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大学英语英语四级练习卷(含答案)(1).pdf

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大学英语四级试练习卷 一、阅读理解 Waterproblemsinthefuturewillbecomenoreintenseandmorecomplex. Ourincreasingpopulationwilltremendouslyincreaseurban wastes,primarilysewage.Ontheotherhand,increasingdemandsforwater willdeceasesubstantialytheamountofwateravailablefordiluting wastes.Rapidlyexpandingindustrieswhichinvolvemoreandmorecomplex chemicalprocesseswillproducelargevolumesofliquidwastes,andmany ofthesewillcontainchemicalswhicharenoxious.Tofeedourrapidly expandingpopulation,agriculturewillhavetobeintensifieD.Thiswill involveever-increasingquantitiesofagriculturalchemicals,Fromthis, itisapparentthatdrasticstepsmustbetakenimmediatelytodevelop correctivemeasuresforthepollutionproblem.Therearetwowaysby whichthispollutionproblemcanbedwindleD.Thefirstrelatestothe treatmentofwastestodecreasetheirpollutionhazarD.Thisinvolves ofliquidwastes,orefflunets,topermitthereuseofthewateror minimizepollutionuponfinaldisposal.Asecondapproachistodevelop aneconomicuseforallorapartofthe wastes.Farmmanureisspreadinfieldsasanutrientororganic supplement.Effluentsfromsewagedisposalplantsareusedinsomeareas bothforirrigationandforthenutrientscontaineD.Efflunetsfromother processingplantsmayalsobeusedasasupplementalsourceofwater. Manyindustries,suchasmeatandpoultryprocessingplants,are currentlyconvertingformerwasteproductsintomarketablebyproducts. Otherindustriesarepotentialeonomicusesforwasteproducts. 1.Thepurposeofthisis______. A.toalertthereadertothedwindlingwatersupply B.toexplainindustrialusesofwater C.toacquaintthereaderwithwaterpollutionproblems D.todemostratevariousmeasurestosolvethepollutionproblem 2.WhichofthefollowingpointsisNOTINCLUDEDinthe? A.Industrialdevelopmentincudesthesimplificationofcomplexchemical processes. B.Dilutingwastesneedscertainamountofwater C.Demandsforwaterwillgoupalongwiththeexpandingpopulation D.Intensivecultivationoflandrequiresmoreandmorechemicals 3.Thereadercanconcluedthat________. A.countriesoftheworldwillworktogetheronpolutionproblems B