四川省眉山市仁寿第一中学高三第一次调研测试新高考英语试卷及答案解析

四川省眉山市仁寿第一中学高三第一次调研测试新高考英语试卷考生请注意：1．答题前请将考场、试室号、座位号、考生号、姓名写在试卷密封线内，不得在试卷上作任何标记。2．第一部分选择题每小题选出答案后，需将答案写在试卷指定的括号内，第二部分非选择题答案写在试卷题目指定的位置上。3．考生必须保证答题卡的整洁。考试结束后，请将本试卷和答题卡一并交回。第一部分（共20小题，每小题1.5分，满分30分）1．Theydon’tfeelsafeinourtownatnightbecauseitsodangerous.There’sarobberyeveryweeknow.A．becomes B．became C．hasbecome D．hadbecome2．—Comeon,pleasegivemesomeideasabouttheproject.—Sorry.Withsomuchwork_______mymind,Ialmostbreakdown.A．filledB．fillingC．tofillD．beingfilled3．—Thankyouverymuchforeverything．You'vebeensohelpful.—__．JustletmeknowifthereisanythingelseIcandoforyou． A．Withpleasure B．Thepleasureismine． C．Pleasedon'tsayso D．No,thanks4．---TurnofftheTV,Jack.Yourhomeworknow?---Mum,justtenmoreminutes,please.A．ShouldyoubedoingB．Couldn’tyoubedoingC．Shouldn’tyoubedoingD．Willyoubedoing5．AgrandbanquetwasheldbyElizabethII_____PresidentXi’scurrentstatevisittotheUK.A．intermsofB．inhonorofC．infavorofD．inmemoryof6．Mollyfinallyagreed,_____reluctantly,togoandseeadoctor.A．afterwards B．almostC．otherwise D．somewhat7．Jane’spalefacesuggestedthatshe______illandherparentssuggestedthatshe______amedicalexam.A．be;shouldhave B．was;haveC．shouldbe;had D．was;had8．It’sdifficultforustolearnalessoninlife________we’veactuallyhadthatlesson.A．whileB．sinceC．untilD．when9．Iregretnothavingtakenyouradvice.OtherwiseI________thismistakeatthemoment.A．didn’tmake B．wouldn’tmakeC．hadn’tmake D．wouldn’thavemade10．Heisabad-temperedfellow,buthe________bequitecharmingwhenhewishes.A．shall B．shouldC．can D．must11．Whilewewerelisteningtothespeechattentively,avoice_____toannouncetheresultoftheelection.A．brokein B．brokeup C．brokeoff D．brokedown12．Wearetoholdthesportsmeetingnextweekend,________theairqualitybecomesbetter.A．which B．whenC．where D．while13．Iwantedtogiveyousomebread,but________wasleft.A．neither B．nothingC．none D．noone14．______tonuclearradiation,evenforashorttime,mayinfluencegenesinhumanbodies.A．Havingexposed B．BeingexposedC．Toexpose D．Exposed15．—Sorry,sir.I______followyou.Wouldyoupleasespeakslower?—Ok.A．can’t B．mustn’t C．shouldn’t D．needn’t16．I'veheardthatpreparations______forthecomingfestival.Let'sgivethemahand.A．arebeingmade B．havebeenmadeC．aremaking D．havemade17．Itgivesusgreatdelight______Chinesesciencefictionsarebecomingincreasinglypopular.A．how B．whatC．that D．why18．Theeventthat_________inmymemoryhappenedonemorningin1983whenIwas14yearsold.Ithasneverescaped.A．stoodoutB．standsoutC．wouldstandoutD．hasstoodout19．Becauseoftheheavysnow,wehadtodelaythevisituntilthisweekendtotheartgallery____inthecenterofourcitythesedays.A．beingheld B．holding C．tobeheld D．held20．Thepeopleinthevillageareso________thattheyarewillingtohelpeveryvisitor.A．optimistic B．energeticC．enthusiastic D．ambitious第二部分阅读理解（满分40分）阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。21．（6分）IwastravellingbytheWestCoastExpresstoMangaloretwoyearsago.Berth(铺位)No.55,notfarfromme,wasoccupiedbyamiddle-agedgentleman.WhenthetrainreachedPalakkadJunctionaround9:00p.m.,alargegroupoftouristsenteredwithmuchnoise.Justthenanothermiddle-agedmanfromthegroupdeclaredthatheownedBerth55.Heevenhadapapergivenbyhistravelagenttosupporthimself.Theticketexaminerarrivedandtoldthesecondmanthatitwasnothisberth.