2018版高中英语（人教版）选修9同步练习题：Unit 4 单元综合测评4.doc

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1、单元综合测评(四)(时间：100分钟；满分：120分)Ⅰ.阅读理解(共15小题；每小题2分，满分30分)APlantsarefloweringfasterthanscientistspredicted(预测)inreactiontoclimatechange,whichcouldhavelongdamagingeffectsonfoodchainsandecosystems.Globalwarmingishavingagreateffectonhundredsofplantandanimalspeciesaroundtheworld,ch

2、angingsomelivingpatterns,scientistssay.Increasedcarbondioxide(CO2)intheairfromburningcoalandoilcanhaveaneffectonhowplantsproduceoxygen,whilehighertemperaturesandchangeablerainfallpatternscanchangetheirpatternsofgrowth.“Predictingspecies'reactiontoclimatechangeisamajorchal

3、lengeinecology，”saidtheresearchersofseveralU．S.universities.Theysaidplantshadbeenthekeyobjectofstudybecausetheirreactiontoclimatechangecouldhaveaneffectonfoodchainsandecosystemservices.Thestudy,publishedontheNaturewebsite,usesthefindingsfromplantlifecyclestudiesandexperim

4、entsacrossfourcontinentsand1，634species.Itfoundthatsomeexperimentshadunderestimated(低估)thespeedoffloweringby8.5timesandleafingby4times.“Acrossallspecies,theexperimentsunderpredictedthespeedoftheadvance－forbothleafingandflowering－thatresultsfromtemperatureincreases，”thestu

5、dysaid.Thedesignoffutureexperimentsmayneedtobeimprovedtobetterpredicthowplantswillreacttoclimatechange,itsaid.PlantsarenecessaryforlifeontheEarth.Theyarethebaseofthefoodchain,usingphotosynthesis(光合作用)toproducesugarfromcarbondioxideandwater.Theyletoutoxygenwhichisneededbyn

6、earlyeveryorganismontheplanet.Scientistsbelievetheworld'saveragetemperaturehasrisenbyabout0.8℃since1900,andnearly0.2℃everytenyearssince1979.Sofar,effortstocutemissions(排放)ofplanetwarminggreenhousegasesarenotseenasenoughtopreventtheEarthheatingupbeyond2℃thiscentury－apoints

7、cientistssaywillbringthedangerofachangeableclimateinwhichweatherextremesarecommon,leadingtodrought,floods,cropfailuresandrisingsealevels.【语篇解读】　本文为科普类文章。文章论述了全球变暖的气候环境会让植物提前开花，进而影响整个食物链及生态系统。1．WhatisthekeyinformationtheauthorwantstogiveinParagraph1?A．Plants'reactiontoweat

8、hercouldhavedamagingeffectsonecosystems.B．Theincreasingspeedoffloweringisbeyondscientists'expect