上海市黄浦区市级名校2025届英语高三第一学期期末达标检测模拟试题含解析

上海市黄浦区市级名校2025届英语高三第一学期期末达标检测模拟试题注意事项:1．答题前，考生先将自己的姓名、准考证号码填写清楚，将条形码准确粘贴在条形码区域内。2．答题时请按要求用笔。3．请按照题号顺序在答题卡各题目的答题区域内作答，超出答题区域书写的答案无效；在草稿纸、试卷上答题无效。4．作图可先使用铅笔画出，确定后必须用黑色字迹的签字笔描黑。5．保持卡面清洁，不要折暴、不要弄破、弄皱，不准使用涂改液、修正带、刮纸刀。第一部分（共20小题，每小题1.5分，满分30分）1．Mariaisconstantlymakingefforts,shedeservesthegoalofenteringthekeyuniversity.A．achieving B．toachieve C．beingachieved D．tobeachieve2．She________tosomeoneonthephone,soIjustnoddedtoherandwentaway.A．talked B．hastalkedC．hadtalked D．wastalking3．Thehigh-anxietyfocusonreadingscoremayhavenarrowedstudent________toknowledgeabouttheworldthatcanimprovetheirreading.A．idea B．aid C．belief D．access4．Betweenthetwogenerations,itisoftennottheirage,_________theireducationthatcausesmisunderstanding.A．likeB．asC．orD．but5．AfternineyearsworkingtoprotectSiberiantigers,YangJun_____hiseffortsrecognizedattheannualawardceremonyinBeijingwherehewasnameda"wildlifeprotector".A．had B．hadhadC．hashad D．has6．Therearealsopeoplewhoobjecttofairystoriesonthegrounds______theyarenotobjectivelytrue,andthatgiants,witches,two-headeddragonsetcdonotexist.A．that B．what C．which D．when7．---I’llsendyouthesignedcontractpersonallythistimetomorrow.---Sorry,I______ameetingthen.A．amattending B．attendedC．haveattended D．willbeattending8．Iliveinatown______runsasmallandwindingriver.A．throughwhichB．whichC．inwhichD．where9．Itisimmediatelyclear______thefinancialcrisiswillsoonbeover.A．since B．whatC．when D．whether10．—Sorry,Mum!Ifailedthejobinterviewagain.—Oh,it'stoobad.You________havemadefullpreparations.A．must B．can C．would D．should11．Ifshe________generousasshemakesoutshewouldhavedonatedmoremoneyinthecatastrophe.A．hadbeen B．wereC．wouldbe D．was12．—Mum,littleRaybrokehistoysagain!—Itdoesn'tmatter.Yousee,accidents_____happen.A．shall B．should C．must D．will13．Mr.Smartisbelievedtobeacapableperson,whoisequal_____chargeofthecompanyverywell.A．totake B．totaking C．tobetaken D．taking14．Fathermadeapromise______________Ididwellintheentranceexam,hewouldtakemetoHongKonginthesummervacation.A．ifthat B．ifC．thatif D．that15．IfJoe’swifewon’tgototheparty,________.A．hewilleither B．neitherwillheC．heneitherwill D．eitherhewill16．____thismaysoundlikeasimpleprocess,greatcareisneeded．A．Since B．Once C．Although D．Unless17．ThoughProfessorLiu____inNewYorkforsevenyears,hehasneverregrettedmovingbacktoShanghai,hishometown.A．lived B．haslived C．hadlived D．wasliving18．---Howdidyouliketheconcertlastnight?---Ienjoyeditverymuch,butthedancers______abetterjob.A．couldhavedone B．couldn’thavedone C．coulddo D．haddone19．Asisknown,itwasHuJintao,_______presidentofournation,whogave________lectureattheceremonyofNationalDayA．the;a B．the;/ C．a;the D．/;a20．TheSmallGoosePagodainXi’an,oneofthe22SilkRoadrelicslocatedinChina,_______backin707duringtheTangDynasty.A．dated B．wasdatedC．dates D．