2021-2022学年黄石二中、鄂南高中、鄂州高中三校高三第一次模拟考试英语试卷含答案

2021-2022高考英语模拟试卷注意事项：1．答卷前，考生务必将自己的姓名、准考证号填写在答题卡上。2．回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑，如需改动，用橡皮擦干净后，再选涂其它答案标号。回答非选择题时，将答案写在答题卡上，写在本试卷上无效。3．考试结束后，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．Intheforest,soundisthebestmeansofcommunicationoverdistance________incomparisonwithlight,itwon'tbeblockedbytreeswhentravelling.A．whileB．becauseC．whenD．though2．Wehavestrong________forbelievingthatthenewly-inventedmaterialisnotonlypopularbutalsoamonumenttotheeco-friendlylifestyle.A．grounds B．reasons C．causes D．purposes3．Ifyouwanttoseeadoctor，youfixadatewithhimaheadoftime.Thatisacommon________intheUSA．A．viewB．exerciseC．practiceD．reality4．Thereisawide________ofreferencebookstobefound,so________youlookforsomematerialneeded,youcanturntome.A．kind;thelasttime B．sort;everytimeC．variety;nexttime D．type;themoment5．—IfeelsonervousabouttheNationalEnglishSpeechCompetitiontomorrow.—.A．Ireallyenvyyou B．GladtohearthatC．Soundsgreat D．Takeiteasy6．—Whereonearthhavetheygone?—Ihavenoidea,butIwishI.A．know B．knew C．wouldknow D．wouldhaveknown7．—Thankyouverymuchforeverything．You'vebeensohelpful.—__．JustletmeknowifthereisanythingelseIcandoforyou． A．Withpleasure B．Thepleasureismine． C．Pleasedon'tsayso D．No,thanks8．—Gotyourdrivinglicense?—No.Itoobusytohaveenoughpractice,soIdidn’ttakethedrivingtestlastweek.A．wasB．amC．havebeenD．hadbeen9．－You’vebeencoughingsobadlyrecently.Giveupsmoking,please.－_______.IthinkIamaddictedtoit.A．Itcan’tbehelped B．GoodideaC．Sofar,sogood D．Farfromit10．—Iknowitisreallyalottoask,butcanIuseyourapartmentduringthesummer?—________.Ihappentobeoutoftown.Itisallforyourtaking.A．BehaveyourselfB．BemyguestC．HavefunD．Takecare11．TheOxfordEnglishDictionaryisnecessaryforlearningEnglish,soyou'dbetterbuy___.A．this B．that C．it D．one12．InthevirtuallaboratoryenvironmentcreatedintheVRapp,studentscan________aparticularexperimentbeforedoingtheminareallab.A．revealB．reserveC．previewD．provide13．IfeelIamaswell-behavedandascarefulasmydeskmate,but_______Ialwaysfallbehind?A．howabout B．howcomeC．whatif D．whatfor14．Bytheendoflastweek,600peoplefrom50countriestoattendthemeeting，withnearlyhalfcomingfromtheUnitedStates，GermanyandBritain.A．hadregisteredB．haveregisteredC．registeredD．wereregistered15．HadMarynotbeenhurtinthecaraccident,________thenextweek’smarathon.A．shewouldrun B．shewouldhaverunC．shewillrun D．shemusthaverun16．Nearlyalleducatorsbelievethatachallengingsituationcanoften______thebestqualitiesofaperson.A．cheerup B．takeoverC．bringout D．putaway17．Itisafoolishactto________notesduringatestasyouwillbeseverelypunished.A．stickto B．referto C．keepto D．pointto18．--Ittookmeeightyearstobuildupmybusiness,anditalmostkilledme.--Well,youknowwhattheysay..A．ThereisnosmokewithoutfireB．Nopains,nogainsC．AllroadsleadtoRomeD．Practicemakesperfect19．Withnoonethem，thetwothievesstoleintothehouse．A．watchB．watchingC．watchesD．watched20．—Iamsearchingoneonlineshoppingsiteafteranotherforacomputer.—So__________IbeforeIdecidedtobuyanewcamera.A．had B．have C．am D．