吉林省吉林市朝鲜族四校2023学年高三第一次调研测试英语试卷（含解析）

2023学年高考英语模拟测试卷注意事项：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．Sodifficult____ittoworkouttheproblemthatIdecidedtoaskTomforadvice.A．Ididfind B．didIfindC．Ihavefound D．haveIfound2．Dadisusedtosmokinganddrinking.There’snochance_____I’mabletotalkhiminto.A．whether;givingitupB．ofwhether;givingthemupC．that;gettingridofthemD．which;stoppingit3．_____bytheEnglishteacherforthehighgrade,Ifeltmyeffortfinallypaidoff.A．PraiseB．PraisedC．TopraiseD．Praising4．—John,doyouknowwhythesuspectwassetfree?—Forlackof________evidence.A．solidB．apparentC．ambiguousD．concrete5．Jesswassadandherfriendhelpedher___thefirstawfulweeksafterherhusbandBilldied.A．breakthrough B．breakdownC．getthrough D．getridof6．Byservingothers,apersonfocusesonsomeoneotherthanhimselforherself,________canbeveryeye-openingandrewarding.A．who B．whichC．what D．that7．Inthepastfewyears,we’veseenworksbyChinesesci-fiwriterswinninginternational______.A．conclusion B．standardC．potential D．recognition8．Lastweek,onlytwopeoplecametolookatthehouse,________wantedtobuyit.A．noneofthem B．bothofthem C．noneofwhom D．neitherofwhom9．Betweenthetwogenerations,itisoftennottheirage,_________theireducationthatcausesmisunderstanding.A．likeB．asC．orD．but10．—Youseemtobefondofclassicalmusic.—________.Asamatteroffact,Ilikejazzmusicbetter.A．Idon’tagreeB．NotreallyC．Icouldn’tagreemoreD．Nodoubt11．Sheisquite____toofficework.Youhadbetterofferhersomesuggestionswhennecessary．A．familiar B．freshC．similar D．sensitive12．Myfriendwarnedme______goingtotheEastCoastbecauseitwascrowdedwithtourists.A．by B．against C．on D．for13．TheteachercalledTomtohisofficebecausehewascaughtintheexam.A．tocheat B．cheating C．cheated D．cheat14．—HowIwishIhadworkedharderwhenIwasinthatcompany.—Ifyouhad,you_________adepartmentmanagernow.A．are B．wouldbeC．wouldhavebeen D．were15．Ifyouthinkthattheillnessmightbeserious,youshouldnot_________goingtothedoctor.A．putoff B．setaboutC．holdback D．giveaway16．Repairsofhistoricbuildingshavetobe_____theoriginalstructure.A．insympathywithB．insearchofC．inresponsetoD．incontrastto17．Iwasanonlychild,and________Ihadnoexperienceoflargefamilies.A．soB．butC．orD．while18．Yet_______intheprocessofdevelopmentdidtheystoptoconsidertheimpactoftheir“progress”onnature.A．innotimeB．atnopointC．aslikelyasnotD．moreoftenthannot19．---_____shouldwelookdownuponthepoor.---I’mwithyouonthat.A．Byallmeans B．Byanymeans C．Bymeansof D．Bynomeans20．—Alice,whyaren’tyouatworktoday?—Iadayoff． A．havegiven B．havebeengiven C．gave D．wasgiven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）Durian(榴莲)isprobablythesmelliestfruitintheworld,lettingoutanunusualunpleasantsmellwhichwouldmakeanyonebringup.However,nobodywasawareofwhatgavethisfruititsuniquesmell,soateamofresearchersfromSingaporedecidedtotakealookatitsgenome(基因组)andfindout,Durianiswell-knownthroughoutSoutheastAsiaasthekingoffruits,mostlybecauseofitsawfulappearanceandsmell.However,theoriginofthisunpleasantsmellwasunknown,soresearchersdecidedtomapthegenomeofthefruit,andfindthegenethatcontrolledit.Agroupofgenes,volatilesulfurcompounds(含硫化合物),becameveryactiveinthefruit,andtheywerefoundresponsibleforresultingintheunpleasantsmell.Thefruitconfuseseveryonewithasulfuricsmell,likerottenonionsandingredients.Thesmelllastslong,mostlybecausethefruitcontainsmorevolatilesulfurcompounds.Otherspeciesusuallybenefitfromtwogenecopiesatmost,butdurianhasfour,leadingtothestrikingsmell.However,thissmellmightbeanadvantagefordurianinthewild.Althoughwefinditunpleasant,manyanimalsmightbeattractedbyit.Iftheyeatthefruit,thentheycaneasilyspreaditsseedseverywhere,thuscontributingtothedistributionofthespecies.Themappingoftheduriangenomealsoshowedsomeotherinformationonthespecies.Firstofall,thefruithasanimpressivenumberofgenes,namely46,000.Also,withthehelpofthesegenes,theysawhowitevolved,anddiscovereditwasrelatedtothecacaotree.AlltheotherdiscoverieshavebeenpublishedinthejournalNatureGenetics.Despitethestrikingsmell,manypeopleactuallyenjoyeatingthefruit.However,notalldurianspeciesareedible,andsomeofthemmayevencausedamagetoourhealth,Evenso,thefruitisoftenimported,significantlycontributingtotheeconomy.1、Whatgivedurianitsuniquesmell?A．Onionsnearby.B．Twogenecopies.C．Rotteningredientsinit.D．Volatilesulfurcompounds.2、Whatdoestheunderlinedword“evolved”inParagraph5probablymean?A．Developed.B．Escaped.C．Predicted.D．Tolerated.3、Whatcanweinferfromthetext?A．Nobirdsenjoyeatingdurian.B．Duriancanbeplantedallovertheworld.C．Someofdurianspeciescannotbeeaten.D．Durianhasnorelationshipwiththecacaotree.4、What’sthebesttitleforthetext?A．What’sDurian?B．TheInfluenceoftheSmellC．TheDistributionofDurianD．TheMysteryoftheUnpleasantSmellofDurian22．（8分）Anewtechnologyisgoingtoripe,onethatcouldtransformourdailylives,helptoformnewindustries,evenremoveworldeconomicpowersfromtheirpresentpositions.UnlikethewaveofindustrializationthatbeganintheWestandspreadlatertotherestoftheworld,thenewdevelopmentsaretakingplaceinresearchlabsallovertheglobe—andAsiansareintheforefront.Physicistsarecreatinganewclassofmaterialsthatdisplayanamazingpropertyunforeseeneventwoyearsago—superconductivity(超导体技术).Usedtodayonlyinspecializedequipment,superconductorshavethepotentialtoradicallychangemostoftheelectricalandelectronicappliancesfoundinthehome,makingthemsmaller,morepowerfulandefficient.Theycouldfreeourcitiesofpollutionbyreplacingpetrolanddiesel(柴油)vehicleswithelectriccars,andcutthecostofelectricity.Thenewmaterialsdosomethingthateventhebestofconductorssuchascopperandsilvercannot—theydoawaywithallelectricalresistance.Thesignificancesforenergystoragearegreat.Thetechnologyisinitsearlystage,stillaccessibletocountriesthatdecidetoinvestbrainsandmoney.For75yearsithadremainedlittlemorethanascientificcuriositywithlimitedpracticalusebecausethephenomenonoccurredonlyatextremelylowtemperatures.Itwasfirstobservedin1911byaDutchscientistnamedHeikeKamerlinghOnnes,whocooledmercury(水银)totemperaturesbelow-269℃withliquidhelium(氦).TheninJanuarylastyear,twoIBMscientists,K.AlexMullerandJ.GeorgeBednorz,foundametaloxideceramic(氧化陶瓷)thatsuperconductedat-243℃.TheirreportwentlargelyunnoticeduntillastDecember,whenitwasconfirmedatascientificmeetinginBoston.TodayJapan,India,ChinaandotherAsiancountriesallhavetheirshareofexpertswhospendtheirdaysandnightsinlabs,actingasmidwives(助产士)toanewtechnology.1、Asisindicatedinthepassage,thetechnologyofsuperconductivity____________.A．