英语四级考前辅导训练题带答案2017年英语四级考前辅导训练题带答案Somethingattempted,somethingdone.以下是小编为大家搜索整理的2017年英语四级考前辅导训练题带答案，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!Somepessimisticexpertsfeelthattheautomobileisboundtofallintodisuse.Theyseeadayinthenot-too-distantfuturewhenallautoswillbeabandonedandallowedtorust.Otherauthorities,however,thinktheautoisheretostay.Theyholdthatthecarwillremainaleadingmeansofurbantravelintheforeseeablefuture.Themotorcarwillundoubtedlychangesignificantlyoverthenext30years.Itshouldbecomesmaller,safer,andmoreeconomical,andshouldnotbepoweredbythegasolineengine.Thecarofthefutureshouldbefarmorepollution-freethanpresenttypes.Regardlessofitspowersource,theautointhefuturewillstillbethemainprobleminurbantrafficcongestion(拥挤).Oneproposedsolutiontothisproblemistheautomatedhighwaysystem.Whentheautoentersthehighwaysystem,aretractable(可伸缩的)armwilldropfromtheautoandmakecontactwitharail,whichissimilartothosepoweringsubwaytrainselectrically.Onceattachedtotherail,thecarwillbecomeelectricallypoweredfromthesystem,andcontrolofthevehiclewillpasstoacentralcomputer.Thecomputerwillthenmonitorallofthecar’smovements.Thedriverwilluseatelephonetodialinstructionsabouthisdestinationintothesystem.Thecomputerwillcalculatethebestroute,andreservespaceforthecarallthewaytothecorrectexitfromthehighway.Thedriverwillthenbefreetorelaxandwaitforthebuzzer(蜂鸣器)thatwillwarnhimofhiscomingexit.Itisestimatedthatanautomatedhighwaywillbeabletohandle10,000vehiclesperhour,comparedwiththe1,500to2,000vehiclesthatcanbecarriedbyapresent-dayhighway.练习题：Choosecorrectanswerstothequestion:1.Onesignificantimprovementinthefuturecarwillprobablybe________.A.itspowersourceB.itsdrivingsystemC.itsmonitoringsystemD.itsseatingcapacity2.Whatistheauthor’smainconcern?A.Howtorenderautomobilespollution-free.B.Howtomakesmallerandsaferautomobiles.C.Howtosolvetheproblemoftrafficjams.D.Howtodevelopanautomatedsubwaysystem.3.Whatprovidesautoswithelectricpowerinanautomatedhighwaysystem?A.Arail.B.Anengine.C.Aretractablearm.D.Acomputercontroller.4.Ina