“No,”saidthesecondman.“It’smine.”ApolicemanfromtheRailwayProtectiontriedtogetthesecondmanleave.Buthewouldn’tgivein----andhehadthesupportofhiscompanions.Fierceargumentcontinued,evenlongafterthetrainleftPalakkad.Thensomeoneevenpulledtheemergencychain(应急链)aswewereleavingTirurstation,fourstopsafterPalakkad.Nobodycouldsleepanditwasgettinglate.Suddenly,aroundmidnight,Iwatchedateenager,astudentIamsure,climbeddownfromanupperberthclosetome.“Pleasetakemyberth,”hetoldthesecondman,whoaccepteditafterabitofhesitation.Tomygreatsurprise,thestudentthenspreadanewspaperonthefloorandwassoonlostindeepandpeacefulsleep.Bynoweveryonewasquiet,asifnothinghadhappened!I’ma58-year-oldbiologyteacherwhohashandledtworecentgenerationsofstudents.Iwasconvincedonceagainthat,contraytopopularopinions,youngpeoplecanoftenbefar,farnoblerthanmanyolderones.Andthat’sthehopeofournation.1、Wheredidtheauthorspendthenightwhentheargumentshappened?A．Athome.B．Inahotel.C．Onatrain.D．Inarestaurant.2、Whowasreallywrongintheaccident?A．Therailwaystation.B．Thetravelagent.C．Themiddle-agedgentleman.D．Thesecondman.3、Facedwiththetwomen’sarguments,thepassengerswere.A．couriousB．excitedC．angryD．puzzled4、Whywaseveryonequietafterthearguments?A．Theyweretoosleepyinfact.B．Theywereafraidtospeakanything.C．Theyweretiredfromhardwork.D．Theyreachedtheirdestination.5、Readingthepassagegivesreadersasenseof.A．encouragementB．responsibilityC．disappointmentD．excitement22．（8分）Shesatatthepicnictablealone.Recess(休息)wasinfullswing.Sheremainedawkwardaroundherclassmates.Sheseemedunsureofwhattodoorsay,yetIcouldseehereyeslongingforacceptance.Manystudentshadalreadydecidedthatherfriendshipwouldnotbeworththeenergyrequiredtoovercometheawkwardness.Othersteasedher.Mostignoredher—exceptforone.Brianna,theclassclown,wasmakingtheotherstudentslaugh,asusual.“Brianna,doyouseeMollydownthere?Wouldyoumindwalkingdownthereandinvitinghertocomeupherewiththerestofus?”Briannasighed.Icouldtellshedidn’twanttosacrificepreciousminutesofherownrecesstodowhatIwasaskingofher,butIalsoknewherheart.Sheoftenthoughtofothersbeforeherself—ararecharacterforanyone,muchlessakid.Knowingthischoicewashardforher,IpulledoutaD-buck,ourclasscurrency.Thoughbribery(行贿)wasnottheidealwaytohandlethissituation,Ineededhercooperation.“Here,I’llpayyouforyourtime.”Sheofferedaninsinceresmile,graspedthegreenpaper,andheadeddownthehill.Astherestofthechildrenscreamedandlaughed,myeyeslockedonBriannaasshenearedthepicnictable.Mollycouldbedifficult,andIwouldn’thavebeensurprisedifshesentBriannabackalone,refusingherinvitation.Whensheencouragedherselftoastandingposition,Isighedwithrelief.Aminutelater,1felttaponmyshoulder.“Here,Mrs.D．”ShehandedmetheD-buck.“Why?”Iasked.“Ishouldn’tkeepthis.”Hereyesfelltoherfeet,guiltradiatingfromherquietvoice.“Idon’twantMollytothink1onlywenttogethersoIcouldearnamuck.She’smyfriend.”Amomentlater,theywerealllaughingagain,andwhoshouldIseeamongthem,laughingforthefirsttimethatweek?Molly.1、Accordingtotheauthor,whatwasMollylike?A．Sheignoredthejokesfromotherkids. B．Shefeltawkwardatbeingteased.C．Shedesiredtobeacceptedbyotherkids. D．Shehadnoenergytomakefriends.2、WhatdistinguishedBriannafromotherkids?A．Herclowntalent. B．