isdating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）NowadayssixAmazonScoutdeliveryrobotsrolledoutinapilotprograminSnohomishCounty,Wash.Therobotscarrymeals,groceriesandpackagestohomesandofficesinthisregionjustnorthofSeattle.TheyhaveappearedonthesidewalksofLondon,Beijingandothercitiesandcommunitiesworldwide.Thesemachinesmustovercomepedestrianlegs,naughtydogsandbrokenpavement,whichraisessomequestions.Theseservicesaregainingattractionasagrowingnumberofcityresidentsexpectimmediateorscheduleddeliveryforjustabouteverything.Between2017and2018onlineretailsalesintheU.S.increasedby16percent.Onthefinalstepofallthesedeliveries,calledthelastmile,humansonbicycles,motorizedscooters(电动车)orlargedeliverytruckstypicallydeliverpackages.Allthevehiclescompeteforspaceonbusyurbanstreets.“Deliveriesaretrendingupwardsinallcrowdedcitycenters,andifcityandstateleadersdon’tstartthinkingaboutcreativesolutionslikerobotdeliveries,wecanexpectevenworsetrafficjams,”saysPaulMackie,directorofatransportationpolicyresearchcenterinArlington.Astudybythiscenterfound73percentofdeliveryvehiclesinArlingtonwereparkedoutsideofauthorizedareas,oftenblockingbikelanesandcrosswalks.Bymovingthelaststepofdeliveriesfromtheroadtothesidewalk,citiescouldreducetrafficjamsandsolvetheparkingproblementirely,Mackiesays.CompaniessuchasAmazonarenotdevelopingthisdeliverytechnologysimplytoclearupurbantraffic.Self-drivingvehiclesandsidewalkrobotscouldcutdownlast-miledeliverycostsincitiesbyasmuchas40percent,accordingtoa2018reportbyaconsultancyfirm.Adeliveryrobotcancostthousandsofdollarstomanufacture,andmostcurrentlyrequirehumanmanagementandconservation.Butinthelongruncompaniesthatuseautonomousdeliveryvehiclesinthenextseveralyearscouldendupsavingbillionsofdollars,thereportstated.1、WhydoesAmazonintroducedeliveryrobots?A．Toamuseitscustomers.B．Toavoidpedestrians,dogsandbrokenpavement.C．Tomeettheincreasingdemandofdeliveringpackages.D．Toconfirmthecompany’sinnovationspirit.2、WhatdoesPaulMackiemeanbyhiswordsinparagraph2?A．RetailsalesintheU.S.increasedfast.B．Deliveriesstaysteadyinallcrowdedcitycenters.C．Regardlessofrobotdeliveries,trafficjamswillremainthesame.D．Robotcanhelpeasethetrafficpressure.3、Whatcanrobotsdeliverybringtothecity?A．Blockbikelanesandcrosswalks.B．Relieveurbantrafficaswellassavedeliverycosts.C．Increasedangertopedestrians.D．Leadtotraffictrafficjams.4、Whichwordcanbestdescribethefutureoftherobotdelivery?A．Uncertain. B．Hopeless. C．Promising. D．Unacceptable.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）EachapplicanttoHarvardCollegeisconsideredwithgreatcare.WeconsidereachapplicanttoHarvardCollegeasawholeperson,andputenormouscareintoevaluatingeveryapplication.Wehopeyouwillexploretheinformationinthissectiontounderstandwhatwelookforinouradmissionsprocess.HowtoApplySubmityourapplicationthroughtheCommonApplication,theCoalitionApplication,ortheUniversalCollegeApplication.EachistreatedequallybytheAdmissionsCommittee.Completeandsubmityourmaterialsassoonaspossibletoensurefullandtimelyconsiderationofyourapplication.ViewourApplicationTipsforstep-by-stepinformation.WhentoApplyDateDeadlineDateDeadlineNovember1EarlyActionDeadlineMarch1FinancialAidApplicationdeadlineNovember1EarlyFinancialAidApplicationdeadlineLateMarchDecisionlettersmailedMid-DecemberEarlyAuctiondecisionsreleasedMay1ReplydateforAdmittedStudentsJanuary1RegularDecisiondeadlineWhatWeLookForWeseekpromisingstudentswhowillcontributetotheHarvardcommunityduringtheircollegeyears,andtosocietythroughouttheirlives.Whileacademicaccomplishmentisthebasicrequirement,theAdmissionCommitteeconsidersmanyotherfactors—strongpersonalqualities,specialtalentsorexcellencesofallkinds,perspectivesformedbyunusualpersonalcircumstances,andtheabilitytotakeadvantageofavailableresourcesandopportunities.WeoutlineeverythingyouneedtoapplytoHarvard.Clickhttps://college.harvard.edu/admissions/applytogetdetailedrequirements.1、Wherecanyoufindstep-by-stepinformationofhowtoapply?A．