重庆市大足区2025届英语高三上期末复习检测模拟试题含解析

重庆市大足区2025届英语高三上期末复习检测模拟试题注意事项1．考试结束后，请将本试卷和答题卡一并交回．2．答题前，请务必将自己的姓名、准考证号用0．5毫米黑色墨水的签字笔填写在试卷及答题卡的规定位置．3．请认真核对监考员在答题卡上所粘贴的条形码上的姓名、准考证号与本人是否相符．4．作答选择题，必须用2B铅笔将答题卡上对应选项的方框涂满、涂黑；如需改动，请用橡皮擦干净后，再选涂其他答案．作答非选择题，必须用05毫米黑色墨水的签字笔在答题卡上的指定位置作答，在其他位置作答一律无效．5．如需作图，须用2B铅笔绘、写清楚，线条、符号等须加黑、加粗．第一部分（共20小题，每小题1.5分，满分30分）1．--Tom,yourforeignteacherspeaksChinesefluently!--Oh,shehaslivedinChinaforsixyears;otherwiseshesuchgoodChinese.A．didn’tspeak B．wouldnothavespokenC．wouldnotspeak D．hadn’tspoken2．The88thAcademyAwardCeremonywasheldinDolbyTheatre______seatsanaudienceofapproximately3,400.A．where B．whose C．when D．which3．Itisreportedthehousingpricesinsomebigcitiesfallindifferentdegrees.A．whichB．whatC．thatD．where4．Ifithadnotbeenfortheheroes’contributionsandsacrifices,we_____suchahappylife.A．wouldn’thaveled B．wouldn’tbeleadingC．haven’tled D．arenotleading5．Inviewofrapidlyagingpopulation,thesecond-childpolicyatthestartof2016.A．isadoptedB．wasadoptedC．hasbeenadoptedD．wasbeingadopted6．Hissisterlefthomein1998,and_________________since.A．hadnotbeenheardof B．hasnotbeenheardofC．hadnotheardof D．hasnotheardof7．Tomissocreativeapersonthathealwayshaslotsof_________ideasinhismind,andsometimeswedon’tevenknowwhatheisthinkingabout.A．meanB．novelC．slimD．instant8．Accordingtoarecentstudy,thehighschoolgraduationrateforblackmenhasfallenby43percent,while________ofblackwomenhasrisenby56percent.A．that B．whatC．one D．which9．Accordingtothebankrulesreleasedrecently,youhavetopaya25%________oneachchequeyoucash.A．admission B．pensionC．allowance D．commission10．_______withallsortsofaffairs,themanagerhadlittletimetohaveagoodsleep.A．Occupying B．BeingoccupiedC．Occupied D．Havingoccupied11．---WhatdoesPM2.5mean？---It'saprofessional_____________indicatingtheconditionofairpollution.A．number B．markC．term D．item12．Becalm,Madam.Canyouremember_____________youhadyourmobilephonestolen?A．whenwasitthat B．thatitwaswhenC．whereitwasthat D．itwaswherethat13．Icertainlyexpecttobeelectedbeststudentoftheyear.It’sreally________!A．agoodSamaritanB．awetblanketC．afeatherinmycapD．apieceofcake14．Parentsoftentelltheirchildrenthatthey__________takecandyfromstrangers.A．needn't B．wouldn't C．shouldn't D．daren't15．TheDragonBoatFestival________thebeginningofthehottestseasonoftheyear.A．ismarkingB．marksC．willmarkD．marked16．Ifanentirecountrygetsricheratthesametime,individualswouldn't________feelwealthier,sincetheirrelativepositionsinsocietyhaven'tchanged.A．necessarily B．initially C．typically D．sustainably17．____________youarefamiliarwiththeauthor’sideas,tryreadingallthesectionsasquicklyasyoupossiblecan.A．NowthatB．EversinceC．SothatD．Incase18．Heisabad-temperedfellow,buthe________bequitecharmingwhenhewishes.A．shall B．shouldC．can D．must19．Soabsorbed________inheryogaexercisesthatshetooknonoticeoftheheavyrainoutside.A．Marywas B．MaryhasbeenC．wasMary D．hasMarybeen20．Inthe"moongarden"onboardtheChang'e4,theshootsofcottonmarkedthefirstlivematterever_____onthemoon.A．havinggrownB．tobegrownC．beinggrownD．grown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）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．Howtotakeaplane22．