would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）HistorianTomHollandistheaward-winningauthorofRubicon,PersianFireandMillennium.Heappearsregularlyonradio,TVandinprint.HislatestbookDynastyispublishedinpaperbackbyAbacus.MoominsummerMadnessByToveJansoonWhatIloveaboutthisbook,asachildandstilltoday,isitsmixofthefantasticalandnormal.Ontheonehand,it’saboutafamilyandtheirfriendsallenjoyingthemselves,quitehappynotdoingmuch.Ontheotherhand,it’saboutcharactersthatcanchangeintooddshapes,magicianscomingdownfromthemoonandpeculiarcreaturesemergingfromtheroof.Thatmixofthefamiliarandtheextraordinaryinformsallmywriting.TheHistoriesByHerodoTusBythetimeIwas12,IwasobsessedbyAncientGreeceandRome.Atfirst,IfoundtheearlysectionofTheHistoriesarealgrindbecauseit’slikealongshaggydogstorythatnevergetstothepoint.InthesecondhalfIwasrewardedwiththestoriesI’dbeenwaitingfor,likethebattlesofMarathon,SalamisandThermopylae.Overtheyears,IcometovaluetheinfectiouscuriosityofthefirsthalfandtheportraitoftheworldinthefifthcenturyBCseenthroughtheeyesofthisextraordinaryGreekhistorian.ADistantMirrorByBarBaraWTucHmanTuchman’sbookTheGunsofAugustwonthePulitzerPrize,butit’sthisslightlylesswell-knownworkthatprovidedmewitharolemodelformyownwriting.Bothscholarlyandinteresting,it’saportraitofthe14thcenturyinWesternEuropeandvividlyevokesmedievalcivilizationbuffetedbycataclysms:theBlackDeath,thePeasants’RevoltandtheGreatPapalSchism.IfeltIknewwhatitwastodieoftheplagueortohaveaswordputthroughme—realstoriestoldremarkably95、TomHollandnowfindsthefirsthalfofTheHistories___________.A．offthepoint B．culture-centeredC．reallyboring D．quiteentertaining1、WhichbookdoesTomHollandappreciateandtrytocopyitsstyle?A．TheHistories B．ADistantMirrorC．TheGunsofAugust D．MoominsummerMadness22．（8分）IsItWorthBuyingOrganicFood?Organicfood,grownwithoutartificialchemicals,isincreasinglypopularnowadays.Consumershavebeenwillingtopayuptotwicemoreforgoodswithorganiclabels(商标).However,ifyouthinkpayingalittlemorefororganicfoodgetsyouamorenutritiousandsaferproduct,youmightwanttosaveyourmoney.AstudyledbyresearchersatStanfordUniversitysaysthatorganicproductsaren'tnecessarilymorenutritious,andthey'renolesslikelytosufferfromdisease-causingbacteria,either.Thelatestresults,publishedintheAnnualsofInternalMedicine,suggestthatbuyersmaybewastingtheirmoney."Wedidnotfindstrongevidencethatorganicfoodismorenutritiousorhealthier,"saysDr.CrystalSmith-SpanglerfromStanford."Soconsumersshouldn'tassumethatonetypeoffoodhasalowerriskorissafer."Fortheirnewstudy,Smith-Spanglerandhercolleaguesconductedareviewoftwocategoriesofresearch,including17studiesthatcomparedhealthoutcomesbetweenconsumersoforganicagainsttraditionalfoodproducts,and223studiesthatanalyzedthenutritionalcontentofthefoods,includingkeyvitamins,mineralsandfats.Whiletheresearchersfoundlittledifferenceinnutritionalcontent,theydidfindthatorganicfruitandvegetableswere20%lesslikelytohavechemicalsremainingonthesurfaces.Neitherorganicnortraditionalfoodsshowedlevelsofchemicalshighenoughtogobeyondfoodsafetystandards.Andbothorganicandtraditionalmeats,suchaschickenandpork,wereequallylikelytobeharmedbybacteriaatverylowrates.Theresearchersdidfindthatorganicmilkandchickencontainedhigherlevelsofomega-3fattyacids,ahealthyfatalsofoundinfishthatcanreducetheriskofheartdisease.However,thesenutritionaldifferencesweretoosmall,andtheresearcherswereunwillingtomakemuchofthemuntilfurtherstudiesconfirmthetrends.Organicfoodisproducedwithfewerchemicalsandmorenatural-growingpractices,butthatdoesn'talwaystranslateintoamorenutritiousorhealthierproduct.TheU.S.DepartmentofAgriculture(USDA)statesthat"whetheryoubuyorganicornot,findingthefreshestfoodsavailablemayhavethebiggesteffectontaste."Freshfoodisatleastasgoodasanythingmarketedasorganic.1、Thenewresearchquestionswhetherorganicfood__________.A．shouldreplacetraditionalfood B．hasbeenoverpricedbyfarmersC．isgrownwithlessharmfulchemicals D．isreallymorenutritiousandhealthier2、Smith-Spanglerandhercolleaguesfoundthat__________.A．organicfoodcouldreducetheriskofheartdiseaseB．traditionalfoodwasgrownwithmorenaturalmethodsC．bothorganicandtraditionalfoodtheyexaminedweresafeD．therewasnotapresenceofanyformsofbacteriainorganicfood3、Whichofthefollowingisrelativelyhealthieraccordingtothepassage?A．Organicchickenandpork. B．Organicmilkandchicken.C．Traditionalchickenandpork. D．Traditionalfruitandvegetables.4、Whatistheauthor’sattitudetowardorganicfood?A．Sceptical B．NeutralC．Unconcerned D．Approving23．（8分）ThesummerbeforeseventhgradeourfamilymovedandIsaidgoodbyetoeverythingthatwasfamiliar.Formyparentsitwasagoodthingbecauseitmeantowningahomeforthefirsttime.ButitmeantthatIdhavetochangeschoolsandthatputsomebutterfliesinmystomach.Onthefirstdayofschool,kidsjammedtheschoolgrounds.That’swhenImetBarbara.Wemadeanervousconversationandsoonlearnedwewereinthesameclass.Shewasfunnyandwehadalotincommon.Butshewasverycriticalofothersandsometimesofme.Shemadefunofmybushyhair,mybigglassesandtheclothesIwore.Butitseemedasthoughthethingswehadincommonweremoreimportantthantheannoyances.Thegirlsinthe“popular”crowdhadalsobeenexposedtohersharptongue.Oneday,oneofthegirlsapproachedmewhileIgatheredmybooks.“Wereallylikeyou,”shesaid.“Theonlywayyoucanplaywithus,though,isifyoukeepyourdistancefromBarbara.”Werethosegirlsonlytryingtomaketroublebetweenthetwoofus?Wouldtheywatchmedump(抛弃)Barbaraandthendumpmeforlaughs?FromthecomerofmyeyeIfoundtwooftheothergirlsfromthegroup.Theywerewatchingmeandgiggling(咯咯地笑).IwonderedifIwascoolenoughforthem.Ididn’twanttomakethechoicetheywereforcingmetomake.SoIshookmyheadandsaid,“Idon’tthinkso.IlikeBarbaraandwe’regoodfriends.”ThenIgatheredmybooksandranaway.EventhoughBarbarastillannoyedmeattimes,IknewI’ddonetherightthing.I’dmademyowndecisionaboutagirlwhohadbefriendedmewhenIbadlyneededafriend.WhenshemovedthefollowingyearImissedherfriendshipterribly.ButwhatIkepthasneverleftme—myself-respect.1、Whatdoestheunderlinedphrasemean?A．Gotmetofeelmoreexcited.B．Leftmeinastateofdesire.C．Broughtmemoreexpectation.D．Mademehaveanervousfeeling.2、WhatdoweknowaboutBarbara?A．Shewasagirlwithasharptongue.B．Shewaspopularwithkidsatschool.C．Sheofferedothershelpincriticalmoments.D．Shewasverycriticalofherowndress.3、Whatwasthewriteraskedtodobyonegirl?A．Tojointhe“popular”crowd.B．ToendherfriendshipwithBarbara.C．ToinviteBarbaratohangoutwiththem.D．Topretendtobecoolinthe“popular”crowd.4、Whatlessondidthewriterlearnfromherexperience?A．Keepfarawayfromthe“popular”group.B．Avoidmakingfriendswithanannoyingperson.C．Keepself-respectinmakingyourowndecisions.D．Sharecommoninterestwithyourfriends.24．