CommonApplication. B．CoalitionApplication.C．UniversalCollegeApplication. D．ApplicationTips.2、WhichisthefinaldayforFinancialAidApplication?A．November1. B．January1.C．March1. D．May1.3、WhatisthebasicrequirementtoapplyforHarvardUniversity?A．Academicaccomplishment. B．Strongpersonalqualities.C．Specialtalents. D．Uniqueperspectives.24．（8分）Let'sGoFlyaKite...—atPiedmontMiddleSchool'scelebrationofkites!Comeandlearnhowtobuildallsortsofkites,fromthesimplestdiamond-shapedkitestothemostcomplexboxkites.Stayaslongasyoulikeandbuildasmanykitesasyouwant.Onceyouhavefinishedakite,getadviceonflyingtechniquesfromkiteexpertLorenaHallsberg.ThecelebrationwillbeatPiedmontMiddleSchool,151PiedmontSchoolDrive.ThePiedmontMiddleSchoolParentTeacherOrganization(PTO)hasorganizedarefreshment(茶点)tent.AllprofitswillbenefitfuturePTOactivities.Takeabreakfromkiteflyinganddrinksomelemonade!Whileyouaredoingso,whynotjointhePTO?Membershipisfree;youjustdonateyourtime.ShowyoursupportforPiedmontMiddleSchoolbyjoiningthePTOthisSaturday!When:Saturday,April11,from9:00amto5:00pmWhere:PiedmontMiddleSchoolWhy:Forfun!Cost:Free,thankstoagenerousgiftfromBizarcoKiteCompany!Schedule9:00am:Kite-buildingboothsopen.Allmaterialsaresuppliedforkites.10:00am:Kite-buildingshowsbyLorenaHallsberginthecourtyard.Comebyandlearnhowtobuildboxkitesandkitesthatlookandflylikebutterflies.11:00am:Kite-flyingshowsontheschooltrack.Learnallthemostimportantskills.12:00pm:Kite-flyingcompetitionsontheschooltrack.1:00pm:PresentationbyDr.BrianLehrmanintheshowtent:"TheHistoryofKites".2:00pm:BestKitecompetitionsandjudgingintheshowtent.Comeseethemostartistickitesandthemostinterestingthemekites.3:00pm:PresentationbyDr.Lehrmanintheshowtent:"KitesandScience".3:30pm:AwardsceremonyconductedbyHeadmasterSewardonthefootballfield.Theresultsoftheday'sjudgingwillbeannounced,withawardssuchasBestofShow,MostArtistic,HighestFlyer,andothers.WinnerswillreceivegiftsfromtheBizarcoKiteCompany!4:00-5:00pm:Let'sallgoflyakite!Everyoneflieskitesatthesametime,creatingawonderfulsightforalltoenjoy.Cometothekitecelebration,enjoyyourselfandlearnmore.1、ThemainpurposeofParagraph2istoaskpeopleto____.A．buildakite B．supportthePTOC．takeabreak D．jointhefun2、Whichtimesaremostimportantforpeoplewhowanttojoininkitecompetitions?A．10:00amand11:00am. B．12:00pmand2:00pm.C．1:00pmand3:00pm. D．2:00pmand4:00pm.3、Fromthepassage,weknowthatthekitecelebration___.A．isenjoyableandeducationalB．isstrictabouttheshapesofkitesC．getsmoneyfromPTOofPiedmontMiddleSchoolD．givespeopleachancetoseekitesfromaroundtheworld4、Thepassageisintendedfor____.A．schoolstaff B．kiteexpertsC．studentsandparents D．kitecompanies25．