题目内容：
根据以下资料，回答题。Plantsarefloweringfasterthanscientistspredicted（预测）inreactiontoclimatechange,whichcouldhavelongdamagingeffectsonfoodchainsandecosystems.Globalwarmingishavingagreateffectonhundredsofplantandanimalspeciesaroundtheworld,changingsomelivingpatterns,scientistssay.
Increasedcarbondioxide（CO2）intheairfromburningcoalandoilcanhaveaneffectonhowplantsproduceoxygen,whilehighertemperaturesandchangeablerainfallpatternscanchangetheirpatternsofgrowth.
“Predictingspecies’reactiontoclimatechangeisamajorchallengeinecology,”saidtheresearchesofseveralU.S．universities．Theysaidplantshadbeenthekeyobjectofstudybecausetheirreactiontoclimatechangecouldhaveaneffectonfoodchainsandecosystemservices.
Thestudy,publishedontheNaturewebsite,usesthefindingsfromplantlifecyclestudiesandexperimentsacrossfourcontinentsand1,634species．Itfoundthatsomeexperimentshadunderestimated（低估）thespeedoffloweringby8.5timesandleafingby4times.
“Acrossallspecies,theexperimentsunder-predictedthespeedoftheadvance—forbothleafingandflowering—thatresultsfromtemperatureincreases,”thestudysaid.
Thedesignoffutureexperimentsmayneedtobeimprovedtobetterpredicthowplantswillreacttoclimatechange,itsaid.
PlantsarenecessaryforlifeontheEarth．Theyarethebaseofthefoodchain,usingphotosynthesis（光合作用）toproducesugarfromcarbondioxideandwater．Theyletoutoxygenwhichisneededbynearlyeveryorganismontheplanet.
Scientistsbelievetheworld’saveragetemperaturehasrisenbyabout0.8℃since1900,andnearly0.2℃everytenyearssince1979.
Sofar,effortstocutemissions（排放）ofplanet-warminggreenhousegasesarenotseenasenoughtopreventtheEarthheatingupbeyond2℃thiscentury—apointscientistssaywillbringthedangerofachangeableclimateinwhichweatherextremesarecommon,leadingtodrought,floods,cropfailuresandrisingsealevels.WhatisthekeyinformationtheauthorwantstogiveinParagraph1? A．Plants’reactiontoweathercouldhavedamagingeffectsonecosyste
B．Theincreasingspeedoffloweringisbeyondscientists’expectatio
C．Climatechangeleadstothechangeoffoodproductionpattern
D．Foodchainshavebeenseriouslydamagedbecauseofweathe
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