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1、2019-2020年高考英语二轮复习科普知识阅读理解（3）(II)科普知识（阅读理解）由(xx四川,E)改编Plantsarefloweringfasterthanscientistspredicted(预测)inreactiontoclimatechange,whichcouldhavelongdamagingeffectsonfoodchainsandecosystems.Globalwarmingishavingagreateffectonhundredsofplantandanimalspeciesaroundtheworld,ch
2、angingsomelivingpatterns,scientistssay.Increasedcarbondioxide(CO2)intheairfromburningcoalandoilcanhaveaneffectonhowplantsproduceoxygen,whilehighertemperaturesandchangeablerainfallpatternscanchangetheirpatternsofgrowth.“Predictingspecies’reactiontoclimatechangeisamajorchall
3、engeinecology,”saidtheresearchersofseveralU.S.universities.Theysaidplantshadbeenthekeyobjectofstudybecausetheirreactiontoclimatechangecouldhaveaneffectonfoodchainsandecosystemservices.Thestudy,publishedontheNaturewebsite,usesthefindingsfromplantlifecyclestudiesandexperimen
4、tsacrossfourcontinentsand1,634species.Itfoundthatsomeexperimentshadunderestimated(低估)thespeedoffloweringby8.5timesandleafingby4times.“Acrossallspecies,theexperimentsunder-predictedthespeedoftheadvance—forbothleafingandflowering—thatresultsfromtemperatureincreases,”thestudy
5、said.Thedesignoffutureexperimentsmayneedtobeimprovedtobetterpredicthowplantswillreacttoclimatechange,itsaid.PlantsarenecessaryforlifeontheEarth.Theyarethebaseofthefoodchain,usingphotosynthesis(光合作用)toproducesugarfromcarbondioxideandwater.Theyletoutoxygenwhichisneededbynear
6、lyeveryorganismontheplanet.Scientistsbelievetheworld’saveragetemperaturehasrisenbyabout0.8℃since1900,andnearly0.2℃everytenyearssince1979.Sofar,effortstocutemissions(排放)ofplanet-warminggreenhousegasesarenotseenasenoughtopreventtheEarthheatingupbeyond2℃thiscentury—apointscie
7、ntistssaywillbringthedangerofachangeableclimateinwhichweatherextremesaremon,leadingtodrought,floods,cropfailuresandrisingsealevels.1.WhatisthekeyinformationtheauthorwantstogiveinParagraph1?( )A.Plants’reactiontoweathercouldhavedamagingeffectsonecosystems.B.Theincreasingsp
8、eedoffloweringisbeyondscientists’expectation.C.Climatechangeleadstothechangeoffoodproduct