（8分）Throughoutourdailylives,wehaveknownplentyofpeopleandwillknowmore.Buthowcanwetellifsomeoneistrustworthy?InapaperpublishedrecentlyintheJournalofPersonalityandSocialPsychology,researchergaveustheanswer.Theresearchersasked401adultsfromtheUnitedStatestofilloutaquestionnairemeasuringtheirguilt-proneness(内疚倾向)indifferentsituationsaswellasseveralotherqualities,andthenplayashortonlinegame.Inthisgame,Player1isgiven$1,whichtheycanchoosetogivetoPlayer2.AnymoneygiventoPlayer2isthenautomaticallyincreasedto$2.50.Player2canthendecidewhethertokeepallofthemoneyorbehaveinatrustworthywaybyreturningaportionofthemoneytoPlayer1.Theresearchersfoundmoreguilt-pronepeopleweremorelikelytosharethemoneywithPlayer1.Actually,infollow-upstudies,guilt-pronenesspredictedtrustworthinessbetterthanotherpersonalityqualitiestheresearchersmeasured.Whymightguiltleadtotrustworthybehavior?Theresearchersfoundpeoplewhowereguilt-pronealsoreportedfeelinganobligationtoactinethical(合乎道德的)andresponsiblewayswhileinteracting(互动)withtheirpartnersinthegame.Peoplewhoareguilt-pronetendtoavoidengaginginbehaviorthatmightharmordisappointothers.Iftheydosomethingbad,guiltencouragesthemtotrytomakethingsrightagain.Then，howcanweusethisresearchtoascertainwhethersomeoneistrustworthy?“Onewaytodothismightbeobservehowtheyrespondtoexperienceregret,”leadauthorEmmaLevine,assistantprofessorattheUniversityofChicagoLevine,explains.Anotherwayistoaskthemtodescribeadifficultdilemmatheyfacedinthepast,suggestsco-authorTayaCohen,associateprofessoratCarnegieMellonUniversity.Thisisparticularlyeffective,Cohenandhercolleagueshavefound,becauseitallowsustoseeifthey’reconcernedabouttheeffectstheiractionshaveonothers.1、Whatmaymakeothersfeelthatwearereliableaccordingtothetext?A．Ourgoodqualitiestohelpthemout.B．Ourtendencytoexperienceguilt.C．Ourkindattitudetowardsthem.D．Ourteamspiritinthegame.2、Whatmayconnectguiltwithtrustworthybehavior?A．Asenseofresponsibility.B．Afeelingofdisappointment.C．Thewayoneinteractswithothers.D．Theabilitytotellrightfromwrong.3、Whatdoestheunderlinedword“ascertain”inthelastparagraphmean?A．Ask B．ExpressC．Describe D．Determine4、Howisthetextorganizedanddeveloped?A．Byprovidingbackground.B．Bymakingalotofcomparisons.C．Byansweringtheraisedquestions.D．Byanalyzingeffectsofguilt-proneness.23．（8分）ClaraDalywasseatedonanAlaskaAirlinesflightfromBostontoLosAngeleswhenaflightattendantaskedanurgentquestionovertheloudspeaker:“DoesanyoneonboardknowAmericanSignlanguage?”Sheknewsheneededtohelp.Clara，15atthetime，pressedthecallbutton.Theflightattendantcamebyandexplainedthesituation.“Wehaveapassengerontheplanewho’sblindanddeaf，”shesaid.Thepassengerseemedtowantsomething，buthewastravelingaloneandtheflightattendantscouldn’tunderstandwhatheneeded，accordingtoPEOPLEmagazine.ClarahadbeenstudyingASLforthepastyeartohelpwithherdyslexiaandknewshe’dbeabletofingerspellintotheman’spalm.Sosheunbuckledherseatbelt，walkedtowardthefrontoftheplane，andkneltbytheaisleseatofTimCook，then64.Gentlytakinghishand，shesigned，“Howareyou?AreyouOK/”Cookaskedforsomewater.Whenitarrived，Clarareturnedtoherseat.Shecamebyagainabitlaterbecausehewantedtoknowthetime.Onherthirdvisit，shestoppedandstayedforawhile.“Hedidn’tneedanything.Hewaslonelyandwantedtotalk,”Clarasaid.Soforthenexthour，that’swhattheydid.Shetalkedaboutherfamilyandherplansforthefuture(shewantstobeapolitician).CooktoldClarahowhehadgraduallybecomeblindovertimeandsharedstoriesofhisdaysasatravelingsalesman.Eventhoughhecouldn’tseeher，she“lookedattentivelyathisfacewithsuchkindness，”apassengerreported.