北京市顺义区市级名校2024届高三第三次模拟考试英语试卷含解析

北京市顺义区市级名校2024届高三第三次模拟考试英语试卷考生须知：1．全卷分选择题和非选择题两部分，全部在答题纸上作答。选择题必须用2B铅笔填涂；非选择题的答案必须用黑色字迹的钢笔或答字笔写在“答题纸”相应位置上。2．请用黑色字迹的钢笔或答字笔在“答题纸”上先填写姓名和准考证号。3．保持卡面清洁，不要折叠，不要弄破、弄皱，在草稿纸、试题卷上答题无效。第一部分（共20小题，每小题1.5分，满分30分）1．Itrainedheavilyovernightandnotuntilthismorning__________.A.haditstopped B．diditstopC．stoppedit D．itstopped2．AfternineyearsworkingtoprotectSiberiantigers,YangJun_____hiseffortsrecognizedattheannualawardceremonyinBeijingwherehewasnameda"wildlifeprotector".A．had B．hadhadC．hashad D．has3．—Ikeeponmeetingwithdifficultiesintheexperiment.Icanhardlygoon.—Wheretherearedifficulties,therearewaystogetoverthem.________A．Suityourself. B．GoodforyouC．Pullyourselftogether! D．What’sthedeal?4．—Whatamess!You’realwaysthrowingthingsabout.—Don’tbe____,Mum.Iwilltidyitupnow.A．hotunderthecollarB．oncloudnineC．offthetopofyourheadD．downinthedumps5．—WhendidyoureturnlastFriday?—Itwasnotuntilmidnight______itwasraininghard.A．when B．whichC．that D．before6．Bothmenhavebeen_______tolifeimprisonmentbecauseofrobbery.A．choked B．condemnedC．consisted D．convinced7．That’s

