundthemtonearextinction,peoplewereforcedtoabandontheiroldwayoflifeforaradicallynewsurvivalstrategythatresultedinwidespreadstarvationanddisease.
3、Theadaptationwasfarming:theglobal-warmingcrisishatgaverisetoithappenedmorethan10,000yearsago.AsenvironmentalistsconveneinRiodeJaneirothisweektopondertheglobalclimateofthefuture,earthscientistsareinthemidstofarevolutioninunderstandinghowclimatehaschangedinthepast—andhowt
4、hosechangeshavetransformedhumanexistence.Researchershavebeguntopiecetogetheranilluminatingpictureofthepowerfulgeologicalandastronomicalforcesthathavecombinedtochangetheplanet’senvironmentfromhottocold,wettodryandbackagainoveratimeperiodstretchingbackhundredsofmillionsof
5、years.回溯到以前Mostimportant,scientistsarebeginningtorealizethattheclimaticchangeshavehadamajorimpactontheevolutionofthehumanspecies.Newresearchnowsuggeststhatclimateshiftshaveplayedakeyroleinnearlyeverysignificantturningpointinhumanevolution:fromthedawnofprimates(灵长目动物)som
6、e65millionyearsagotohumanancestorsrisinguptowalkontwolegs,fromthehugeexpansionofthehumanbraintotheriseofagriculture.Indeed,thehumanhistoryhasnotbeenmerelytouchedbyglobalclimatechange,somescientistsargue,ithasinsomeinstancesbeendrivenbyit.Thenewresearchhasprofoundimplica
7、tionsfortheenvironmentalsummitinRio.Amongotherthings,thefindingsdemonstratethatdramaticclimatechangeisnothingnewforplanetEarth.Thebenign(宜人的)globalenvironmentthathasexistedoverthepast10,000years—duringwhichagriculture,writing,citiesandmostotherfeaturesofcivilizationappe
8、ared—isamerebrightspotinamuchlargerpatternofwidelyvaryingclimateovertheages.Infact,thepatternofclimatechangein