“Clarawasamazing.”aflightattendanttoldAlaskaAirlinesinabloginterview.“YoucouldtellTimwasveryexcitedtohavesomeonehecouldspeakto，andshewassuchanangel.“Cook’sreaction:“BesttripI’veeverhad.”Lookingforwaystogivebackyourself?Startwiththisrandomactofkindnessthatcanchangesomeone’sliferightnow.1、Theflightattendantaskedanurgentquestionbecause______________.A．thepassengerwastravelingaloneB．theplanewasinadangeroussituationC．thepassengeraskedforsomethingurgentlyD．Theycouldn’tcommunicatewiththepassenger2、WhydidClaratalkaboutherplansforthefuture?A．Becausetheflightattendantaskedhertodoso.B．BecausesheneededtopicstogoontalkingwithCook.C．BecauseCookexpectedtounderstandteenagersbetter.D．Becauseshewantedtoshowherambitionforthefuture.3、WhichofthefollowingwordscanbestdescribeClara?A．Kindandcaring. B．Warm-heartedandcautious.C．Generousandamazing. D．Ambitiousandattentive.4、Thepassageismainlywrittento______________.A．tellatouchingstoryofanamazinggirlB．appealtoreaderstolendahandkindlyandrandomlyC．stressthegreatimportanceofAmericanSignLanguageD．showhowconsideratetheflightattendantwastohelpCook24．（8分）OnSept.19theWestchaseElementaryPTA（Parent-TeacherAssociation）willholditsWizardWalk.TheWizardWalkisalocallyorganized,healthyalternativetotraditionalproductsalesthatwillraisemoneytosupportallPTAprogramsandeventsfortheyear.Remainingmoneywillbeappliedtoanon-goingcapitalcampaigntobuildanewplayground.TheWizardWalkwilltakeplaceonWednesday,Sept.28,from8a.m.tonoonattheWestchaseRecreationCenterField.Volunteerswillbeneededthroughouttheevent.LookformoreWizardWalkinformationandvolunteersign-uplinksinyourstudent’sfolder,orcontact（联系）LauraKohleratpresident＠westchasepta.org.ThePTAisalsoholdingayear-longSpiritStickfundraiser（资金筹集活动）.SpiritSticksaresmallandstudentscandisplaythemonakeyringontheirbackpacks,whichrepresentavarietyofinterestsandaccomplishments.TherewillbemanywaystoearnaSpiritStick（goodgrades,greatbehavior,exceptionalattendance,etc.）andopportunitiestopurchasethelimitededitionsticksforjust$1everyFridayinthecourtyard.Formoreinformation,contactNikkiPivnichnyatfundraising@westchasepta.org.Inadditiontonewfundraisingprograms,thePTAispartneringwithourGuidanceCounselor,Mrs.KierstenRivenburg,onanewcampaigncalledKindnessCounts.Lookfornewrecognitionsandrewardsaswecontinuetopromotekindnessfromourchildren,staffandparentsthroughouttheyear.Formoreinformation,contactLauraSmithatkindnesscounts@westchasepta.org.Nowinitseighthyear,theAfter-SchoolEnrichmentProgram（ASE）isbringingbacksomefavoriteprogramsandofferingsomenewones.Studentswillhavetheopportunitytoexploreanddevelopavarietyofnewinterests.Classscheduleswillbeavailablesoon.RegistrationstartsonSept.7.FallsessionbeginsSept.21-22.Formoreinformation,contactJenniferNewmanatase@westchasepta.org.1、WhatisthepurposeoftheWizardWalk?A．Todonatetoanon-goingtrainingprogram.B．Toexchangetraditionalproducts.C．Tosupportthebuildingofanewschoolbuilding.D．Tocollectmoneyforcertainprogramsandevents.2、WhatcanwelearnaboutSpiritSticks?A．Theycanbeusedaskeyrings.B．Theyaremadebystudentsthemselves.C．Thelimitededitionstickscanbebought.D．