题目内容：
Questions are based on the following passage.SmallincreasesintemperaturefoundtoaddpowertostormsintheAtlantic.
HurricanesthatformintheAtlanticOceanareexpectedtogainconsiderablestrengthastheglobal
temperaturecontinuestorise,anewstudyhasfound.
Usingmodelingdatafocusedontheconditionsinwhichhurricanesform,agroupofinternationalre-searchersbasedatBeijingNormalUniversityfoundthatforevery1.8~F(1~C)riseoftheEarth'stemper-ature,thenumberofhurricanesintheAtlanticthatareasstrongorstrongerthanHurricaneKatrinawillincreasetwofoldtosevenfold.
Hurricanestrengthisdirectlyrelatedtotheheatofthewaterwherethestormforms.Morewaterva-porintheairfromevaporatingoceanwateraddsfueltohnricanes--alsocalledcyclonesandtyphoonsindifferentpartsoftheworld--thatbuildstrengthandheadtowardland.
HurricaneKatrinaiswidelyconsideredthemeasureforadestructivestorm,holdingthemaximumCategory5designationforafull24hoursinlateAugust2005.ItloststrengthasitpassedovertheFlori-daPeninsula,butgaineddestructivepowerrightbeforecollidingwithNewOrleans,killingmorethan200peopleandcausing$80billionindamage.
ThestudypointstoagradualincreaseofKatrina-likeevents.Thewarmingexperiencedoverthe20thcenturydoubledthenumberofsuchdebilitatingstorms.Buttheongoingwarmingoftheplanetintothe21stcenturycouldincreasethefrequencyoftheworstkindsofstormsby700percent,threateningcoast-linesalongtheAtlanticOceanwithmultipleCategory5stormseveryyear.
"Ourresultssupporttheideathatchangesinregionalseasurfacetemperaturesistheprimarycauseofhurricanevariability,"saidAslakGirnstead,aresearcherwiththeCenterforIceandClimateattheUni-versityofCopenhagen.Thelargeimpactofsmallsea-surfacetemperatureincreaseswasmorethanGirn-steadandhiscolleagueshadanticipated.TheentirestudywaspublishedintheProceedingsoftheNation-alAcademyofSciences.
Globaltemperatureshavesteadilyincreased,makingthepastdecadethewarmestonrecord.Earlierthisyear,climateresearchersreportedthattheEarth'stemperatureshaverisenfasterinthelastcenturythanatanypointsincethelasticeage,11,300yearsago.Theprimarycause,aconsensusofscientistshassaid,istherisingemissionsofgreenhousegaseslikecarbondioxideandmethane.
Pasthurricaneshavesupportedthestudy'sfindingthatglobaltemperatureriseislinkedtomorede-structivestorms.AccordingtotheNationalCenterforAtmosphericResearch,whilethefrequencyofstormsdoesn'.tappeartohaveincreased,thepercentageofstrongoneshasrisensharplyoverthepastfewdecades.Thetrendmaybesimilarfurtherbackintime,butcomprehensivehurricanedatadoesn'texist.
AccordingtotheteamofinternationalresearchersbasedatBeijingNormalUniversity,theriseoftheEarth'stemperatureislikelytocause A．thecomingoficeage
B．lessintensehurricanes
C．moreKatrina-likeorworsehurricanes
D．moregreenhousegasesintheatmosphere
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答案解析：