（10分）Clyde,asmall-clawedotter,wasmovedfromAucklandZootoWellingtonZootwomonthsago.ThezookeepershopedheandtheotherotterBonniemightstartafamilytogether.Butonlytwodaysafterhearrived,Clydewentmissing.Hehaddughiswayunderoneofthewallsandwasnowheretobeseen.Thezookeeperssetupcagesinsidethezoo,withplatesofClyde’sfavoritefishinthem,hopingtocatchhim.TwodayswentbyandstilltherewasnosignofClyde.AtlastacouplesawClydeattheirhouseawholekilometerawayinNewtown.Clydewashidinginanout-of-reachholeoutsidetheirlaundry.Thezookeepersarrivedandsetupsomemoretrapstotrytocatchhim.ButClydeisaprettysmartotter.Twicehemanagedtogetthefishoutofatrapwithoutbeingcaught.Fivedaysafterhe’descaped^Clydesdaysontheruncametoanendwhenhewasfinallycaughtinoneofthetraps.ItwasnogoodputtingClydebackinhisoldhome---he’donlydighiswayoutagain.SoheandBonniewereputintothezoohospital.Therewasnochanceoftheirescapingfromthere.Meanwhile,thezookeeperswereworkinghardtomakeClyde’soldhomesafer.Theyputanironbarrierundergroundtostophimdigginghiswayout.ThenBonnieandClydewenthomeagain.Butamonthafterhisfirstescape,Clydewasoutagain.OncemorethezookeeperscamehurryingtocatchClyde.Theyfoundhimbyfollowingthebubbleshemadeintherivernearby.NobodyknewhowClydehadescaped.Butthistimehewasonlyoutforanhour.Sobackhewenttothehospitalagain.PoorClyde.Itseemedthathewasn’thappyatWellingtonZoo,eventhoughheandBonnieweregettingonwelltogether.Thekeepersdidn’tlikeseeinghimunhappy,sotheyplannedtolookforahomeforhimsomewhereelse.1、WherewasClydefoundafterhisfirstescape?A．BackinAucklandZoo. B．Inarivernearby.C．Atahouseakilometeraway. D．Inthezoohospital.2、HowdidzookeeperscatchClydeafterhissecondescape?A．Theysetupcagesinthezoo. B．TheyattractedClydewithfish.C．Theydugaholeoutsidehishome. D．Theyfollowedthebubblesinthewater.3、WhatdoweknowaboutClyde?A．Heoftengetsill. B．Heisgoodatdigging.C．Helikeshidinginahole. D．HeescapedtomeetBonnie.4、Whereisthepassagemostlikelytohavebeentakenfrom?A．Anewsreport. B．Anadvertisement.C．Abookreview. D．Aresearchpaper.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）完型填空（共20小题；每小题1.5分，满分30分）阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。Triedandexhausted,Icamebackhomefromwork.Ifoundthefrontdoorwas1openandIfeltalittlescared.DidIcarelesslyforgettolockitafterIleft?Ilookedaround2toseewhatcouldbe3Whywouldsomeonecomeintomyhomeonlyto4withnothing?Aftersearchingeveryinch,Irealizedthateverythingwas5Ihadleftit.No6cushions,brokenlamps,or7emptiedoutonthecarpet.Feelingmuch8IlookedoutmyoversizedwindowofmydinningroomatMs.Sullivan’shouse.Jimmy,thelittleboynextdoorwasvisitingher.JimmycaredalotaboutMs.Sullivanandwasveryconcernedwithherhealthaftershebecameill.Sheusedto9Jimmywhenhewasjustababy.Forgettingaboutthe10withmyfrontdoor,IdecidedtowalkovertoMs.Sullivan’shousetoseehowshewas11Withawarmhello,sheinvitedmeintoherhome.Inoticedtwelvebeautifulrosesdelicatelypresentedonthetablenexttoherbed.Theylookedexactlylikethe12onmydinningroomtableinfrontofmyoversizedwindow.Withapleasantsmile,shetoldmeJimmybroughtthemtoherasa“get-wellgift”.SuddenlyJimmy13outofhisseatinaninstantandsaidthathehadtogohomeforawhiletodosomehomeworkbuthepromisedtobebackto14uponMs.Sullivan.Talkingforawhile,Ms.SullivanbegantogetverytiredsoIgavehermyphonenumberincaseshe15neededhelp,andleftherhome.Ithoughtabouthow16itwasforlittleJimmytobesoconcernedforMs.Sullivan.Igothome,laughingathow17Iwasthatmorningaboutwhathadhappenedover18Iwalkedpassedthedinningroomandnoticedmyroses19inthevaseweremissing.Withoutasecond20,IglancedoutthewindowatMs.Sullivan’shouseandwithasmileonmyfaceIturnedoffthelightintheroomandwenttosleep.Thenextmorningmydoorbellrang.IopenedthedoorJimmywasthere…1、A．