Onlystudentswithgoodgradescangetthem.3、Ifstudentswanttodevelopanewhobby,theycangetintouchwith________.A．LauraKohler B．NikkiPivnichnyC．LauraSmith D．JenniferNewman25．（10分）Amyotrophiclateralsclerosis,morecommonlyknownasALS,affectsthenervecellsinthebrainandspinalcord(脊髓)thatmakethemusclesofboththeupperandlowerbodywork.Thosenervecellslosetheirabilitytocontrolmusclemovement,whichleadstoparalysis(瘫痪)anddeath.ItsmostfamoussuffererwasfamedphysicistStephenHawking,whodiedonMarch14,2018attheageof76.Hawking,diagnosedwiththeconditionin1963,livedwithitformorethan50years—aremarkablylongtimeforanALSsufferer.Thediseaselefthimparalyzedandcompletelydependentonothersandtechnologyforeverything:bathing,dressing,eating,mobilityandspeech.Hewasabletomoveonlyafewfingersononehand.“Itrytoleadasnormalalifeaspossible,andnotthinkaboutmycondition,orregretthethingsitpreventsmefromdoing,whicharenotthatmany,”hewroteonhiswebsite.“Ihavebeenluckythatmyconditionhasprogressedmoreslowlythanisoftenthecase.Butitshowsthatoneneednotlosehope.”Hawking’slife,includinghisbattlewithALS,wasmadeintoa2014biopic,TheTheoryofEverything,starringEddieRedmayne.TheUSCentersforDiseaseControlandPreventionsaysthat20,000to30,000peoplehaveALSintheUnitedStates,withabout5,000newcasesdiagnosedeveryyear.Peopleusuallyfindoutthattheyhaveitbetween55and75yearsofage.Onaverage,patientslivetwotofiveyearsaftersymptomsdevelop.Forreasonsnotyetunderstood,militaryveteransaretwiceaslikelytobediagnosedwithALSasthegeneralpublic,accordingtotheALSAssociation.ScientistshavebeenstudyingmanyfactorsthatcouldbelinkedwithALS,suchasheredity(遗传)andenvironmentalexposures.1、Accordingtothetext,ALS.A．islinkedwithclimatechangesB．leadstodeathinoneortwoyearsC．affectsthenervecellsalloverthebodyD．makespeoplelosecontrolofmusclemovement2、FromthetextwecaninferthatHawking.A．diedofanunknowndiseaseB．livedwithALSfor55yearsC．feltdesperateinhislastyearsD．wasparalyzedduetopoortreatment3、WhatisthesituationofALSintheUS?A．Over30,000peoplesufferfromALS.B．ALSisusuallyfoundamongtheelderlypeople.C．PatientsoftenenjoyalonglifespandespiteALS.D．Moreandmorenewcasesarereportedeveryyear.4、Whatisthetextmainlyabout?A．ThesymptomsandpossiblecuresofALS.B．AbiographicalfilmaboutStephenHawking.C．AgeneralintroductionofthediseaseofALS.D．Lifeofthefamousphysicist,StephenHawking.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）Igotanewpairofeyeglassesrecently.Becausestigmatism（去像散性）hadstartedto1withmynearsightedness，makingthingsalittlebit2Ithastakenmeseveraldaystogetusedtothenew3，Whileitwasgreatseeingclearlyata4againandwonderfulbeingableto5abookwithoutitbeinganinchfrommyface，thecombinationlenses（组合镜片）werea（n）6forme.TheproblemwasthatwheneverIwas7somethingfaraway，Ihadtokeepmyeyesup，8Iwouldgetawaveofblurriness（模糊）whenI9lookedthroughthereadingpartofthelenses.Iam10thatmyeyesarenowgettingusedtothenewglasses.Itisno11livinginanunclearworld.Ireally12thehelpofthenewglasses.Iamgratefulforthisnewpairofglassesforanotherreasontoo.Theyhavetaughtmea（n）13thatIwillholdclosetomyheartforever:Wheneveryou14toseetheroadaheadclearly，lookup！