Hercooperation.C．Herhonesty. D．Herkindness.3、HowdidtheauthorfeelasBriannawalkedtoMolly?A．Worried. B．Satisfied.C．Exicted. D．Confused.4、WhatwasthepurposeofBrianna’sreturningtheID-bucktotheauthor?A．TOavoidlosingitoneday.B．TOgetapurefriendshipwithMolly.C．TObribeherteacher.D．TO’escapefrombeingscoldedbyherteacher:23．（8分）NASAhasanewjoblisting,andit’snojoke.TheUSspaceagencyislookingfora“joker”tojointheirplannedmissiontoMars.AmissiontoMarsisnolaughingmatter.Onaverage,theredplanetis140millionmiles(225millionkilometers)awayfromEarth.Atriptherewouldtakearoundeightmonthsinasmallspacecraft.AndMarshasacommunicationsdelayof20minutes.Thismeansthatastronautswillhavetowait20minutesforareply,whenanemergencyhappens.“Whenyou’relivingwithothersinaconfinedspaceforalongperiodoftime,suchasonamissiontoMars,problemsarelikelytooccur,”JeffreyJohnson,ascientistattheUniversityofFlorida,toldtheGuardian.ThisisprobablywhyNASAwantsanastronautwithasenseofhumor.“Thesearepeoplethathavetheabilitytopulleveryonetogether,”Johnsonsaid.Instressfulsituations,perhapshumorisawaytoknowwearen’talone.Bylaughingtogether,weshareourstress.Thenwecanfocusonourjobsinsteadofjustworrying.Thereareotherexamplesofteam“clowns”.OneexampleisthejourneytotheSouthPoleledbyNorwegianexplorerRoaldAmundsen.Itwasadifficultjourney,fullofdanger.AdolfLindstrom,acookatAmundsen’steam,wasa“clown”.Hemadepeoplelaughthroughthewholejourney.AmundsenlaterwrotethatLindstromwasthemostvaluablememberoftheteam.Butifyou’rehopingthatyourfavoriteTVcomedianwillflytoMars,thatprobablywon’thappen.“Beingfunnywon’tbeenoughtolandsomebodythejob,”Johnsonsaid.“Theyalsoneedtobeanexcellentscientistandengineer.”Besides,theymustbeintopphysicalcondition.1、WhatisNASA’snewjoblisting?A．Afunnyengineer. B．Atalentedclown.C．Agoodcook. D．Apopularcomedian.2、Whatdoes“aconfinedspace”inParagraph3referto?A．Acrowdedspace. B．Anemptyspace.C．Anopenspace. D．Asmallspace.3、Howdoestheauthorthinkhumorcanhelpastronauts?A．Itcanstopthemfromfeelingworried.B．Itcanencourageteamworkonamission.C．Itcanhelpthemfeellesshomesick.D．Itcanhelpthemknowthemselvesbetter.4、Whatpointdoestheauthorwanttomakewiththeexampleofthecook?A．Whatexplorerseatontheirjourneyisveryimportant.B．Anamateurcanplayamoreimportantrolethanaprofessional.C．Humorouspeoplecancheerpeopleupindifficultsituations.D．AmissiontoMarsismoredifficultthanajourneytotheSouthPole.5、Whatcouldbethebesttitleofthepassage?A．KeepingtheSpiritsUpB．AMissiontoMarsC．ANewJobListingofNASAD．HumorousAstronautsinNASA24．（8分）Theworld’srichestmanmightseemtohaveitall,butBillGateshasoneregret.Theself-madebillionairesaidhefeltstupidfornotknowinganyforeignlanguages.SpeakinginhisthirdAskMeAnythingquestion-and-answersessionforonlineforumReddit(红迪网),theMicrosoftfoundersaidthathewishedhespokeFrench,ArabicorChinese.Hesaid:“ItookLatinandGreekinhighschoolandgotA’sandIguessithelpsmyvocabulary.Ikeephopingtogettimetostudyoneofthese—probablyFrenchbecauseitistheeasiest.IdidDuolingoforawhilebutdidn’tkeepitup.”Gates,whoisworth$79.3billion,praisedFacebookfounderMarkZuckerbergforsurprisinganaudienceinBeijingwhenhespokefluentChinese.