大學(xué)英語四級閱讀理解試題及答案(四)

大學(xué)英語四級閱讀理解試題及答案（四）十六Treesshouldonlybeprunedwhenthereisagoodandclearreasonfordoingsoand,fortunately,thenumberofsuchreasonsissmall.Pruninginvolvesthecuttingawayofobergrownandunwantedbranches,andtheinexperiencedgardenercanbeencouragedbythethoughtthatmoredamageresultsfromdoingitunnecessarilythanfromleavingthetreetogrowinitsownway.First,pruningmaybedonetomakesurethattreeshaveadesiredshapeorsize.Theobjectmaybetogetatreeoftherightheight,andatthesametimetohelpthegrowthofsmallsidebrancheswhichwillthickenitsappearanceorgiveitaspecialshape.Secondly,pruningmaybedonetomakethetreehealthier.Youmaycutdiseaedordeadwood,orbranchesthatarerubbingagainsteachotherandthuscausewounds.Thehealthofatreemaybeencouragedbyremovingbranchesthatareblockingupthecentreandsopreventingthefreemovementofair.Oneresultofpruningisthatanopenwoundisleftonthetreeandthisprovidesaneasyentryfordisease,butitisawoundthatwillheal.Oftenthereisaracebetweenthehealingandthedeseaseastowhetherthetreewillliveordie,sothatthereisaperiodwhenthetreeisatrisk.Itshouldbetheaimofeverygardenertoreducewhichhasbeenprunedsmoothandclean,forhealingwillbesloweddownbyroughness.Youshouldallowthecutsurfacetodryforafewhursandthenpaintitwithoneofthesubstancesavailablefromgardenshopsproducedespeciallyforthispurpose.Pruningisusuallywithoutinterferencefromtheleavesandalsoitisveryunlikelythatthecutsyumakewillbleed.Ifthisdoeshappen,itis,ofcourse,impossibletopaintthemproperly.1.Pruningshouldbedoneto______.a.makethetreegrowtallerb.improvetheshapeofthetreec.getridofthesmallbranchesd.makethesmallbranchesthicker2.Treesbecomeunhealthyifthegardener______.a.becauseMrs.Clarkerefusedtoopenthedoorb.whentheman'sglovedroppedoffc.becauseitwastoohottoholdd.becausethemanjustwantedtogetaway答案：cadbd十八Manypeoplebelievetheglarefromsnowcausessnowblindnenss.Yet,darkglassesornot,theyfindthemselvessufferingfromheadachesandwateringeyes,andevensnowblindness,whenexposedtoseveralhoursof"snowlight".TheUnitedStatesArmyhasnowdeterminedthatglarefromsnowdoesnotcausesnowblindnessintroopsinasnow-coveredcountry.Rather,aman'seyesfrequentlyfindnothingtofoucsoninabroadexpanseofbarrensnow-coveredterrain.Sohisgazecontinuallyshiftsandjumpsbackandforthovertheentirelandscapeinsearchoftsomethingtolookat.Findingnothing,hourafterhour,theeyesneversotpsearchingandtheeyeballsbecomesoreandtheeyemusclesache.Natureoffsetsthisirritationbyproducingmoreandfluidwhichcoverstheeyeball.Thefluidcoverstheeyeballinincreasingquantityuntilvisionblurs,thenisobsured,andtheresultistotal,eventhoughtemporary,snowblindness.ExperimentsledtheArmytoasimplemethodofovercomingthisproblem.Scoutsaheadofamainbodyoftroopsaretrainedtoshakesnowfromevergreenbushes,creatingadottedlineastheycrosscompletelysnow-coveredlandscape,Eventhescoutsthemselvesthrowlightweight,darkcoloredobjectsaheadonwhichtheytoocanfocus.Themenfollowingcanthenseesomething.Theirgazeisarrested.Theireyesfocusonabushandhavingfoundsomethingtosee,stopscouringthesnow-blanketedlanscape.Byfocusingtheirattentionononeobjectatatime,themencancrossthesnowwithoutbecominghopelesslysnowblindorlost.Inthiswaytheproblemofcrossingasolidwhiteterrainisovercome.1.Topreventheadaches,wateringeyesandblindnesscausedbytheglarefromsnow,darkglassesare_____.a.indispensibleb.usefulc.ineffectived.available2.Whentheeyesaresoretearsareproducedto________.a.clearthevisionb.remedysnowblindnessc.easetheirritationd.loosenthemuscles3.Snowblindnessmaybeavoidedby_______.a.concentratingtothesolidwhiteterrainb.searchingforsomethingtolookatinsnow-coveredvidingtheeyeswithsomethingtofoucsond.coveringtheeyeballswithfluid4.Thescoutsshakesnowfromevergreenbushesinorderto_______.a.bivethemenbehindsomethingtoseeb.beautifythelandscapec.warmthemselvesinthecoldd.preventthemenbehindfromlosingtheirway5.Asuitabletitleforthispassagewouldbe_______.a.snowblindnessandhowtoovercomeitb.natrue'scureforsnowblindnessc.soldiersinthesnowd.snowvision答案：CCCAA十九Waterproblemsinthefuturewillbecomenoreintenseandmorecomplex.Ourincreasingpopulationwilltremendouslyincreaseurbanwastes,primarilysewage.Ontheotherhand,increasingdemandsforwaterwilldeceasesubstantialytheamountofwateravailablefordilutingwastes.Rapidlyexpandingindustrieswhichinvolvemoreandmorecomplexchemicalprocesseswillproducelargevolumesofliquidwastes,andmanyofthesewillcontainchemicalswhicharenoxious.Tofeedourrapidlyexpandingpopulation,agriculturewillhavetobeintensified.Thiswillinvolveever-increasingquantitiesofagriculturalchemicals,Fromthis,itisapparentthatdrasticstepsmustbetakenimmediatelytodevelopcorrectivemeasuresforthepollutionproblem.Therearetwowaysbywhichthispollutionproblemcanbedwindled.Thefirstrelatestothetreatmentofwastestodecreasetheirpollutionhazard.Thisinvolvestheprocessingofsolidwastes"priorto"disposalandthetreatmentofliquidwastes,orefflunets,topermitthereuseofthewaterorminimizepollutionuponfinaldisposal.Asecondapproachistodevelopaneconomicuseforallorapartofthewastes.Farmmanureisspreadinfieldsasanutrientororganicsupplement.Effluentsfromsewagedisposalplantsareusedinsomeareasbothforirrigationandforthenutrientscontained.Efflunetsfromotherprocessingplantsmayalsobeusedasasupplementalsourceofwater.Manyindustries,suchasmeatandpoultryprocessingplants,arecurrentlyconvertingformerwasteproductsintomarketablebyproducts.Otherindustriesarepotentialeonomicusesforwasteproducts.1.Thepurposeofthispassageis______.a.toalertthereadertothedwindlingwatersupplyb.toexplainindustrialusesofwaterc.toacquaintthereaderwithwaterpollutionproblemsd.todemostratevariousmeasurestosolvethepollutionproblem2.WhichofthefollowingpointsisNOTINCLUDEDinthepassage?a.Industrialdevelopmentincudesthesimplificationofcomplexchemicalprocesses.b.Dilutingwastesneedscertainamountofwaterc.Demandsforwaterwillgoupalongwiththeexpandingpopulationd.Intensivecultivationoflandrequiresmoreandmorechemicals3.Thereadercanconcluedthat________.a.countriesoftheworldwillworktogetheronpolutionproblemsb.byproductsfromwastesleadtoamoreprosperousmarketplacec.scienceismakinggreatprogressonincreasingwatersuppliesd.someindustriesarenow,akingeconomicuseofwastes4.Theauthorgivessubstancetothepassagethroughtheuseof_______.erviewswithauthoritiesinthefieldofwatercontrolsb.opinionsandpersonalobservationsc.definitionswhichclarifyimportanttermsd.strongargumentsandpersuasions5.Thewords"priorto"(para.2)probablymean______.a.afterb.duringc.befored.beyond答案:cadbc二十Oneofthequalitiesthatmostpeopleadmireinothersisthewillingnesstoadmitone'smistakes.Itisextremelyhardsometimestosayasimplethinglike"Iwaswrongaboutthat,"anditisevenhardertosay,"Iwaswrong,andyouwererightaboutthat."Ihadanexperiencerecentlywithsomeoneadmittingtomethathehadmadeamistakefifteenyearsago.HetoldmehehadbeenthemanagerofacertaingrocerystoreintheneighbourhoodwhereIgrewup,andheaskedmeifIrememberedtheeggcartons.ThenherelatedanincidentandIbegantoremembervaguelytheincidenthewasdescribing.Iwasabouteightyearsoldatthetime,andIhadgomeintothestorewithmaymothertodotheweeklygroceryshopping.Onthatparticularday,Imusthavefoundmywaytothedairyfooddepartmentwheretheincidenttoodplace.Theremusthavebeenaspecialsaleoneggsthatdaybecausetherewasanimpressivedisplayofeggsindozenandhalf-dozencartons.Thecartonswerestackedthreeorfourfeethigh.Imusthavestoppedinfrontofadisplaytoadmirethestacks.Justthenawomancamebypushinghergrocerycartandknockedoffthestacksofcartons.Forsomereason,Idecideditwasuptometoputthedisplaybacktogether,soIwanttowork.Themanagerheardthemoiseandcamerushingovertoseewhathadhappened.Whenheappeared,Iwasonmykneesinspectingsomeofthecartonstoseeifanyoftheeggswerebroken,buttohimitlookedasthoughIwastheculprit.Heseverelyreprimandedmeandwantedmetopayforanybrokeneggs.Iprotestedmyinnocenceandtriedtoexplain,butitdidnogood.EventhoughIquicklyforgotallabouttheincident,apparentlytheman