题目内容：
根据以下材料，回答题 GlobalWarming
1．Smokeiscloudingourviewofglobalwarming,protectingtheplanetfromperhapsthreequartersofthegreenhouse(温室)effect．Thatmightsoundlikegoodnews,butexpertssaythatasthecoverdiminishesincomingdecades,wearefacingadramaticincreaseofwarmingthatcouldbetwooreventhreetimesasgreatasofficialbestguesses.
2．ThiswasthedramaticconclusionreachedlastweekataworkshopinDahlem,Berlin,wheretopatmosphericscientistsgottogether,includingNobelPrizewinnerPaulCrutzenandSwedishscientistBertBolin,formerchairmanoftheUN'sIntergovernmentalPanelonClimateChange(IPCC).
3．IPCCscientistshavesuspectedforadecadethataerosols(浮质)ofsmokeandotherparticlesfromburningrainforest,cropwasteandfossilfuelsareblockingsunlightandcounteractingthewarmingeffectofcarbondioxide(二氧化物)emissions．Untilnow,theyreckonedthataerosolsreducedgreenhousewarmingbyperhapsaquarter,cuttingincreasesby0.2℃．Sothe0.6℃ofwarmingoverthepastcenturywouldhavebeen0.8℃withoutaerosols.
4．ButtheBerlinworkshopconcludedthattherealfigureisevenhigher--aerosolsmayhavereducedglobalwarmingbyasmuchasthree-quarters,cuttingincreasesby1.8℃．Ifso,thegoodnewsisthataerosolshavepreventedtheworldgettingalmosttwodegreeswarmerthanitisnow．Butthebadnewsisthattheclimatesystemismuchmoresensitivetogreenhousegasesthanpreviouslyguessed.
5．Asthosegasesareexpectedtocontinueaccumulatingintheatmospherewhileaerosolsstabilizeorfall,thatmeans"dramaticconsequencesforestimatesoffutureclimatechange",thescientistsagreedinadraftreportfromtheworkshop.
Paragraph2__________. A．Atmosphericscientists
B．ThecalculationsmadeattheBerlinworkshop
C．Thepreviouscalculationsoftheeffectofaerosols
D．Thescientists'agreement
E．Theauthoritativeconclusion
F．Greenhousegases
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