far

morethan

the

number

that

have

actually

______

inrecentyears.A．come

to

lightB．cometolifeC．comeacross8．_______manyChineseholidaysaredirectedtowardsservicesrememberingancestors,theChingMingFestivalisbeyonddoubtthelargest.A．Unless B．SinceC．Once D．While9．---How’syourtouraroundtheNorthLake?Isitbeautiful?---It________be,butitisnowheavilypolluted.A．willB．wouldC．shouldD．must10．--Wheneveryouwantagoodmeal,cometomyrestaurantandeatforfree.--Believeme.Thatisan________Iwillnotrefuse.A．approach B．offerC．idea D．instruction11．Greatpity!Hisillnessis________thetreatmentavailablesofar.A．within B．above C．about D．beyond12．—Doyou________readyforthespringouting?—No,Istillhavetobuysomefruit.A．everything B．anything C．something D．nothing13．—Whynottalkwithyourparentsaboutyourwillingnesstoattend2017PekingUniversitySummerCamp?—Itried____togetthemtolistentome.A．intime B．invainC．inneed D．incase14．Theoldcouple,________countrylife,wereunwillingtomovetothecitytolivewithhisson.A．accustomedto B．buriedinC．addictedto D．exposedto15．Youthisaperiodofourlifeweseenolimittoourhopesandwishes.A．where B．thatC．what D．when16．SometimesIactasalisteningearforfellowstudents________whatisbotheringthem.A．totalkover B．talkedoverC．talkover D．havingtalkedover17．Ifthenewsecuritysystem______intoeffect,suchaccidentswouldneverhavehappened.A．wouldbeput B．wereput C．shouldbeput D．hadbeenput18．The114colorfulclayWarriors____atNo.1pit,______inheightfrom1.8mto2m,haveblackhair,green,whiteorpinkfaces,andblackorbrowneyes.A．unearthed;rangingB．unearthing;rangingC．unearthed;rangedD．areunearthed;areranging19．—CanIpaythebillbycheck?—Sorry,sir.Accordingtotherulesofourhotel,thepayment______bemadeincash.A．shallB．needC．willD．can20．Youcan’timaginehowexcitedwewere________thatourschoolmateshadwonthefirstplaceinNationalRobotCompetition.A．learning B．havinglearnedC．tobelearning D．tolearn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）Thediscussiononrenewableenergyhasbeengoingonforatleastadecadeandpeoplehavereliedonfossilfuelsalmostentirelyformorethanacentury.However,thesituationwhenfossilfuelswerethemostefficientandthecheapestsourceofenergyhasbeenleftfarinthepast.ManycountriessuchasGermanyandSwedenhavealreadymadesignificanteffortstofixthissituation,employingnumerouspowerplantsworkingontherenewableresourcesofenergy.Themosteffectiveamongtheseresourcesisgeothermal（地热的）energy.Geothermalenergydoesnotdependontheworld’seconomicandpoliticalsituationasstronglyasfossilfuelsdo.Besides,extracting（提炼）fossilfuelsaddstothepriceofenergyproducedfromthem.Therefore,geothermalenergyismuchcheaperthantraditionalones,savingupto80%ofthecostsoverfossilfuels.Beingarenewableresource,geothermalenergyproduceslesswasteandpollutionthantraditionalenergysources.Ingeothermalsystems,carbondioxidemakesupabout10%ofairproduced.Overall,inordertoproducetheelectricitythatcanbeusedforonehour,thegeothermalsystemsproduce0.1poundofcarbondioxideandotherharmfulgases.Foracomparison,apowerplantproducingfromgasproducesupto2poundsofcarbondioxideintotheatmosphere,andthosepowerplantsthatworkoncoal（煤）produceanastonishing3.6poundsofgreenhousegases.Lowcostsisanotherreasonwhyusinggeothermalpowerplantsshouldbethefirstchoiceformanycountries.Geothermalheatsystemsrequire25%to50%lessenergyforworkcomparedwiththetraditionalsystemsforheatingorcooling.Besides,geothermalequipmentislessbig:duetotheverynatureofgeothermalenergy,geothermalpowerplantshaveonlyafewmovingparts,allofwhichcanbeeasilyshelteredinsidearelativelysmallbuilding.What’smore,thelifespanofgeothermalequipmentisratherlong.Allthesemakegeothermalpowerstationseasytobuildandkeep.1、Fossilfuelsaremoreexpensivethangeothermalenergypartlybecause_______.A．itisfreetousegeothermalenergyB．theproductionoffossilfuelscostsalotC．fossilfuelsarenearlyusedupD．