（8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．Howtotakeaplane25．（10分）Flyingforalongtime,youfinallyarriveattheplacewhereyoucanrelax—yourhotelroom.Nowyouthrowyourbagonthebed,turnontheTVandwatchaninternationalnewsprogrammeonasatellitechannelprobablyfromUKortheUSA．ThemaininternationalbroadcastersareBBCWorldandCNN.Withanaudienceofover1.5billionpeople,thesearepopularchannelsthatoffergood-qualitynewsprogrammes.Inbothcompanies,thejournalistsareexperiencedwritersthatproducejournalismofahighstandard.However,therearealternativenewschannelswhichpeoplewatchbecausetheywantalesstraditionalornon-Westernviewonworldevents.RussiaTodayandAlJazeeraInternational,anArabiccompany,areinternationalchannelsthatbroadcastinEnglish.Bothcompaniessaytheygiveafreshviewonbigstories,andtheirexperiencedjournalistsoftenreportfromplaceswhereWesternjournalistsdonotwork,andsotheygiveusstoriesthatwedon’tnormallysee.TheInternetoffersmorevariety.OneWorldTVisanInternetsitewhereyoucanfindstoriesaboutthedevelopingworldandhumanrights,ratherthantheusualstoriesaboutUSpoliticsandbusiness.Thewritersforthiscompanyareoftenlocalpeoplewhowritethestoriesforfree.Thisnon-professionaljournalismisincreasing,anditcertainlyoffersmorechoices.Thisincreaseincitizenjournalismmeansthatyoucanwritethenews,too.Mainnewsbroadcastersoftenusephotographsandstoriesthatmembersofthegeneralpublicsendtothem,especiallywhenthereisadramaticbreakingnewsstory.Besidesthis,someblogsarepopularsourcesofnews,andthewebsiteNowPublicletsyouwritestoriesusinginformationyoucangetfromanywhere,includingsiteslikeYoutube,FlickrandTwitter.1、Thefirstparagraphismeantto.A．offerasuggestionB．giveawarningC．explainareasonD．introducethetopic2、Itcanbelearnedfromthetextthatmoreandmorepeoplewill.A．prefertoreadlocalnewsB．paymoreattentiontoworldnewsC．startacareerincitizenjournalismD．giveupwatchingTVnewsprogrammes3、Whatwouldbethebesttitleforthetext?A．TheLatestLocalNewsB．MoreChoicesforNewsC．TheEndofTVNewsD．TraditionalWorldNews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）Areyouamanoramouse?Whenpeopleaskthisquestiontheywanttoknow1youthinkyouarea2personoracoward(懦夫).Butyouwillneverreallyknowtheanswertothisquestion3youaretestedinreallife.Somepeople4theyarebravebutwhentheycomefacetofacewithreal5,theyactlikecowards.Othersthinkofthemselvesascowards,butwhentheymeetdanger,theyactlike6.Lennyhadalwaysthoughtofhimselfasa7person.Hegotworriedbeforeexaminations.Heworriedabouthisjobandhealth.Allhewantedinlifewastobesafeandhealthy.8,onJanuary15th,2002,aplanecrashedintothePotomacRiverinWashington.Lennywenttotherivertoseewhatwashappening.Hesawawomaninthe9water.Lennydidnotfeelafraid.Hekeptvery10anddidaverydangerousthing.HejumpedintothePotomac,11tothewoman,andkeptherhead12thewater.Seventy-eightpeoplediedthatday.ThankstoLenny,itwasnot13.Whenyouareinavery14situationandfeelafraid,thebodyautomaticallyproducesachemicalintheblood.Thechemicaliscalledadrenalin（肾上腺素）.15adrenalininthebloodsystem,youactuallyfeelstrongerandstrongerandare16tofightorrunaway.However,whenyouareabsolutelyterrified,thebodycanproducetoomuchadrenalin.Whenthis17,themuscles（肌肉）becomeveryhardandyoufindyou18moveatall.Youarethenparalyzed(使无能为力)withfear.Thisis19whenweareveryfrightened,wesometimessaywe’re“petrified(惊呆的)”.ThiswordcomesfromtheGreekword“petros”,whichmeans“stone”.Weare20frightenedthatwebecomestonelike.1、A．