欢迎来到天天文库
浏览记录
ID:50182130
大小:133.00 KB
页数:18页
时间:2020-03-06
《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》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
此文档下载收益归作者所有