浙江省深化课程改革协作校2025届高三第二次诊断性检测英语试卷含解析2

浙江省深化课程改革协作校2025届高三第二次诊断性检测英语试卷注意事项1．考生要认真填写考场号和座位序号。2．试题所有答案必须填涂或书写在答题卡上，在试卷上作答无效。第一部分必须用2B铅笔作答；第二部分必须用黑色字迹的签字笔作答。3．考试结束后，考生须将试卷和答题卡放在桌面上，待监考员收回。第一部分（共20小题，每小题1.5分，满分30分）1．Totellthetruth,Ididn’texpectthatthereweresomanypeople______theidea.A．supportedB．supportingC．tosupportD．havingsupported2．Thankstothe“sugartax”，foodfactorieshavereducedsugarintheirproducts,________about45millionkilogramsofsugar.A．tosaveB．savedC．savingD．havingsaved3．Thisisthefirsttimethatyourparentshavebeenabroad,______?A．haven’tthey B．hasn’tit C．aren’tthey D．isn’tit4．theirfinalmedicalcheck,theastronautsboardedtheirspacecraft． A．Received B．Beingreceived C．Toreceive D．Havingreceived5．Computer-controlledrobotsaretakingoverjobsinmanyindustries,whichusedtobedone_______.A．artificiallyB．manuallyC．comprehensivelyD．gradually6．Thiscarisimportanttoourfamily.Wewouldrepairitatourexpense_______itbreakdownwithinthefirstyear.A．could B．wouldC．might D．should7．Onthesurfaceofthewater________,whichspoiledthebeautifulsceneryofthepark.A．somedeadleavesdidfloat B．somedeadleavesfloatedC．floatedsomedeadleaves D．didsomedeadleavesfloat8．Justasthefamousman_____it,“Anythingonemancanimagine,othermencanmake____real.”A．says,it B．put,/ C．says,/ D．put,them9．Jane’sgrandmotherhadwantedtowritechildren’sbookformanyyears,butonethingoranotheralwaysgotinway.A．a;不填 B．the;theC．不填;the D．a;the10．—Ihavenoideawhatmadethestudentssoexcitedandcrazy.—______ithavebeentheirteam’svictoryinthefinals?A．Must B．CouldC．Would D．Should11．Heisn’tsuchaman______heusedtobe.A．who B．whomC．that D．as12．Fathermadeapromise______________Ididwellintheentranceexam,hewouldtakemetoHongKonginthesummervacation.A．ifthat B．ifC．thatif D．that13．Thedocumentfilm______nextweekaimsatintroducinglocalculturestotheworld.A．released B．beingreleasedC．tobereleased D．havingbeenreleased14．Betweenthetwogenerations,itisoftennottheirage,_________theireducationthatcausesmisunderstanding.A．likeB．asC．orD．but15．Iwillgiveyousomearticleswhichyoucanwhenyouwritethereport.A．referto B．applyto C．leadto D．talkto16．Everymanhashisfaults.Weshould,therefore,leantobe________ofothers.A．ignorant B．responsibleC．reliable D．tolerant17．Nowadays,moreandmoreyoungladies,figuresmostarefineenough,aregoingonadiet.A．who B．whoseC．ofwhose D．ofwhom18．（2018·海淀二模）Thisviewiscommon_________allsectionsofthecommunity.A．acrossB．aboveC．aroundD．along19．________enoughmoney,theyoungmanwasunabletobuyhisgirlfriendexpensivejewelry.A．Nottosave B．NotsavingC．Nothavingsaved D．Notsaved20．TheOxfordEnglishDictionaryisnecessaryforlearningEnglish,soyou'dbetterbuy___.A．this B．that C．it D．one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）IwasfirstintroducedtoPuppiesBehindBars(PBB)whenIwatchedaspecialonAnimalPlanet.Thisnon-profitorganizationisthebrainchildofGloriaGilbertStoga,akind-heartedwomanfromNewYorkPBBisaprograminwhichspecially-selectedprisonersfromprisonsaretrainedinthepreparationofpuppiestobecomeservicedogsforthehandicapped(残疾人),orpolicedogstoservepoliceforces.MywifeandIweresomovedwhenwewatchedtheprogram.Itisawin-winsituationatallpoints.First,itmakesaprisoner,whomayneverhavethechancetobereleased,gobacktothecommunitybyjoininginthisprogramandofferingeveryminuteofeverydayworking,loving,andtrainingapuppyforfutureservice.Itisdifficultforthem,buttheyrealizetheimportanceofthisprogram.Inaddition,mostofthemhavethechance(forthefirsttimeintheirlives)toexperiencewarmlovethroughananimal.Second,theprogramsavestensofthousandsofdollarsthatitwouldcosttotrainthesedogsthroughtraditionalways.Alldonationstotheprogramareusedtobuydogfood,trainingsupplies,andveterinarycare.Finally,oursocietybenefitsfromservicedogswhichcanprotectpeoplefromdanger,searchandrescuehumansafteraseriousdisaster,orbecomethelifelineforahandicappedperson.Thelastofthesegoesfarbeyondthefactthatdogscanopen.Fridges,answerthephoneordoadozenotherdailytasks.Theygiveasenseoffreedombacktoapersonwhohashadittakenawaybyillness,accident,orwarfare.Becauseofthiswehavegivenalotofmonetarysupportofthismeaningfulprogram.1、Whatdoestheunderlinedword"brainchild"inParagraph1probablymean?A．Founder.B．Idea.C．Pain.D．Wealth.2、InPuppiesBehindBarswecanfinddogsthat_______.A．arebeingtrainedforthegovernmentB．willbeadoptedbyprisonersC．willservethedisabledandpoliceD．canplaygameswithchildren3、Thedonationsofthisprogramwill_______.A．beforpolicemenandprisonersB．bespentonthingsfordogsC．beusedtotraindogsintraditionalwaysD．behandedouttothedisabled4、Whatistheauthor'spurposeofwritingthetext?A．Toaskpeopletosupportthepolice.B．ToindicatethesignificanceofPBB．C．Tocallonpeopletocarefordogs.D．TopraiseGloriaandherworkmates.22．（8分）Whenwasthelasttimeyousentapostcard?TheUK’sfamily-ownedoldestpostcardfirm,whichhasbeenpublishingpostcardsandcalendarssince1880,willclosethisDecember.Thereason?Itsaysinsteadofpenningacard,peopleareputtingphotosuponFacebookorInstagramorusingWhatsApptoshowfriendsaridfamilyathomejusthowmuchfunthey’rehaving.Ifyougetapostcardfromsomeonewho’sawaysomewhere,it’sasmuchthethoughtthatthey’vegonethroughthehassle(麻烦)ofchoosingapostcard,workingoutwheretogetastampfrom,findingapostboxandthenthepostcardmakingthatjourneythroughtoyou.That’sthevalueofthepostcard．Butthattimehasgone．BrothersCharlesandHarrySalmon,thefifthgenerationofthefamilytorunthefirm,saidthepopularityofsocialmediahadhadahugeimpactonthebusiness.Peoplearealsotendingtotakeshorterholidays,meaningtheyarelikelytohavearrivedhomelongbeforetheirpostcards.Asaresultthebusinesswasnolongerviable.“Increasinglychallengingtradingconditionsandchangestothenatureandsizeofthemarketforitspublicationshaveresultedinuncertaintyoverthefutureofitstrade,”thebrotherswroteinalettertosuppliersandnewsagents.Asaresulttheywereannouncingaproposaltowithdrawfrompublishing.Thenumberofpostcardssoldeachyearisreportedtohaveseenasharpdeclinetoaboutfivemillionfrom20millionjust25yearsago.Butthefirmsaidthataswellasthedropinthenumberofpostcardssent.“wehavealsohadtoconsiderthattherearenomoremembersofthefamilywhowishtojointhebusiness."1、Whatisthebesttitleofthetext?A．UK’soldestpostcardfirmsettocloseB．PostcardindustryboominginthefutureC．UK'spostcardfirmthroughatoughtimeD．Postcardindustryneedingsupporttosurvive2、What’sthevalueofsendingapostcard?A．It’sajourneyofloveB．It’sasymbolofsympathyC．It’sanactofpatienceD．It’sawayofpassingtime3、Whatdoestheunderlinedword“viable"inParagraph3probablymean?A．WorthofpraiseB．PossibletochangeC．ShortofmoneyD．likelytoexist4、Wheredoesthistextprobablycomefrom?A．