TooofteninmylifeIhavekepttheeyesofmysoullooking15totheground.WhenI16，theworldseemedlikeascary，unclear，anddepressingplace.WhenIraisedthoseeyes，though，my17alwaysbecameclear.IsawthatlifeisgoodandwhenIhelpothers，Imakeiteven18.Isawthatnomatterwhateachdaymaythrowatme，Ican19itwithalovingheartandajoyfulspirit.Wheneveryourlifeseems20oroverwhelming，justlookup！1、A．battle B．compare C．deal D．mix2、A．unusual B．impractical C．unclear D．impossible3、A．culture B．pair C．temperature D．house.4、A．distance B．length C．speed D．rate5、A．pick B．print C．translate D．read6、A．experiment B．force C．challenge D．choice7、A．listeningto B．talkingabout C．thinkingof D．lookingat8、A．otherwise B．however C．therefore D．meanwhile9、A．eventually B．accidentally. C．unfortunately D．gradually10、A．glad B．aware C．certain D．proud11、A．use B．fun C．doubt D．wonder12、A．want B．offer C．appreciate D．refuse13、A．truth B．way C．effect D．language14、A．regret B．manage C．agree D．need15、A．forward B．around C．down D．back16、A．did B．admittedto C．finished D．left17、A．interest B．view C．prejudice D．ability18、A．slower B．safer C．easier D．better19、A．lose B．push C．face D．remember20、A．exciting B．frightening C．meaningful D．peaceful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）Giftshopsinmuseumsusedtobethelaststopofeachvisit,1．peoplewouldbuysouvenirsforthemselvesandtheirfriends.Butrecentlyinsteadofbeingthelastplacepeoplegoafteravisit,they2．(become)apointofentrytothemuseum.Youmaywonder:Whatisitaboutmuseumgiftshopsthat3．(make)themsodifferent?Eachmuseumproductcontainsasmallpieceofhistory.Forexample,theBritishMuseumstorehasdifferentkindsofstickytape4．(print)withpatternsinspiredbythefamousRosettaStone,whichwasdiscoveredin1799andcontainsaninscription(碑文)helpinghistorians5．(good)understandsomeofthemostmysterious6．(Egypt)scripts.AndinthegiftshopsofChina'sPalaceMuseum,thereareearphonesinspiredbythenecklaceswornbyancientofficials.7．thedesignevolvingovertheyears,museumproductsarenolongerlimitedtofamouspaintingstobehungonthewall.8．nowmeanitemsputtouseeveryday—glasses,jewelryorcushioncovers,9．(indicate)wecannotonly“own”apieceofhistory,butalsoholditinourhands,wearitonourneck,orevensleeponit.Indeed,agreatmuseumgiftshopisanextensionofthemuseum10．(it).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。JourneytothewestareaverypopularmasterworkamongChinesepeople.ItisafantasticstorysettingintheTangDynasty.Whenopeningthebook,you’llreadaexcitingstorythatTangsengandhisthreecompanionswentthroughadventurousexperiencetogetthescriptures.Theymadealongandhardjourneywestwardsandmetalotdifficulties.ButtheMonkeyKing,alsocalledSunwukong,whomanagedtofightagainstallkindsofghosts.However,theMonkeyKingasasymbolofbeingbraveanddeterminedisdeeplovedbyusChinese.Thestoryisveryamazingthatitisreallyworthreading.AndyoucouldlearnmoreaboutChineseculturefromthebook.第二节书面表达（满分25分）29．（25分）假定你是李华，你的美国朋友Daniel写信给你，想了解你最近对高考准备的情况，并询问你高考之后的打算，问你是否有意在暑假间去美国旅行。请你给他回信，并对他的问题一一作答。注意：1.总词数100左右；2.信中不能透露任何个人信息；3.可以适当增加细节，以使行文连贯。4.信的开头和结尾已经给出，不计入总词数。DearDaniel,Iamsodelightedtohavereceivedyourletter.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________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、D3、C4、B5、B6、B7、B8、A9、D10、C11、C12、C13、C14、C15、B16、A17、A18、C19、C20、B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、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.Themajorproblemwiththespacetrashisthatitmayhitworkingsatellite