陕西省西安市华山中学2025届高三适应性调研考试英语试题含解析

陕西省西安市华山中学2025届高三适应性调研考试英语试题注意事项：1．答卷前，考生务必将自己的姓名、准考证号、考场号和座位号填写在试题卷和答题卡上。用2B铅笔将试卷类型（B）填涂在答题卡相应位置上。将条形码粘贴在答题卡右上角"条形码粘贴处"。2．作答选择题时，选出每小题答案后，用2B铅笔把答题卡上对应题目选项的答案信息点涂黑；如需改动，用橡皮擦干净后，再选涂其他答案。答案不能答在试题卷上。3．非选择题必须用黑色字迹的钢笔或签字笔作答，答案必须写在答题卡各题目指定区域内相应位置上；如需改动，先划掉原来的答案，然后再写上新答案；不准使用铅笔和涂改液。不按以上要求作答无效。4．考生必须保证答题卡的整洁。考试结束后，请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）1．8studentsand2teachersatSantaFeHighSchoolbya17-year-studentarmedwithashotgunandapistol.Thisisoneofthemanygun-relatedtragediesthathavehappenedinthelast2years.A．killedB．werekilledC．havekilledD．havebeenkilled2．Teachingasacareeristomanypeopleowingtothelongholidays.A．popular B．familiarC．attractive D．fantastic3．---Youlookhappytoday.Isthereanythinggood?---I’mverydelighted______asoneoftheexchangestudents.A．tochoose B．tohavebeenchosenC．choosing D．havingbeenchosen4．Theyoungman,________inheavytrafficontheway,gothomeanhourlaterthanusual.A．catching B．caught.C．havingcaught D．tobecaught5．_______hisoverseasstudy,hewaseventuallyemployedbyhisdreamcompany.A．Havingcompleted B．CompletingC．Completed D．Tocomplete6．HowIwishI______mymouthbeforeIshoutedatmymum!A．shut B．haveshutC．hadshut D．wouldshut7．Everyclassroominthismodernschoolis________withanewTVsetonthewallandacomputerontheteacher'sdesk.A．equippedB．decoratedC．fixedD．placed8．Bythetimewe________fromourschool,wehavebeenclosefriendsformorethantenyears.A．graduated B．willgraduateC．aregraduating D．graduate9．Ifyougotobuythetopbest-sellingCD,pleaseget______forme.A．one B．itC．this D．that10．I’mnotsureofthereasonforthedog’sillness,butit____byeatingtoomuch.A．mayhavebeencaused B．needhavebeencausedC．shouldhavebeencaused D．musthavebeencaused11．Ifweusethenewrecyclingmethod,alargenumberoftrees.A．aresaved B．willsave C．willbesaved D．havesaved12．Itwasfromonlyafewsuppliesthatshehadbroughtinthevillage____thehostesscookedsuchanicedinner.A．where B．when C．that D．which13．After________________asandstormwarningonSundayevening,meteorologistsforecastthatdustyweatherwillcontinueinpartsofthecountryonMonday.A．breakingoff B．callingoff C．leavingoff D．puttingoff14．Theworldisnotalways______wewishittobe.A．that B．whichC．what D．where15．Wecompletedonethirdoftheproject,andtheloan_______inplace,wehadtodelaytheresttillthenextmonth.A．notarranged B．wasnotarrangedC．notarranging D．hadnotbeenarranged16．Heasked______forthecomputer.A．didIpayhowmuchB．IpaidhowmuchC．howmuchdidIpayD．howmuchIpaid17．－Theonlineshopkeeperhasmadeanapologyforhisrudebehavior.－OK.Ifyou’restillnotsatisfied,youcan_______compensation.A．claim B．affordC．sacrifice D．dismiss18．---Hi,Johnson,anyideawhereSusanis?---Itisclasstime,soshe__________intheclassroomnow.A．canbe B．musthavebeenC．mighthavebeen D．shouldbe19．______youaresupposedtodo______youdon'tlikeathingis______it.Don'tcomplain.A．That;what;change B．When;that;tochangeC．What;when;change D．What;that;changing20．—Isay,Harry.Whatdidyousaytothelaid-offworkerjustnow?—Nothing.Itomyself.A．hadonlytalked B．amonlytalking C．havejusttalked D．wasjusttalking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）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．JenniferNewman23．