geothermalenergydoesn’tdependonpoliticalsituation2、AccordingtoParagraph3,whatcanbeconcludedfromthecomparison?A．Geothermalenergyisenvironmentallyfriendly.B．Gasandcoalareoftenusedtoproduceelectricity.C．Coalismuchmoreefficientthangas.D．Thegeothermalsystemsdon’tproduceharmfulgases.3、Geothermalequipmentisusuallynotasbigasthatoftraditionalenergybecauseof______.A．thelifespanofgeothermalequipmentB．geothermalpowerplantsC．thenatureofgeothermalenergyD．thesmallbuildings4、Whatisthemainideaofthispassage?A．Manycountrieshavebenefitedfromgeothermalenergy.B．Geothermalenergyiswellaccepted.C．Fossilfuelsarebeingrunoutof.D．Geothermalenergyhasmanyadvantages.22．（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．Howtotakeaplane23．（8分）Themorningafteraneveningstruggletocareformythree-year-olddaughter,Icouldn’twaittogethertoschool.I,asamother,wastiredfromtheangerandherinabilitytocommunicatebecauseofherslowedlanguagedevelopment.AsIaccompaniedherintothecar,Ifeltdesperate.Nothingwasrightwithourworld.She’dbeenbornaroundthesametimewhenthenationwaswitnessingthebirthofanotherGreatRecession.Myjobandmyhousehadbeenvictims.Thenthishappened.Mychild’slanguagedelaywasidentified,butdoctorsstruggledtoproperlyhelpher,Ifeltlikewebothneededtoherescued.Ireturnedthatafternoonasdisenchantedwiththelittlegirl1lovedaswhen1left.Walkingslowlytowardtheschool’splaygroundgate,Ifoundherpreschoolteacherracingtogreetme.“Youshouldhaveseenhertoday!”Hisbreathywordsweresupportedbyexcitement.Ididn’tinterrupt.“Seethatclimber.”Hepointedtoawoodenpieceofplaygroundequipmentthatlookedlikearockwall.Inodded.“Well,everydaysinceshestartedschool,she’striedandfailedtomakeittothetop.”Hetookabreath.“Andtodayshedidit!”Heexpressedhisjoyjustashe’dwitnessedherconqueringMountEverest!“Shecheeredandcelebrated!IwishI’drecordedit!”Hiswordscomfortedme.Mydaughterhadconqueredhermountain.Assherantowardme,IrecognizedsomethingIhadn’tbefore.Isawherperseverance(毅力).Isawherstrength.IsawaHero.Everydaygreatnesscelebratesordinarypeoplewhodounusualthingsinbigandsmallways,showingcourage,kindness,loveandselflessness.Weencourageyoutoclickthesebriefaccountsandinviteyoutoshareyourownstory.1、Whydidtheauthorrushherdaughtertoschool?A．Shewasbusywithherworkasadoctor.B．Shehadafightwithherdaughterlastnight.C．Shebrokedownwhendealingwithherdaughter.D．ShehadtoselltheirhouseduetoGreatRecession.2、Whichofthefollowingbestexplains“disenchanted”underlinedinparagraph3?A．Happy. B．Concerned.C．Careful. D．Disappointed.3、Whydidthelittlegirl’spreschoolteacherfeelexcited?A．ShesucceededinstandingonMountEverest.B．Shemanagedtoclimbupthewoodenequipment.C．Shegotthefirstplaceintheschoolsportsmeet.D．Shebegantocommunicatewithothersnormally.4、Fromwhichisthetextmostprobablytaken?A．Theradio. B．Amagazine.C．Anewspaper. D．TheInternet.24．（8分）Thethingthatsetschildrenapartfromadultsisnottheirignorance，northeirlackofskills．Rather，it'stheirenormouscapabilityforjoy．Afriendtoldmeastory．Oneday，whenshewenttogethis6-year-oldsonfromsoccerpractice，herkidgreetedherwithasadface．Theteacherhadcriticizedhimfornotfocusingonhissoccerdrills．Thelittleboywalkedoutoftheschoo1withhisheadandshouldershangingdown．Heseemedwrappedinsadness．Butbeforereachingthecardoor，hesuddenlystopped，crouching(蹲伏)downtolookatsomethingonthesidewalk．“Mom，comehere!ThisisthestrangestbugI’veeverseen．Ithas，1ike，amillionlegs．It’samazing!”Thelittlefacewasoverflowingwithindescribableexcitement．Nowadays，however，whenwewalkintoaclassroom，especiallyinahighschool，we’llbechokedbytoweringbooksandpapers，andhidingbehindthemareagroupofmotionlesscreatures，pensinhand，mindsdry，justasthehollowmenportrayedbyT．S．Eliot．Theirpursuitofjoyhasgivenwaytotheirhungerforgrades．Laughterandhappinessareadistantmemoryforthem．Althoughjoyisanunaffordableluxuryintoday’sincreasinglyfiercecompetition，administratorsandteachersneedamindsetshiftfromcrushingstudentswithassignmentstogettingthemtotakepleasureinproductiveactivitieswhichdeveloptheirimportantqualities，likeperseveranceandobligation．Theassumptionthatpleasureistheenemyofcompetenceandresponsibilitymakesnosenseeducationally．Adultstendtotalkaboutlearningasifitweremedicine：unpleasant，butnecessaryandgoodforyou．Whynotthinkoflearningasifitwerefood—somethingsovaluabletohumansthattheywanttoexperienceitasapleasure?1、HowisParagraph1mainlydeveloped?A．Bydescribingaprocedure． B．Byanalyzingtheprocess．C．Bygivinganexample． D．Bycollectingdata．2、WhatdoestheauthorintendtodoinParagraph2?A．Summarizethepreviousparagraph． B．Providesomeadviceforthereaders．C．Introducethemaintopicfordiscussion． D．Clarifysomepuzzlingquestions．3、Whatdoesthetextsuggestadministratorsandteachersdo?A．Stopgivingstudentshomework．B．Involvestudentsinmeaningfulactivities．C．Supplystudentswithluxuries．D．Arousestudents’fondmemories．4、Whatisthetextmainlyabout?A．Joyisthespokespersonforlearning． B．Pleasureistheenemyofprogress．C．Educationistheparadiseforparents． D．Examsareanever-endingwar．25．（10分）Thousandsoffree,popularchildren'sappsavailableontheGooglePlayStorecouldbeviolatingtheChildren'sOnlinePrivacyProtectionAct(COPPA),accordingtoanew,large­scalestudy,highlightinggrowingcriticismofSiliconValley'sdata­collectionefforts.“Thisisamarketfailure，”saidSergeEgelman,aco­authorofthestudy.“Whatwehaveuncoveredpointsoutbasicenforcement(执行)workthatneedstobedone.”Thepotentialviolationswereabundantandcameinseveralforms,accordingtothestudy.Morethan1，000children'sappscollectedidentifyinginformationfromkidsusingtrackingsoftwarewhosetermsexplicitlyforbidtheiruseforchildren'sapps.TheresearchersalsosaidnearlyhalftheappsfailtoalwaysusestandardsecuritymeasurestotransmitsensitivedataovertheWeb,suggestingaviolationofreasonabledata­securitymeasureslaidoutbyCOPPA．SomeoftheappsinquestionincludedDisney's“Where'sMyWater？”，Gameloft's“MinionRush”andDuolingo,alanguagelearningapp.ThefindingsalsosuggestedthatappcreatorsthathadbeenofficiallyrecognizedasCOPPA­compliant(遵守)werenobetterthananyoftheotherappdevelopersatprotectingchildren'sprivacy.Disneyarguedthatthestudydoesn'tclaimtoidentifyanyactualviolations.“Protectingchildren'sonlineprivacyisveryimportanttousandweareconfidentthatourpracticescomplywiththelaw，”thecompanysaid.“WehaveasoundCOPPAcomplianceprogram,andwemaintainstrictdatacollectionandusepoliciesforDisneyappscreatedforchildrenandfamilies.”Gameloftannouncedthatchildren'sprivacyisof“utmostimportance”andisinvestigatingtheissue.“Wehaveaverystrictdata­collectionpolicyatGameloftandalwaysmakesurethatwearecompliantwithprotectionlaws，”thecompanysaid.Duolingodidnotrespondtorequestsforcomment.AlthoughGooglestatedthat“Wearetakingtheresearcher'sreportveryseriouslyandlookingintotheirfindings”，criticsofGoogle'sappplatformsaythecompanyhasprofitedgreatlyfromadvancesindata­trackingtechnology.“Googlehasbasicallylookedtheotherwaywhileitwasabletogeneraterevenuesoffofchildren'sapps，”saidJeffreyChester,theexecutivedirectoroftheCenterforDigitalDemocracy.“Thenew,alarmingreportisfurtherevidencethatGoogleisthumbing_its_nose_attheonlyfederalonlineprivacylawthatwehave.”1、HowdidcompaniesrespondtotheaccusationofviolatingCOPPA?A．Disneyclaimedtostrictlyobeyprivacylaws.B．Gameloftquestionedthevalidityofthestudy.C．Duolingoplannedtoadoptstrictdata­collectionpolicies.D．Googleadmittedtothechargeandpromisedtodomore.2、Whatdoestheunderlinedphrase“thumbingitsnoseat”probablymean?A．Observing.B．Disrespecting.C．Prohibiting.D．Introducing.3、Thepurposeofthepassageisto________．A．chargeappcompanieswiththeviolationofCOPPAB．informreadersofdifferentwaystoviolatechildprivacylawsC．illustratethegrowingcriticismofapp'sdata­collectionfunctionD．highlighttheurgencyofstrengtheningenforcementofCOPPA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）阅读下面短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。