“MarkZuckerbergamazinglylearnedChineseanddidaQ&AwithChinesestudents—unbelievable,isn’tit?”hesaidThisisn’tthefirsttimeforGatestoadmithisregretoverlanguage.Healsoshowedhishabitsathomeandpersonalinsights.LastFebruary,Gatessaidhelikestodothedisheshimself—tohisownspecialstandardseverynightandalsotoldtheinterviewerthathiswife,Melinda,wouldlikelywantSamuelL.Jacksontoplayherhusbandinabiopic(传记片).Healsoadmittedthathewouldpickupa$100billifhefounditonthestreet.AshetookthetopspotonForbes(福布斯)28thAnnualBillionaireslistlastyearforthefourthtime,hesaidheisprettybasicwhenitcomestospendingonclothesandfood,butthatheenjoysinvestinginshoesandracquets(球拍)whenheplaystennis.Whenaskedalifelessonhehadtolearnthehardway,thebillionairesaidstayinguptoolateisahabitheisstilltryingtobreak.“Don’tstayuptoolateevenifthebookisreallyexciting.Youwillregretitinthemorning.Pamstillworkingonthisproblem.”hesaid.1、Whichofthefollowingcanbethebesttitleforthepassage?A．AnInterviewwithBillGates B．HowBillGatesSucceededC．BillGates’Regret D．TheRichestBillionaire2、TheunderlinedpartinParagraph8mayactuallymeanthat_____.A．itisimportanttolayagoodfoundationoflifeB．foodandclothingarebasicneedsforpeople’slifeC．hedoesn’tspendmuchmoneyonfoodandclothesD．henevercaresaboutbuyingfoodandclothing3、WhatadvicedidBillGatesgive?A．Avoidstayinguptoolate.B．Beagoodlanguagelearner.C．Dothedishesyourselfathome.D．Pickupthe$100billsinthestreets.4、Whichofthefollowingistrueaccordingtothepassage?A．BillGatesisalsothefounderofFacebook.B．BillGatestoppedthelistofForbes28times.C．BillGateswasgoodatlearninglanguagesinhighschoo1.D．BillGates’wifewantsSamueltoplayagamewithGates.25．（10分）Statistically,airtravelisbyfarthesafestwaytotravelandyoucanmakeflyingevensafer,justbyfollowingthesesimplerules．Asyourchancesofbeinginvolvedinanairaccidentarepracticallynil（零）,manyoftheserulesconcernwhatyoushouldandshouldn’tdotomakeyourjourneysaferwhenyouareintheair.●Flyonnon-stoproutesMostaccidentsoccurduringthetakeoff,climb,descentandlandingperiodofaflight,soflyingnon-stopreducesyourexposuretothesecomplicatedprocedures.●ChooselargeraircraftAlthoughsmallaircraftshaveverygoodsafetyrecords,thosewithmorethan30passengerseatsaredesignedtocomply（遵守）withmuchstricterregulationsandaretestedmoreregularlytomakesuretheystillcomply.Also,intheunlikelyeventofaseriousaccident,largeraircraftsprovideabetteropportunityforpassengersurvival.●Payattentiontothepre-flightsafetybriefing（简报）Theinformationmayseemtoberepeated,butit'sworthlisteningtotheflightattendants.Andevenifyouhaveflownbefore,itdoesn'tmeanyouknoweverythingabouttheaircraftyou'reon,suchasthelocationoftheclosestemergencyexit.●StorethingssafelyNeverputveryheavyarticlesintheoverheadstoragebins.Theymayfalloutwhensomeoneopensthebinandcauseinjury.Also,thebinmaynotbeabletoholdheavierobjectsduringtheviolentmovementsofaircausedbythewind.●KeepyourseatbeltfastenedwhileyouareseatedCabincrewalwaystellyouthis,butit'simportant.Youcouldbeseriouslyinjurediftheplanehitstheviolentmovementofairunexpectedly.Alwaysfastenyourseatbeltifyouaretoldto.Thegeneralruleofflyingisthis:Ifyouaretoldtodosomething,doitfirstandaskquestionslater.●LettheflightattendantpouryourhotdrinksFlightattendantsaretrainedtohandlehotdrinkslikecoffeeorteainacrowdedaisleonamovingaircraft,soallowthemtopourthedrinkandhandittoyou.Neverasktotakeacoffeepotfromoneofthem.1、Whatisthegeneralreasonfortheseairsafetyrules?A．