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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,floodingcoastalsettlementsandforcingpeopletomigrateinland.Deser
2、tsspreadthroughouttheworldasvegetationshifteddrasticallyinNorthAmerica,EuropeandAsia.Afterdrivingmanyoftheanimalsaroundthemtonearextinction,peoplewereforcedtoabandontheiroldwayoflifeforaradicallynewsurvivalstrategythatresultedinwidespreadstarvationanddisease.Theadaptationwasfarmin
3、g:theglobal-warmingcrisishatgaverisetoithappenedmorethan10,000yearsago.AsenvironmentalistsconveneinRiodeJaneirothisweektopondertheglobalclimateofthefuture,earthscientistsareinthemidstofarevolutioninunderstandinghowclimatehaschangedinthepast—andhowthosechangeshavetransformedhumanex
4、istence.Researchershavebeguntopiecetogetheranilluminatingpictureofthepowerfulgeologicalandastronomicalforcesthathavecombinedtochangetheplanet’senvironmentfromhottocold,wettodryandbackagainoveratimeperiodstretchingbackhundredsofmillionsofyears.回溯到以前Mostimportant,scientistsarebeginn
5、ingtorealizethattheclimaticchangeshavehadamajorimpactontheevolutionofthehumanspecies.Newresearchnowsuggeststhatclimateshiftshaveplayedakeyroleinnearlyeverysignificantturningpointinhumanevolution:fromthedawnofprimates(灵长目动物)some65millionyearsagotohumanancestorsrisinguptowalkontwole
6、gs,fromthehugeexpansionofthehumanbraintotheriseofagriculture.Indeed,thehumanhistoryhasnotbeenmerelytouchedbyglobalclimatechange,somescientistsargue,ithasinsomeinstancesbeendrivenbyit.ThenewresearchhasprofoundimplicationsfortheenvironmentalsummitinRio.Amongotherthings,thefindingsde
7、monstratethatdramaticclimatechangeisnothingnewforplanetEarth.Thebenign(宜人的)globalenvironmentthathasexistedoverthepast10,000years—duringwhichagriculture,writing,citiesandmostotherfeaturesofcivilizationappeared—isamerebrightspotinamuchlargerpatternofwidelyvaryingclimateovertheages.I
8、nfact,thepatternofclimatechangein