大学英语四级模拟题十三及答案

《大学英语四级模拟题十三及答案》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、大学英语四级模拟题十三及答案大学英语四级模拟题十三及答案PartⅡReadingComprehension(35minutes)Directions:Thereare4passagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswe

2、rSheetwithasinglelinethroughthecenter.Questions21to25arebasedonthefollowingpassage:Someradiosingalswereheardin1967.Theywerecomingfromapointintheskywheretherewasunknownstar.Theywerecomingveryregularly,too:aboutonceasecond,iftheywerecontrolledbyclock.Thescientistswhoheardthesignalsdi

3、dnottellanybodyelse.Theywereratherafraidtotellincasetheyfrightenedpeople.Thesignalswerecomingfromaverysmallbody—nobigger,perhapsthantheearth.Wasthatwhynolightcouldbeseenfromit?Orwerethesignalscomingfromaplanetthatbelongedtosomeotherstar?Therewasnoendtothequestions,butthescientistsk

4、eptthenewssecret.“Perhapsthereareintelligentbeingsoutthere.”theythought,“whoaretryingtosendmessagestootherplanets,ortous?Sothenewswasnotgiventothenewspaper.Instead,thescientistsstudiedthesignalsandsearchedforotherslikethem...Well,allthathappenedin1967and1968.Sincethenscientistshavel

5、earntmoreaboutthosestrange,regular,radiosignals.Andtheyhavetoldthestory,ofcourse.Thesignalsdonotcomefromaplanet;theycomefromanewkindofstarcalleda“pulsar””.Aboutahundredotherpulsarshavenowbeenfound,andmostofthemareverylikethefirstone.Pulsarsarestrongradiostars.Theyarethesmallestbutt

6、heheavieststarsweknowatpresent.Ahandfulofpulsarwouldweighafewthousandtons.Theirlight—iftheygivemuchlight—istoosmallforustosee.Butwecanbesureofthis,nointelligentbeingsarelivingonthem.21.Theradiosignalsdiscussedinthispassage____.A.wereregularB.werecontrolledbyaclockC.wereheardin1967

7、onlyD.weresecretmessages22.Theradiosingalsweresentby____.A.asatelliteB.aplanetC.askybodywhichwasunknownatthattimeD.intelligentbeingswhowereunknownatthattime23.Thescientistsdidnottellpeopleaboutthesignalsbecause____.A.thesingalsstoodforsecretmessagesB.peoplewouldaskthemtooman

8、yquestionsC.theydi