easily B．slowly C．slightly D．silently2、A．tensely B．patiently C．eagerly D．calmly3、A．burning B．losing C．lacking D．missing4、A．get B．deal C．steal D．leave5、A．what B．where C．that D．how6、A．worn B．changed C．unwashed D．overturned7、A．lockers B．kettles C．drawers D．coats8、A．eased B．angry C．surprised D．curious9、A．watch B．guard C．follow D．visit10、A．accident B．experience C．incident D．condition11、A．working B．doing C．sleeping D．acting12、A．lamps B．vases C．roses D．gifts13、A．stood B．ran C．stepped D．jumped14、A．look B．check C．pick D．call15、A．ever B．still C．only D．just16、A．smart B．sensitive C．sweet D．thankful17、A．strange B．nervous C．careless D．wrong18、A．everything B．something C．anything D．nothing19、A．growing B．sitting C．lying D．arranging20、A．thought B．intention C．expectation D．delay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）Abusdriverhasbecomefamoussinceapictureofhimhelpinganelderlyladytocrossaroad1．(publish)online.MarkAdamswasseenparkinghisbusintheJericoareaofOxfordtohelpa90-year-oldlady2．(call)Maureen.Hisactofkindnesswasphotographedbyabuilder3．(use)hissmartphoneandsenttothebuscompany.4．driver,fromWallingford,saidhisactofkindnesswassomethinghedidforpeopleeveryday.The54-year-old,5．hasbeenabusdriverfor30years,saidbusservicesprovidedalifelinefoetheelderlyandhewould“runallservicesforfreeifIwereamillionaire”.Hesaid,“I6．(see)herbeforeandknewshewasonherwaytodosomeshopping,soIpulledoverandhelpedhertocross.”KeithO’ConnercaughtthemomentonTuesday7．senthisphotographtotheThamesTravelbuscompany,whereMr.Adamsworks.Themodestdriversaidtherewere“thousandsofbusdrivers8．me.”“Therearesomanyold9．(lady)inthisareawhorelyonthebusfortheirindependence,”hesaid,“Itdoesn’ttakemuchtobe10．(help).”第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）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。Mr、Johnsonisahardworkingteacher、Everyday,hespendstoomuchtimewithhiswork、Withlittlesleepandhardlyanybreak,soheworksfrommorningtillnight、Hardworkhavemadehimveryill、“Hehasruinedhishealthy、Weareworriedabouthim、”Thatiswhichotherteacherssay、Yesterdayafternoon、IpaidvisittoMr、Johnson、Iwaseagertoseehim,butoutsideherroomIstopped、Ihadtocalmmyselfdown、QuietlyIstepintotheroom、Isawhimlyinginbed,lookingatsomeofthepicturewehadtakentogether、Iunderstoodthathemissedusjustasmanyaswemissedhim、第二节书面表达（满分25分）29．（25分）假定你是高三(3)班学生李华，就学校食堂的卫生情况想给校长Mr.Smith写一封信，反映以下问题：1.食物不加盖；2.品种单一；3.服务态度差。注意:1.词数80左右;2.可以适当增加细节，以使行文连贯;3.开头和结尾已为你写好，不计入总词数。DearMr.Smith，I‟mLiHua,astudentfromClass3Grade12._____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Thankyoufortakingthetimetoconsidermyrequests.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、D3、D4、C5、A6、A7、D8、A9、D10、D11、B12、D13、B14、C15、B16、C17、A18、A19、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、D3、B4、C22、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-dollartoolkitt