Whattodointheeventofacrash.B．Howtoavoidsuddenchange.C．Howtoimprovesafetywhileyouareflying.D．Howtoavoidinjury.2、Theunderlinedphrase"Thegeneralrule"inthefifthrefersto.A．anythingtheflightstafftellyoutodoB．generalsafetyadviceC．walkingaroundtheplaneD．pouringhotdrinks3、WhichofthefollowingisNOTtrue?A．largerplaneshavemoresafetychecksandaresaferinanaccident.B．Take-offsaresaferonnon-stopflightsthanlanding.C．Everyaircraftisdifferent,sothesafetyproceduresmaybedifferent.D．Seatbeltsshouldbeworntoprotectagainstsuddenchange.4、Thebesttitleshouldbe.A．ThesafestwaytotravelB．AirsafetytipsC．Non-stopRoutesD．Howtotakeaplane第三部分语言知识运用（共两节）第一节（每小题1.5分，满分30分）阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项．26．（30分）Ihadn’tevengotachancetoenterthestorebeforeanAfricanAmericanwomanapproachedmeandaskedifIwouldhelpherreturnanitem.Theitemshehad1wasintendedforherdaughter,butshehadalreadyreceiveda2one.Thelady3toexchangetheitemforsomethingelseinthestorebutshewastoldsheneededanID4thedealcouldnottakeplace.Iwenttothe5withthewomansowecouldusemyID．Thesalesassociateimmediatelystarted6herofaskingthefirst7personshesawtohelpher.Althoughthatwas8,Ididn’tunderstandwhyit9Afterall,noteveryoneisgiventheopportunityto10anIDinthiscountry.Then,weaskedtospeakwithamanager,whoexplainedthattherewasno11toreturntheitemwithoutareceiptandthenwentontosaythewomancouldnot12shepurchasedtheitem.“13I,ayoungwhitefemale,weretoenterthestoreandrequestyoutomakeanexchangewithoutareceipt,Iwouldnotbe14theprivilege—asIhaveprooffromthepast.”Isaid.Hemusthaverealizedatthatmomentwhathehaddone,becausehe15toexchangetheitem.Therearemanyvaluablelessonsinthestory.Thefirstistohelpastrangerinneed.I16whenthewomanaskedformyhelp,but17doIactuallyhave?”Ihadnone,soIhelpedher.Thesecondlessonisnottojudgeabookbyits18Thewomanlookedpoor,butshe19thesametreatmentasanyoneelsedoes.1、A．purchasedB．shownC．lostD．mended2、A．sameB．popularC．similarD．different3、A．managedB．wantedC．refusedD．promised4、A．forB．orC．andD．so5、A．counterB．departmentC．marketD．window6、A．warningB．informingC．remindingD．accusing7、A．fairB．familiarC．impossibleD．random8、A．wrongB．trueC．reasonableD．meaningful9、A．matteredB．happenedC．passedD．worked10、A．leaveB．payC．findD．obtain11、A．requestB．placeC．wayD．need12、A．answerB．proveC．supportD．admit13、A．UnlessB．AndC．InsteadD．If14、A．orderedB．askedC．deniedD．given15、A．agreedB．preparedC．failedD．remembered16、A．struggledB．wonderedC．hesitatedD．nodded17、A．totallyB．graduallyC．hardlyD．quickly18、A．feelingsB．goalsC．reasonsD．ideas19、A．designB．coverC．contentD．price20、A．deservedB．requiredC．receivedD．appreciated第二节（每小题1.5分，满分15分）阅读下面材料，在空白处填入1个适当的单词或括号内单词的正确形式。27．（15分）IfyougotoZhuguanlongvillageinFujianProvince,youwon'tmissatwo-floorlibrary.Itisthefirstlibrarythere,1．hasbeenopenforfreefor44years!Thecreatorisoneofits2．(village)—LiuShijiang.WhydidLiuopenthislibrary?Backin1974,Liu3．(finish)hisstudyinhighschool.Atthattime,villagerswouldaskhimtotellstories.Butitwasn'tlongbeforeLiu'sstoriesrunout.Besides,manyvillagersplayedmahjongandcardstokillthetime."HowcanIgivemyselfandothersahealthierpastime?"Liuasked4．