【问题】 Aftertraveling203days,coveringadistanceofmorethan470millionkilometers,NASA'sPerseveranceautomaticrobotfinisheditslongjourney,reachingthedestination-Mars. ThegoalofPerseveranceisanareacalledTheLake,whichwaschosenonthebasisoftheresearchcarriedoutinrecentyea

Aftertraveling203days,coveringadistanceofmorethan470millionkilometers,NASA'sPerseveranceautomaticrobotfinisheditslongjourney,reachingthedestination-Mars. ThegoalofPerseveranceisanareacalledTheLake,whichwaschosenonthebasisoftheresearchcarriedoutinrecentyears.ResearchersbelievethatalongtimeTheLakehousedariver,whichflowedintoalake.Therover(巡航器),aboutthesizeofanSUV,willhavetoperformarathercomplexmaneuver(机动)inafewminutestoslowdownitsrunandreachtheMartiansurface.Ifallgoesasplanned,Perseverancewillhelpusanswerthequestionofquestions:WasthereeverlifeonMars? Amongthemanythingsthatcanbedoneinoursolarsystem,makingacontrolledlandingonMarsisoneofthemostcomplicated.TheMartianatmosphereisthinnerthantheEarth'sandconsequentlyanobjectpassingthroughitdoesnotslowdownmuch.Thetimetoentertheatmosphere,descend(下降)andlandisrelativelyshort,nottomentionthatthegreatdistancefromtheEarth(onaverage254millionkilometers)makesdirectcontrolimpossible.Inthose"sevenminutesofterror",asNASAdefinesthem,Perseverancewillhavetodoeverythingbyitselfwithitson-boardsystemsandwithoutthepossibilityofinterventionsandcorrectionsfromthecontrolcenter. Allofthiswillhappenautomaticallyand,ifallgoesaccordingtotheplan,PerseverancewillbesafeandsoundonMarsat9:55pm(Italiantime).However,Marsisveryfarfromusandonlyafter12minuteswillweknowifithasallgoneaccordingtoplan.Perseverancewillsendasignalwhenitbeginsitsdescenttotheplanet,butbythetimewereceiveit,theroverwillhavefinishedits"sevenminutesofterror"andwillhavebeenonthesurfaceforfiveminutes.Inthefollowinghours,hisinstrumentswillsenddataandfootageofthelanding,withneverbeforeseenprospectsofanarrivalontheplanet.(1)WhydotheresearcherschooseTheLakeasthelandingfield?______A.ItwillbeeasierfortheSUVtorunonthesurfaceB.ItwillhelptoexplorewhethertherewaslifeonMars.C.Therovercanfindwaterresourcetheretopoweritsengine.D.TheLakeonMarsisthenearestplacetoourearth.(2)Whatdoestheunderlinedphrase"sevenminutesofterror"inParagraph3.referto?______A.Thedirectcontrol.B.Thelanding.C.ThesystemupdatingD.TheNASA'sreport.(3)Whatcanweinferfromthelastparagraph?______A.Wewillgetthesignalwhentheroverdescendsat9:55pm.B.Perseverancewillsendthesignalimmediatelyafteritslanding.C.It'sthefirsttimefortherovertosendthedataandfootage.D.Perseveranceneeds12minutestofinishthelanding.(4)Whatisthepassagemainlyabout?______A.TheexplorationofPerseveranceonMars.B.ThearrivalofPerseveranceonMars.C.NewfindingsofPerseveranceonMars.D.WorkingprinciplesofPerseveranceonMars.

正确答案:(1)B. 细节理解题。根据原文第二段 If all goes as planned,Perseverance will help us answer the question of questions: Was there ever life on Mars?(如果一切按计划进行,"毅力"将帮助我们回答诸多问题中的问题:火星上曾经有生命吗?)可知是为了探测那个位置是否曾经存在生命。B. It will help to explore whether there was life on Mars.(它将有

题目解析:

本文是一篇说明文。本文讲述的美国国家航空航天局的火星探测器"毅力号"在经过203天、4.7亿多公里的旅行后,成功抵达火星,并介绍了其登陆火星过程中遇到的困难。

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