how B．neither C．whether D．either2、A．brave B．real C．hard D．certain3、A．when B．until C．after D．once4、A．realize B．find C．think D．agree5、A．life B．question C．mouse D．danger6、A．soldiers B．mice C．heroes D．cowards7、A．useful B．brave C．nervous D．terrible8、A．So B．Therefore C．Then D．Actually9、A．fresh B．poisonous C．warm D．ice-cold10、A．nervous B．calm C．frightened D．excited11、A．went B．helped C．spoke D．swam12、A．in B．under C．above D．from13、A．anaccident B．amistake C．seventy-eight D．seventy-nine14、A．dangerous B．comfortable C．different D．favorable15、A．With B．Without C．For D．Like16、A．afraid B．unable C．ready D．anxious17、A．gets B．disappears C．happens D．goes18、A．needn’t B．can’t C．mustn’t D．shouldn’t19、A．where B．how C．because D．why20、A．really B．very C．such D．so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）MymotherandmybrotherweretakingatriptoWashington,D．C．Theycamebackwiththemost1．(amaze)storyIhaveeverheard!WhentheypassedbyNewYork,theirtrainfailedtowork2．(proper),theconductorsaskedeveryonetomoveforwardtoanothertrain.Wheneveryone3．(seat),mymotherrealizedshedidn’thaveherhandbag,in4．washermoney,tickets,creditcardandlicense.Sherushedtoaconductor.“Excuseme,Ileftmybagontheothertrain.Canyoustopthetrain?”Theconductorreplied,“Oh,I’msorry,5．wecannotletyouoff.”Mymomquicklypickeduphercellphone,6．onlythingshehad,andstartedcallingsomeoneforhelpbut7．vain.Luckily,whenthetrainfinallystoppedinDelaware,amanleftthetrainandhandedmymom$2.Mymotherthankedhimandfeltgratefulforhis8．(kind).Shegottheman’saddressandpromised9．(find)awaytopayhimback.MymotherandmybrotherfinallyarrivedinWashington,D．C．,butdidnotgettodoallthethingsas10．(plan).Theygottotakeafewlikerides,buysouvenirs,andmore.Theymadethebestoftheworstvacation!第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。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。Lastamonth,wetookanimportantexamination,whichwastoprepareusbetterfortheCollegeEntranceExamination、Somegottheirsatisfyingscoreswhileothersweredisappointedwiththerankcomparingwiththeirefforts、Afterwards,notonlydoourteachershelpusanalyzetheexaminationwithappropriateandsciencemethodsbutalsoourparentsgaveusmorepatienceandencouragement、Thenwemanagedtorefreshusintoabetterstate、Nowwehavereallyrealizedthatthepurposesofsuchanexaminationweretohaveagoodgraspofthelearnedknowledgeandhelpedusadaptthefutureexaminationbetterbothskillfullyandmentally、However,wefirmlybelievethatwewillfacethenextexaminationmorepositivelyandconfidently、Thoughwedevoteourselvestothestudy,wewillrealizeourdreamsoonerorlater、第二节书面表达（满分25分）29．（25分）假定你是李华，ChinaDaily最近拟刊登介绍中国传统文化的文章，请用英语给编辑写封信，谈谈自己的想法，要点如下：1.在你看来，最具中国特色的传统文化的是什么？(剪纸、京剧、功夫、孔子文化……)2.此传统文化对于中国的意义；3.我们应该如何更好地保护此传统文化？(不少于两点)注意：1.词数100左右；2.可以适当增加细节，以使行文连贯。Deareditor,______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________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、B2、A3、C4、C5、D6、B7、B8、D9、A10、B11、D12、C13、B14、A15、B16、C17、B18、B19、B20、A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、95、D1、B22、1、D2、C3、B4、A23、1、D2、A3、B4、C24、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）witheachothera