(he).That'swhenhedecidedtobuysomebooks.Hesoldtheonlypigofhisfamilyfor200yuanandborrowedanother400yuan5．(buy)books,bookshelvesandchairs.Andoneofhisrooms6．(make)intoalibrary.As7．result,moreandmorevillagersgatheredtheretoreadbooks,suchasstorybooksorworksabouthowtogrowbettercrops.Overtheyears,Liumetwithmanykindsofdifficulties；,8．hehasbeenabletoovercomethemandkepthislibraryopen.Amongreaderstherearethebook-lovingstudentsandteachers."Itisthebusiesttimeforthelibrarywhenthechildrenareonwinterorsummerholidays,"saidLiu."Now,histwo-floorlibraryhasmorethan7,000booksandacomputer,aDVDrecorder;andKaraoke,9．(offer)moreentertainmentandlearningchoicestothevillagers."Ihavedevotedmypastyearstothelibrary,andIwillkeephercompanyinthefollowingyears,saidtheman,nowinhis10．(sixty).第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）假如英语课上老师要求同桌之间交换修改作文,请你修改你同桌的以下作文,文中共有10

处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加,删除或修改。增加:

在缺词处加一个漏字符号(/\),并在其下面写出该加的词。删除:

把多余的词用斜线(\)

划掉。修改:

在错的词下划一横线,并在该词下面写出修改后的词。注意:1.每处错误及其修改均仅限一词:2.只允许修改10处,多者(从第11处起)

不计分。IstillrememberthefirstdayIcometothisnewschool.Everythingwasnewtome，whatmademerealizeIwasnolongerasmallchild.Ihadtodependonme.Luckily，Imadeseveralgoodfriend.Theirinterestsweresimilarwithmine.IhadgreatEnglishteacher,Maggie.SheletmeknowtheimportantofEnglish.SoIdecidedtolearnEnglishhardly.Althoughitwasverydifficultatfirst,butwiththehelpofmyteacher,Imaderapidlyprogress.Justastheoldsayinggoes,“Wherethereisawill,thereisaway.”第二节书面表达（满分25分）29．（25分）近来，共享单车(sharedbikes)成为中国时尚，它因方便、环保而广受好评，然而共享单车也出现了许多弊病，例如乱停放、人为破坏、非法占有等。假如你是光明中学的学生李华，请你将有关情况反映给政府相关部门并阐述你的看法。内容要点包括：1.共享单车的问题；2.出现问题的原因；3.解决问题的意见或建议。注意：1.词数100左右；2.可以适当增加细节，以使行文连贯。DearSir,__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Yours,LiHua

参考答案第一部分（共20小题，每小题1.5分，满分30分）1、C2、B3、B4、C5、B6、D7、B8、C9、B10、C11、A12、B13、C14、B15、A16、A17、C18、B19、A20、C第二部分阅读理解（满分40分）阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。21、1、C2、B3、C4、A5、A22、1、C2、D3、A4、B23、1、B2、D3、B4、C5、C24、1、C2、C3、A4、C25、Spaceiswhereourfutureis—tripstotheMoon,Marsandbeyond.Mostpeoplewouldthinkthatasidefromcomets(彗星)andstars,thereislittleelseoutthere.But,sinceourspacejourneystartedwehaveleftsomuchtrash（垃圾）therethatscientistsarenowconcernedthatifwedon'tcleanitup,wemayallbeinmortal（致命的）danger.Thefirstpieceofspacejunkwascreatedin1964,whentheAmericansatelliteVanguardIstoppedoperatingandlostitsconnectionwiththegroundcenter.However,sinceitkeptorbitingaroundtheEarthwithoutanyconsequences,scientistsbecameincreasinglycomfortableabandoning（抛弃）thingsthatnolongerservedanyusefulpurposeinspace.Itisestimated（估计）thattherearenowover500,000piecesofman-madetrashorbitingtheEarthatspeedsofupto17,500milesperhour.Thejunkvariesfromtinypiecesofpaintchippedoffrocketstocameras,hugefueltanks,andevenodditemslikethemillion-dollartoolkitthatastronautHeidemarieStefanyshynPiperlostduringaspacewalk.Themajorproblemwiththespacetrashisthatitmayhitworkingsatellitesanddamagetravelingspacecraft(飞船).Moreover,piecesofjunkmaycollide（碰撞）witheachotherandbreakintopieceswhichfallbacktotheEarth.Toavoidthis,scientistshaveinventedseveralwaysforclearingthesky.Groundstationshavebeenbuilttomonitorlargerpiecesofspacetrashtopreventthemfr