hasalreadybeendevelopedB．isstillunderdevelopmentC．willbeusedonlyinspecializedequipmentD．willbeusedindailylivesinafewyears2、Thenewtechnologydiffersfromtheothersinthat____________.A．itbeganintheEastandspreadlatertotherestoftheworldB．itbeganintheWestandspreadlatertotherestoftheworldC．itisbeingcultivatedinresearchlabsaroundtheworldD．itisaccessibletophysicistswhoareintelligentandrich3、Fromthepassage,wemayconcludethat____________.A．AsianscientistsgaintheleadinthegrowthofthenewtechnologyB．Dutchscientistskeptreportingnewfindingsforthelast75yearsC．IBMscientists'reportreceiveimmediateattentionallovertheworldD．theWestwasastonishedatthenewtechnologydevelopedbytheAsians4、Whichofthefollowingwouldbethebesttitleforthepassage?A．TheProspectofaNewTechnologyB．Superconductivity:ANewTechnologyC．ANewTechnology:TheKeytoChangetheWayofOurLivesD．ANewTechnology:AJointEffortofManyCountries23．（8分）WhenNoahReady-Campbellwasayoungadult,heworkedforhisfather’sconstructioncompany.Backthen,hedreamedofadaywhenrobotsmighttakeoverthedirty,repetitive（重复的）partsofhisjob,suchasearthmoving.Yearslater,Ready-CampbelllefthisjobasanengineerwithGoogletomakethatdreamcometrue.Ready-CampbellformedacompanycalledBuiltRobotics,whichdevelopstechnologytoproduceself-drivingheavyequipment.Ready-Campbellsaysthecompany’sgoalistomakeconstructionsafer,fasterandlesscostly.Theconstructionindustrystrugglestofindskilledworkersandfacesagrowingnumberofunfinishedprojects.Butself-operatingmachinesarechangingthenatureofbuilding.WorkersatBerichMasonryinEnglewood,Colorado,recentlyspentseveralweekslearninghowtooperatearobotcalledSAM,ortheSemi-AutomatedMason.SAMisa$400,000machinefromthecompanyConstructionRobotics,Itcanlay3,000bricksineighthours.That’sseveraltimesmorethanahumanbricklayercandointhesameperiod.ButhumansarestillneededtoloadbricksintotheSAMandmakesureitworksright.BricklayerMichaelWalshsaystheSAMlessenstheloadonhisbody.Buthedoesn’tthinkitwilltakehisjob.BrianKennedyagrees,too.HisorganizationsupportstherightsofconstructionworkersintheUnitedStatesandCanada.Kennedysaystheunionisnotworriedthatmachineswillreplacehumanworkersanytimesoon.Theriseofconstructionrobotscomesasthebuildingindustryfacesaseveredecreaseinlaborsupply.Onerecentstudyshowedthat70percentofconstructionbusinesseshaveadifficulttimefindingskilledworkers.MikeMoyheadsaminingoperationforthebuildingmaterialssupplierLehighHanson.Hesaysit’sdifficulttofindpeoplewhoevenknowhowtooperatesomeofthenecessaryequipment.“Nobodywantstogettheirhandsdirtyanymore.Theywantanice,cleanjobinanoffice,”henoted.1、WhatdoesthefirstparagraphsayaboutNoahReady-Campbell?A．Heenjoysdoingrepetitivework.B．HeisnowanemployeeofGoogle.C．Heusedtoworkinconstructionfield.D．HejoinedGoogletorealizethatdream.2、WhichofthefollowingisoneoftheaimsofBuiltRobotics?A．Increasingconstructionspeed.B．Enlargingconstructionquantity.C．Improvingconstructiondesigns.D．Changingconstructionsteps.3、WhatcanbeinferredaboutSAMfromthetext?A．Itcantotallyreplacehumanbricklayers.B．Itiscomplexlybuiltbuteasytooperate.C．Itisunabletoworkcompletelyautomatically.D．Itischeapbutworksmuchfasterthanhumans.4、InMikeMoy’sopinion,whatpreventsmanyconstructionbusinessesfromfindingskilledworkers?A．