IwassixwhenIjoinedmyfather'sfieldsinOkla.BythetimeIwaseight,IwashelpingDad1oldfurniture.HegavemeacentforeverynailI2outofoldboards.Igotmyfirstrealjob,atJM'sRestaurantwhenIwas12.Mymainresponsibilitieswere3tables.Atthatage,itwas4goingtoworkandglimpsedatmyfriendsrunofftoswimorplay.Ididn'tnecessarilylikework,butIlovedwhatworking5metohave.Becauseofmyjob,Iwasalwaysthefirstonetobuysomethingdelicious.Thismademe6.WordthatIwastrustworthyandhard-working7aroundtown.Alocalclothingstoreofferedmecreditdespitemyyoungage.Iimmediatelyboughtanexpensivecoatandshoesoncredit.Iwas8only65centsanhour,andIalreadyowedthestorekeeper$90!SoIlearned9thedangerofeasycredit.IpaiditoffassoonasIcould.Myfirstjobtaughtme10andbroughtmealevelofpersonalsatisfactionfewofmyfriendshad11Asmyfather,whoworkedthreejobs,oncetoldme,“Ifyouunderstandsacrificeand12,therearenotmanythingsinlifeyoucan'thave.”Howrighthewas.1、A．makeB．paintC．sellD．repair2、A．pulledB．putC．pickedD．pressed3、A．sweepingB．packingC．clearingD．emptying4、A．easyB．heavyC．difficultD．pleasant5、A．allowedB．preferredC．taughtD．managed6、A．proudB．richC．gratefulD．hopeful7、A．showedB．gotC．flewD．carried8、A．raisingB．spendingC．countingD．making9、A．greatlyB．actuallyC．hardlyD．really10、A．self-developmentB．self-controlC．self-criticismD．self-confidence11、A．lostB．improvedC．developedD．experienced12、A．responsibilityB．promiseC．independenceD．ambition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）Anewresearchshowsthatnicerpeoplearelikelytobepoorerthanpeoplewhoarenotsonice.Researchersstudiedhowthepersonalitiesofdifferentpeople1．(affect)howrichtheywere.Theyfoundthatpeople2．aniceandwarmpersonalitywere3．(poor)thanpeoplewhoweremoreselfish.Theyalsofoundthatitwasmoredifficultforkinderpeopletolookaftertheirmoneybecauseoftheir“agreeableness”.Theresearchsuggeststhatagreeableness4．(associate)withvarioussignsoffinancialhardship,includinglowersavingsandhigherdebt.Researcherslookedatdatafromdifferent5．(source),includingtwoonlinesurveystakenbyalmost4,000participants.Thedataincludedanswerstoquestionsonpeople'sfinancialsituation6．people’sattitudetowardsmoney.Theycomparedthisdatawithfindingsofsomeothersurveys,in7．almost5,000peopleansweredquestionsabouttheirpersonalityandtheiragreeableness.Theresearcherssayagreeablepeopleseem8．(care)lessaboutmoneysotheydonotmanagetheirmoney9．(wise).ResearcherSandraMatzsaysthat10．(be)kindhas"financialcosts"butthatkinderpeople“alwayshaveahappierlife”.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处错误，每句中最多有两处。每处错误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。Lastweek,ourclassheldaclassmeetingtocelebrateWorldAnimalDay.Atfirst,wemadepreparationstotheactivity.Severalstudentsdesignablackboardposterbutsomedecoratedtheclassroom.Themeetingbeganwithfewinterestinggames.Then,asadsongaboutanimalssangbytwogirlstouchedusdeep.Fourotherstudentsperformedaplay,showingushowterriblethesituationofendangeredanimalswere.Finally,ourmonitorgaveusaspeech,thatmadeusawareoftheimportanceofprotectinganimal.Theactivityismeaningfulbecauseofwenowrealizethathumanbeingsshouldliveinharmonywithanimals.第二节书面表达（满分25分）29．（25分）假设你是李华，最近你刚交的笔友Jonah要来北京旅游，但他来信想让你提前给他简单介绍一下北京。请你根据所给提示给他回信。1.中国的首都，是政治、经济、文化中心；2.主要景点有长城（世界上最长的人工建筑）、故宫（世界最大、最完整的木质古建筑）、颐和园（园林杰作）等，它们均被列入了世界遗产名录。注意：1.词数100左右（开头和结尾已给出，但不计入总词数）；2.可适当增加细节，以使行文连贯；3.参考词汇：杰作masterpiece；世界遗产名录theWorldHeritageList。DearJonah，I’mgladyouarecomingtoBeijingandI’mhonoredtointroduceittoyou.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________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、A5、A6、B7、A8、D9、A10、B11、D12、A13、B14、A15、D16、A17、D18、A19、A20、D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、B2、A3、C4、D22、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-dollartoolkitthatastronautHeidemarieSt