AbusinesscolumnB．AfinancereportC．Ahi-techadvertisementD．Abookreview23．（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．Howtotakeaplane24．（8分）Asfreeastheymakeus,mobilephonesstillneedtostayclosetoapowersource.Soonthatmaychangewith"green"power.ThreeChileanstudentsgottheideaforaplant-powereddevice(装置)tochargetheircellphones,whilesittingintheirschool'soutdoorcourtyardduringabreakfromexams,withdeadmobilephones.Then,oneofthemhadan"aha"moment.“ItoccurredtoCamilatosayaboutplants,"saidinventorEvelynAravena."Whydon'tyouhaveasocket,iftherearesomanyplants?'Afterthat,wethought,whydon'ttheyhaveachargingoutlet?Becausetherearesomanyplantsandlivingthingsthathavethepotentialtoproduceenergy,whynot?'"Theirinvention—asmallbiologicalcircuitcalledE-Kaia-usestheenergyplantstoproduceduringphotosynthesis(光合作用).Aplantusesonlyasmallpartofthatenergyandtherestgoesintothesoil,andthat'swheretheE-Kaiacollectsit.Thedeviceplugsintothegroundandthenintoyourphone."It'sthemostamazingprojectI'veeverseeninmylife,plainandsimple.Theybroughtthisoriginalmodel,anditworked—andthat'swhenitallchanged,atleastfrommypersonalpointofviewandIbegantosupportthem."saidMauricioCifuentes.Thedevicesolvedtwoproblemsfortheengineeringstudents—theyneededanideaforaclassproject,andanoutlettoplugintheirphones."Lookingforaplacetochargethenotebook,whichhadnopower,andthemobilephones,weweren'tabletofindanythingbecausealltheotherstudentswereinthesamestateofmadnesstryingtofindaplacetochargetheirdevices,"saidAravena.Butplantsareeverywhere,andthebiocircuitmakesthebestoftheirexcess(过多的)power.TheE-Kaiadoesn'tcarrymuchchargebutit'spowerfulenoughtocompletelyrechargeamobilephoneinlessthantwohours.Thestudentinventorshaveappliedforpatentsontheirtechnology,andexpecttheE-KaiatogoonsaleinDecember2016.1、Howcouldthestudentsgetthe"green"poweridea?A．Bycarryingoutanexperiment.B．Justfromanoccasionalthought.C．Withthesupportoftheirprofessors.D．Enlightened(启发)bytheinformationinasciencebook.2、Howdoesthedevicework?A．Byusingtheenergyduringphotosynthesis.B．Byusingasmallbiologicalcircuit.C．Byusingtheelectricitystoredinthedevice.D．Byusingadeviceburiedintheground.3、WhatcanwelearnfromwhatMauricioCifuentessaid?A．Heintendedtobuythepatent.B．Thedevicewasmadeinaroughway.C．Heshowedgreatinterestinthedevice.D．Heattemptedtoproducethedeviceinlargenumbers.4、Whatmightbethebesttitleforthepassage?A．ANewDevicetoChangetheWorldB．GreenPower-ANewandPotentialSourceC．ChileanStudentsFindAGreenWaytoChargePhonesD．ANewDeviceInventedbyChileanStudentsWillBeonSale25．（10分）Chinabecamethefirstcountrytocloneamonkeyusingnon-reproductivecells,reducingtheneedtobreedlabmonkeysandpavingthewayformoreaccurate,effectiveandaffordableanimaltestsfornewdrugs,scientistssaidonThursday.ByDecember,theInstituteofNeuroscienceoftheChineseAcademyofScienceshadcreatedtwoclonemacaques(猕猴)named”ZhongZhong”and“HuaHua”bynucleartransferringofsomaticcells(体细胞)-anycellintheorganismotherthanreproductivecells.Tetra,amonkeybornin1999,istheworld'sfirstclonedmonkey,butitwasdonebyusingasimplermethodcalledembryosplitting(胚胎分割);butitcouldonlygeneratefourclonedoffspringatatimeandcannotbegeneticallychangedtosuittheexperimentalneed.Cloningamonkeyusingsomaticcellshasbeenaworld-classchallengebecauseitisaprimate(灵长类)thatsharesitsgeneticmakeup,andthereforeallofitscomplexity,withhumans.Fordrugandotherlabtests,scientistshavetopurchasemonkeysfromallovertheworld,whichiscostlyandbadfortheenvironment,andproducesinaccurateresultsbecauseeachmonkeymighthavedifferentgenes.Bycloningmonkeyusingsomaticcells,wecanmassivelycultivatelargenumbersofgeneticallyidenticaloffspringinashortamountoftime,andwecanevenchangetheirgenestosuitourneeds.Thiscansavetime,cutdownexperimentcosts,andproducemoreaccurateresults,leadingtomoreeffectivemedicine.SunQiang,directorofthenon-humanprimateresearchfacilityattheinstitute,saidmostofthedrugtrialsarecurrentlydoneonlabmice.However,drugsthatworkonmicemightnotworkorevenhaveseveresideeffectsonhumansbecausethetwospeciesaresodifferent“Monkeysandhumansarebothprimates,sotheyaremuchcloselyrelatedandtestingonmonkeysissupposedtobeaseffectiveastestingonhumans,”hesaid.Thisisespeciallyusefulintestingdrugsforneural(神经的)diseasessuchasParkinson’sdisease,metabolicsyndrome(代谢综合症)andimmunesystemdiseases,andtumors,headded.“ThisachievementwillhelpChinaleadtheworldresearchintheinternationalscienceprojectsrelatedtoneuralmappingofprimatebrains,"hesaid."However,biolabsfromtheUnitedStates,Japan,andEuropeancountriesarealsoverycapable,andtheywillquicklycatchupwithChinaafterthemonkeycloningtechnologyismadepublic,"Sunadded.“Thismeanswehavetoinnovatecontinuouslyandworkextrahardthisyeartostayahead,"hesaid.1、Whichofthefollowingisthemostimportantfactorincloningmacaquesnamed"ZhongZhong"and"HuaHua"?A．Reproductivecells.B．SomaticcellsC．Neuralmapping.D．Geneticmakeup2、Whyiscloningmonkeyssodifficult?A．Becauseitisbadforourenvironment.B．Becauseeachmonkeymighthavedifferentgenes.C．Becausemonkeys'geneticmakeupisascomplicatedashumans.D．Becauseitistooexpensivetoworkontheirgeneticmakeup.3、WhatisthemainideaofParagraph8?A．Thecureforneuraldiseases.B．Theprocessofcloningmonkeys.C．Thesignificanceofcloningmonkeys.D．Thecloserelationsbetweenmonkeysandhumans.4、Whatcanweinferfromthispassage?A．Moreeffectivemedicinewillbeproduced.B．Drugtrialsonlabmicewillbeabandoned.C．Chinaisthefirstcountrytohaveclonedmonkeys.D．Chinawillstayaheadoftheworldincloning.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）OneeveningIwasleavingfromasupermarket.AsI1mycar,Inoticedthatsomepersonstoodbesideme.Hewastheonethatcouldbe422asabum(流浪汉).Itseemedthathewashomeless.I3thathewouldaskmeformoney,buthedidnotdothat.Heonlysaid,“Yourcarisverynice.”Afterseveralmomentsof4,Ireplied,“Thanks.”Andthentheinnervoice5tome,“Askhimifheneedshelp.”Afterashort6Iaskedhimthat.Hisresponsewas7.Iwillneverforgetthosesimplethreewords“Don’tweall?”Itwasatrue8tome.Ineedhelp,justasthose9.Ihadmoneyandaplacetosleep,butI10neededhelp.ThenIopenedmywalletandofferedhimenoughmoneytogetsomeshelterforaday.11Iunderstoodthatnomatterhowmuchmoney,12,luxurythingswehave,weallneedhelp.Andontheotherhand,nomatterhowpooryouare,howmany13problemsyouhave,youstillmightbegiving.14it’sjustaniceword,itcanbe15tootherpeople.Maybethatmanwasjustahomelessstranger,buttomehewas16that.Maybehewasamansentto17methatthereisonething,amongall18,whichisveryimportantandcannotbe19foreveryperson.Actually,itisatruegiftandit’scalled20.1、A．leftB．lockedC．