大学英语四级模拟试题四（附含答案解析)

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1、范文范例精心整理大学英语四级模拟题四一二三四五六试卷总得分核查人PartOneReadingComprehension(2’×10=20’)Directions:Thereare2passagesinthissection.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).Youshoulddecideonthebestchoiceandmarkthe

2、correspondingletterontheAnswerSheetwithasinglelinethroughthecentre.PassageOneAirpollutioncanspreadfromcitytocity.Itevenspreadsfromonecountrytoanother.SomenorthernEuropeancountrieshavehad“blacksnow”frompollutantsthathavetraveledthroughtheairfromothercountriesandha

3、vefallenwiththesnow.Soairpollutionisreallyaglobalproblem.Airpollutioncankillbabies,olderpeople,andthosewhohaverespiratory（呼吸的）diseases.Asfoundincities,airpollutionincreasestherisksofcertainlungdiseases.Airpollutioncancausebothairplaneandcaraccidentsbecauseitcutsd

4、ownvisibility（能见度）.Thereareotherpossiblehealthdangersfromairpollutionthatwedon’tknowmuchabout.Forexample,scientistsaretryingtofindoutwhetherchemicalsthatreachusfromtheairmaycausechangesinourcells.Thesechangesmightcausebabiestobebornwithseriousbirthdefects.Scienti

5、stsaretryingtolearnhowallthemanychemicalsareapt（易于的）totakeintoourbodiesfromair,water,food,andevenmedicinesacttogethertoaffectourhealthandthewayourbodieswork.Thatisanotherreasonwhyitissoimportanttobegintocontrolpollutionnowinsteadofwaitinguntilwelearnalltheanswers

6、.Airpollutioncostsusalotofmoney.Itcorrodes（腐蚀）ourbuildings.Itdamagesfarmcropsandforests.Ithasadestructiveeffectonourworksofart.Thecostofallthisdamagetoourgovernmentisgreat.Itwouldbemuchmoreworthwhile,bothforusandforthegovernment,tospendourtaxdollarsonairpollution

7、control.1.Airpollutionmayleadtoairplaneaccidentsbecause.A.itmaycausepilotstobeillB.enginesmayfailfromtheair-bornedirtC.visibilityisreducedD.itbringsalotofblacksnow2.Scientistsaretryingtofindalinkbetweenpollutionand.A.intelligencelevelsB.birthproblemsC.man’sbehavi

8、orD.thenervoussystem3.Scientistshavenotyetdetermined.A.alloftheeffectsofpollutiononthehumanbodyB.howpollutioncanbecontrolledsuccessfullyC.whentheatmospherefirs