Theirlowpay.B．Theirpotentialrisks.C．Theirheavyworkloads.D．Theirpoorworkingconditions.24．（8分）Despitehiskneeandfingerinjuries,KobeBryantignoreshispainsastheNBAseasonnears.HeisleadingtheLosAngelesLakersintheirattempttowinathirdNBAchampionshipinarow,astheydidatthebeginningofthecentury.TheLosAnglesLakerssuperstarhastheperfectrecordsincehisstartin1996.HehasfiveNBAchampionships,12NBAAll-StarsandagoldmedalattheBeijingOlympics.Butalongwiththeawards,therehaslongbeentalkaboutBryant.Peoplesayheisaselfishplayerwithonlyafewfriends.HewonthreeNBAchampionshiptitleswithShaquilleO’Neal,butratherthanbecomingfriends,theycouldn’tgetalongwellwitheachother.LakersCoachPhilJacksonstillremembersatalkheandBryanthad.“Italkedtohimalittlebitaboutleadershipandhisabilitytobealeader,andhesaidhewasreadytobeacaptain”JacksontoldESPN.“ButIsaidnoonewasreadytofollowhim.Bryant’spathofself-discoverytookhimLightyears.O’NeallefttheLakersin2004.Bryantwentontoleadtheteamtovictorylastyearandagainthissummer.Lastweek,NBArookies(新秀）votedBryanttheirfavoriteplayer.MarkMedina,sportsreporterwiththeLosAnglesTimeshasseenBryantgrow.“Kobehasbeenimprovinghisrelationshipwithteammatesandacceptsthatsometimeslessismore,”hewrote.“Hehaslearnedthathehastogivetogetbackinreturn.Andsohehasbecomeagiverratherthanademandingleader.Thathasbeengreatforhimandgreattowatch,”JacksontoldMedina.Bryanthasshownthroughtalentandhardworkthatotherscanfollowhislead.1、WhatcanweknowaboutKobeandO’Neal?A．Theywereinconflict.B．Theyweregoodfriends.C．Theyenviedeachother.D．Theyoftenhelpedothers.2、WhatcanwelearnfromJackson’swords?A．Hedidn’tlikeKobeorO’Neal.B．Kobehadnotalentforleadership.C．Kobe’sleadershipshouldbeimproved.D．Kobe’steammatespreferredO’Nealtohim.3、Kobedevelopedhisrelationshipwithhisteammatesby.A．invitingO'NealtocomebackB．learningtobecomeagiverC．winningthetrustofthecoachD．turningademandingleader4、Whatmaybethebesttitleforthepassage?A．Agrown-upNBAstarB．Ahard-workingNBAstarC．ThehighpraisefromKobe’scoachD．TherelationshipbetweentwoNBAstars25．（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）ThebestgraduationspeechI’veeverheardwasonlyfiveminuteslong.Itgotastandingovation(热烈鼓掌)---somethingIneversawbeforeata1ceremony.Mostsurprisingofall,thespeakerwasaneighthgrader.ItwasmydaughterAbridlle.Sure,I’dgivenher2----“Makethemlaugh,makethemthink,andmakethemcry”---andsheletmereadand3onhertext,butshestressedthatthiswastobeher4,notmine.Anditwas.Itwasunique,notjustin5butinacharmingdelivery.Shetoldfunnystories,makingfunofherself,herclassmates,and6herteachers.Thenshe7theteachersandledtheaudiencetogiveabigcheerforthem,onlytoconclude,“Okey,teachersare8,butlet’snotgetcarriedaway.Gettingan9isasidebenefit.Therealpurposeofmiddleschoolistomakefriendsandhavefun----amIright?”Thenshechangedthemood,10herclassmatestothinkaboutthethreeyearsof11adolescentemotion----conversations,fights,12deepestthoughts,andcryingoneachothers’13.Summingup,shesaid,“14wethinkbacktotheseyears,wewillthinkaboutwhat15tousandaroundus.Butwhatwas16themostimportantwaswhathappened17us.”“Whenallissaidanddone,”she18,“thecrucialyearswespentinmiddleschoolwerereallyabout19...andyouknowwhat?That’swhathighschoolisgoingtobelike.And,infact,the20ofourlives.”1、A．