Today, most countries in the world have canals

Today,mostcountriesintheworldhavecanals.Manycountrieshavebuiltcanalsnearthecoast,andparallel__1_thecoast.Eveninthetwentiethcentury,goodscanbemovedmorecheaplybyboatthanbyanyother__2__oftransport.These__3__makeitpossibleforboatstotravel__4__portsalongthecoastwithoutbeing___5__tothedangersoftheopen.Somecanals,suchastheSuezandthePanama,saveshipsweeksoftimebymakingtheir__6___athousandmilesshorter.Othercanalspermitboatstoreachcitiesthatarenot__7__onthecoast,stillothercanals___8__landsswheresthereistoomuchwater,helpto__9___fieldswherethereisnotenoughwater,and___10__waterpowerforfactoriesandmills.Thesizeofacanal___11___onthekindofboatsgoingthroughit.Thecanalmustbewideenoughtopermittwoofthelargestboatsusingitto___12__eachothereasily.Itmustbedeepenoughtoleaveabouttwofeetofwater___13__thekeelofthelargestboatusingthecanal.WhentheplanetMarswasfirst__14___throughatelescope,peoplesawthattherounddiskoftheplanetwascriss-crossedbya__15___ofstrangeblue-greenlines.Thesewerecalled“canals”__16___theylookedthesameascanalsonearth__17___areviewedfromanairplane.However,scientistsarenow__18___thattheMartianphenomenaarereallynotcanals.Thephotographs___19___fromspace-shipshavehelpedusto__20___thetruthabouttheMartia“canals”.1.A.offB.withC.toD.by2.A.wayB.meansC.methodD.approach3.A.waterwaysB.waterfrontsC.channelsD.paths4.A.amongB.betweenC.inD.to5.A.revealedB.exposedC.openedD.shown6.A.tripB.journeyC.voyageD.route7.A.lainB.stationedC.setD.located8.A.escapeB.drainC.dryD.leak9.A.waterB.wetC.soakD.irrigate10.A.furnishB.affordC.offerD.give11.A.focusesB.basesC.dependsD.takes12.A.crossB.passC.moveD.advance13.A.downB.belowC.beneathD.off14.A.studiedB.researchedC.surveyedD.observed15.A.fewB.numberC.dealD.supply16.A.althoughB.becauseC.soD.if17.A.thatB.whereC.whenD.as18.A.exactB.definiteC.certainD.decisive19.A.heldB.takenC.gotD.developed20.A.findB.exposeC.uncoverD.discover1.【答案】B【解析】bydoing“通过某种方式”，其他三个介词不适用。2.【答案】D【解析】thenumberof“……的数量”，修饰可数名词。3.【答案】A【解析】than的前面要用比较级，表示多的意思只能选more。4.【答案】B【解析】from…to“从……到……”，固定搭配。5.【答案】C【解析】itsown“它自己的”。6.【答案】C【解析】including作介词，“包括”；consist…of“由……组成”。making和taking词意不符7.【答案】D【解析】aswell“也，除……之外”。其他词与well搭配，无此意思。8.【答案】A【解析】ago是从现在算起；before是从过去某一时点算起。9.【答案】D【解析】fund“资金”，这里是说“大学从政府的拨款中获得全部的资金”。suggestions“建议”；grades“成绩”；profits“利润”。10.【答案】B【解析】payfees“支付费用”。本句意为学生得支付学习和生活费用。11.【答案】C【解析】where引导地点状语从句。12.【答案】C【解析】lodgingandfood“食宿”，固定搭配。13.【答案】D【解析】这里是说“学生可以受到居住地政府的资助，包括食宿，除非他父母富有。14.【答案】B【解析】这里是说大多数学生在暑假打工大约六星期。15.【答案】D【解析】在这里介词for表示一段时间。16.【答案】B【解析】work与前面的jobs相呼应。17.【答案】A【解析】takeresponsibilityfor“对……承担责任”，固定搭配。18.【答案】C【解析】这里是说教育部承担了大学的全部支付。19.【答案】C【解析】haveinfluenceon“对……产生影响”，固定搭配。20.【答案】B【解析】becomposedof“由……组成”，固定搭配。原文Today,mostcountriesintheworldhavecanals.Manycountrieshavebuiltcanalsnearthecoast,andparallelwiththecoast.Eveninthetwentiethcentury,goodscanbemovedmorecheaplybyboatthanbyanyotherapproachoftransport.Thesewaterwaysmakeitpossibleforboatstotravelbetweenportsalongthecoastwithoutbeingopenedtothedangersoftheopen.Somecanals,suchastheSuezandthePanama,saveshipsweeksoftimebymakingtheirvoyageathousandmilesshorter.Othercanalspermitboatstoreachcitiesthatarenotlocatedonthecoast,stillothercanalsescapelandsswheresthereistoomuchwater,helptoirrigatefieldswherethereisnotenoughwater,andaffordwaterpowerforfactoriesandmills.Thesizeofacanaldependsonthekindofboatsgoingthroughit.Thecanalmustbewideenoughtopermittwoofthelargestboatsusingittomoveeachothereasily.Itmustbedeepenoughtoleaveabouttwofeetofwateroffthekeelofthelargestboatusingthecanal.WhentheplanetMarswasfirstresearchedthroughatelescope,peoplesawthattherounddiskoftheplanetwascriss-crossedbyasupplyofstrangeblue-greenlines.Thesewerecalled“canals”becausetheylookedthesameascanalsonearththatareviewedfromanairplane.However,scientistsarenowcertainthattheMartianphenomenaarereallynotcanals.Thephotographsgotfromspace-shipshavehelpedustoexposethetruthabouttheMartia“canals”.