approachedD．parked2、A．turndownB．referredtoC．leftbehindD．keptaway3、A．expectedB．understoodC．admittedD．recognized4、A．contactB．absenceC．conversationD．silence5、A．respondedB．reactedC．appealedD．whispered6、A．hesitationB．distanceC．driveD．break7、A．casualB．cautiousC．astonishingD．charming8、A．defeatB．explorationC．discoveryD．challenge9、A．inrealityB．introubleC．indangerD．inaction10、A．stillB．evenC．onlyD．already11、A．PreviouslyB．ObviouslyC．GenerallyD．Suddenly12、A．achievementsB．talentsC．potentialsD．budgets13、A．medicalB．materialC．absurdD．theoretical14、A．IfonlyB．NowthatC．EventhoughD．Incase15、A．pricelessB．harmlessC．blamelessD．useless16、A．otherthanB．morethanC．ratherthanD．lessthan17、A．warnB．promiseC．remindD．assure18、A．effortsB．memoriesC．factorsD．values19、A．substitutedB．assignedC．separatedD．betrayed20、A．helpB．givingC．faithD．accepting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）NewYorkFashionWeek’sannualfall/wintercollectionhadasurprisingadditionthisseason.She’sTaoHuabi,the71-year-oldfounderofLaoGanMachilisauce.PortraitsofTaowereprintedondesignerhoodies(卫衣）.Theeventwaspart1．thefashionweek’sChinaDaypromotion—ajointeffortwithe-commercegiantAlibaba.Theactivityaims2．(put)popularChinesebrandsonaninternationalstage.UnderneathTao’sportraitwereprintedtheChinesecharactersfor“laoganma.”Therightandleftsleeves,respectively,showEnglishwords‘‘saucesqueen.’andtheChinesecharactersfor“nationaldiva(国民女神Theitem3．(sell)intheU.S.throughoutNewYorkFashionWeekfor$120.Athomeitwasgivenawayas4．surprisegifttocustomers5．purchasedLaoGanMafoodproductsonTmallonChinaDay.Theywerealso,ofcourse,soldonTmall.ManyChinesenetizensfeel6．(strong)nostalgic(怀旧的）forthesaucesthathavedelightedtheirtastebudsfortwodecades.Tao7．(found)theLaoGanMacompanyin1997,andhassinceexpandedherbusinessintoa7.5-billion-yuanempire.Todayhernameissynonymouswith(与...同义）thebrand8．(it),andherproductsarebelovedby9．(local)andforeignersalike.Thisseason,Tao’schilisaucesisoneofseveraldomesticbrands10．(invite)byAlibabatofeatureatNewYorkFashionWeek.OthersincludeatraditionalChinesemedicinecompany,cosmeticbrands,andamineralwatercompany.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。MyclassmatesandIdecidetodosomethingforourcominggraduation、Aftertheheateddiscussion,weagreedonmakingavideotorecordtheirschoollifeexperiences、Materialcollectingtookusawholeweek—weinterviewedourteachersortookpicturesofalmosteveryaspectofourschoollife、Edittheinterviewvideosandpicturesweretough、Wedebatedaboutwhattoputintothevideo、Somecompromisesandargumentswereunavoidable,butthevideoturnedouttobeperfectly、Severaldayslater,whenthevideoplayedatthegraduationceremony,itwaswellreceived、Thestudentsandteachershadagreattime、Thatsurelygaveusagreatsenseofachievements、第二节书面表达（满分25分）29．（25分）2017年10月29日襄阳市第一次举办了国际马拉松比赛，李华的肯尼亚朋友Mike也前来参加。现在他已回国，想写封感谢信给李华，要点如下：1.参加襄马的感受；2.感谢李华的招待（带领参观景点；品尝美食)；3.邀请李华到肯尼亚做客。参考词汇：马拉松marathon肯尼亚Kenya要求：1.词数120左右；2.可适当增加内容使行文连贯；3.信的开头和结尾巳写好，不计入总词数。DearliHua,Howisitgoing?I'mwritingtoconvey.Yours,Mike

参考答案第一部分（共20小题，每小题1.5分，满分30分）1、B2、C3、D4、D5、B6、D7、C8、B9、D10、B11、D12、C13、C14、C15、A16、D17、C18、A19、C20、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、C3、B4、B22、1、A2、A3、D4、A23、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,piec