marriageB．graduationC．closingD．opening2、A．moneyB．loveC．adviceD．respect3、A．workB．takeC．commentD．depend4、A．practiceB．performanceC．lectureD．speech5、A．contentB．formC．styleD．fact6、A．absolutelyB．exactlyC．speciallyD．especially7、A．scoldedB．blamedC．mentionedD．praised8、A．strictB．importantC．seriousD．available9、A．awardB．honorC．educationD．academy10、A．remindingB．wantingC．persuadingD．convincing11、A．tenderB．intenseC．personalD．natural12、A．sharingB．givingawayC．tellingD．speakingof13、A．sidesB．backsC．shouldersD．desks14、A．IfB．WhenC．SinceD．While15、A．contributedB．referredC．ledD．happened16、A．reallyB．rarelyC．hardlyD．merely17、A．toB．inC．aroundD．with18、A．saidB．criedC．shoutedD．added19、A．growingupB．bringingupC．breakingupD．takingup20、A．focusB．valueC．restD．part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）Coffeeisan1．(importance)partofItalianculture.IhavedrunkalotofitsinceIarrivedheresixmonthsago.ThecoffeecultureinItalyis2．(complete)differentfromthatintheUK.InItaly,whenyouorder3．cupofcoffeeinacafe,youarepresentedwithatiny,bitterespresso(浓咖啡).TakeawaycoffeeisverypopularamongtheBritish,butitisnotcommoninItaly,espe-ciallyinthose4．(area)wheretherearefewtourists.Generally,peopleinItalyprefertodrinktheirtinycoffeewhiletheyarestandingatthebar.Formanyof5．(they),thisshortbreakisapartoftheirday.BreakfastinabarinItaly6．(include)acoffeeandapastry(糕点).Cappuccinos(卡布奇诺咖啡)areverypopularatbreakfast.Acupofcappuccinoistheperfectwayof7．(start)thedayforme.Ithinkit’sniceforpeople8．(go)toabartohaveacoffeeforbreakfastbeforework.Finally,athing9．hasbeenfoundbymeisthatcoffeeinItalyismuchcheaper.ThatmeansinItalyitispossibletogooutforcoffeeeveryday10．spendingmuchmoney.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。LuYonggen,anacademicianattheChineseAcademyofSciences,hasdonatedlifesavingsof8、8millionsyuantoeducationalcauses、The87-year-oldscientistsayshisachievementswouldnothavebeenpossiblewiththeCommunistPartyofChina,butthatheiswillingtomakehislastcontributiontothecountry、InMarch,Luandhiswifetransferredallthemoneytheysaveditinmorethan10bankaccountstoSouthChinaAgriculturalUniversitytoestablishtheeducationalfundsponsoringpoverty-strickenstudentsandtalentedyoungteachers、Luherselfalsoworkshardinthefieldofricegenetics,climbingmountainsin2001attheageof70tofindwildrice、Duringthepastfiveyears,hefostered33newvarietiesofriceseedswhataregrownonlandcovering600,000hectares、Despiteafamousscientist,Lulivesasimplyandhumblelife,usingbrokenfurnituredatedbacktothe1980sinhishome、第二节书面表达（满分25分）29．（25分）假如你是李华，你的美国笔友Jenny正在做一份关于中国移动支付（mobilepayment）的问卷调查（survey），你是她的重点采访对象．内容包括：1．你或你身边的人在日常生活中使用移动支付的情况；2．移动支付带来的好处；3．你的看法．参考词汇：微信：Wechat支付宝：Alipay二维码：QRcode注意：1．词数100左右；2．可适当增加细节，以使行文连贯．DearJenny，Howisyoursurveyonmobilepaymentgoing？____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Yoursfaithfully，LiHua

2023学年模拟测试卷参考答案（含详细解析）第一部分（共20小题，每小题1.5分，满分30分）1、B2、C3、B4、A5、C6、B7、D8、D9、C10、B11、B12、B13、B14、B15、A16、A17、A18、B19、D20、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、1、D2、A3、C4、D22、1、B2、C3、A4、B23、1、C2、A3、C4、D24、1、A2、C3、B4、A25、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.Groundstationshavebeenbuilttomonitorlarger