（8分）WomeninEastAsiaareputtingtinypegsintotheirnostrilssotheirnosecouldlookmoreEuropean.ThebeautytrendapparentlystartedfromSouthKoreaabouttwoyearsagoandhasspreadtoJapan,ChinesemainlandandTaiwan,wherewomenwithapointierEuropeannoseareconsideredmoreattractive.Thebeautytrend,however,hassparkedserioushealthconcerns.InarecentcasefromChina,awomanreportedlyswallowedapegbyaccidentandthesmallitemwaslaterfoundinherstomach.Thenon-surgicalnose-liftingtrendapparentlyinvolvesasetoftoolswhicharepopularonshoppingwebsitesinEastandSouth-eastAsia.Atypicalsetconsistsoftwosmallcurvedpegs,measuringtwotothreecentimetreslong,aswellasoneadjustinghook.ThemostpopularbrandseemstocomefromSouthKorea,butvariousothercopycatproductshavecroppedupandsellforaslittleas1pound.Accordingtotheinstructionsonline,usersshouldfirstinsertthetwopegsintotheirnostrilsrespectively.Thepegsaresaidtobemadewithsilicone.Thentheyshouldusethehooktoadjustthepegssotheystandina45-degreeangleinsidethenose.OneselleronChina’spopularshoppingsite,Taobao,claimedthatbecausetheproductwasinvisible,itcouldbeawoman’ssecretweaponingettingabeautifulnosewithoutsurgery.Anadvertisementpostedbythesellersaidtheproduct,saidtobe“anti-bacteria”,couldchangetheshapeofanoseinlessthan10secondsandissafetouse.However,potentialcustomersareadvisednottowearthemformorethaneighthours.Althoughthenasalpegsarepopularamongbeauty-consciousfemales,theyhavealsobroughthealthissuestothecustomers.LastNovember,a25-year-oldwomaninTaipeinearlylosthernoseafterapegpokedthroughhernasalmembraneandcausedabacterialinfection,accordingtoAppleDaily.1、Whydowomenputtinypegsintotheirnose?A．TobeaEuropean.B．Tolookmoreappealing.C．Tofollowthetrend.D．Tobesmarter.2、AccordingtotheselleronTaobao,whatadvantagedoesthepeghave?A．Itismadefromsilicone.B．Itisabacteria-freeproduct.C．Itishiddenandnon-surgical.D．Itcostsaslittleas1pound.3、Whatmessagedoesthepassagemainlyconveytopeople?A．ThemostpopularbrandpegcomesfromSouthKorea.B．WomeninEastAsiaareputtingtinypegsintotheirnostrils.C．Peopleshouldbecautiousaboutusingbeautypegs.D．ApointierEuropeannoseisinfashionatpresent.4、Whoareintendedreadersofthepassage?A．Girlsintheirteens.B．Beauty-consciousfemales.C．Scientistsanddoctors.D．Potentialpegproducers.24．（8分）Theoldtraditionalsayingaboutsleepingwithoneeyeopeninanunfamiliarplacemaynotbetoofaroffthemark.Overthecourseofthreeexperimentson35youngandhealthyvolunteers,researchersinanewstudymeasuredbrainactivityduringtwocontinuousnightsofsleep.Sasakiandcolleaguesperformedaseriesoflabtestsbystimulatingtheleftandthentherighthemisphere(大脑的半球)withsounds.Onthesecondnight,therewasn’tanydifferenceinreactionstotestsbetweentheleftandrighthemispheres,evenduringdeepsleep.Thissuggeststhatthereisafirst-night-onlyeffectspecificallyinonehemisphereofthebrainduringdeepsleep,theauthorsconclude.Thewayparticipantsrespondedtothesleeplabtestspointstothepotentialforthebraintobeonhighalertfordangerduringthefirstnightinunfamiliarsurroundings.Whilethismaybebadnewsforbusinesstravelerswhoregularlymakebriefovernighttrips,itmaynotbeastroublesomeforpeoplewhogoawayforlongerperiodsoftime,Sasakiaddedbyemail.“Frequenttravelmayleadtounrestfulsleep,”Sasakisaid.“Butifyoustayforafewdaysatthesameplace,yoursleepmightcatchup.”Somebirdshavebeenfoundtoactuallysleepwithoneeyeopenandonesideofthebrainawakewhenthey’reinadangeroussetting,andsomemarinemammalshavesimilarabilities,theauthorsnote.Butthenewstudyfocusesonhealthyvolunteersbutnotpeoplewithinsomniaorothersleepdisorders,theauthorsnote.“Theclinicalimplicationshaven’tbeenconfirmedatthemoment,”Finan,apsychiatry（精神医学）andbehavioralhealthresearchersaid.“However,thelevelofspecificityprovidedbytheseanalysescouldbeanimportantfirststepinunderstandingwhatsleepdisorderslikeinsomnia(失眠)arisefrom,whichisthoughttobedriveninmanypatientsbycontinuinghavingalotofworries.”1、Whatdotheunderlinedwords“maynotbetoofaroffthemark”inParagraph1mean?A．MaymakesenseB．Mayberidiculous.C．MaycauseargumentsD．Maybedisturbing.2、WhatcanweknowfromParagraph3?A．Peopleareusedtowakingupandgoingtobedearlywhentravelling.B．Businesstravelersusuallyhaveabriefsleepatnight.C．Itbringsmuchtroubletothosewhostayfarawayfromtheirhomes.D．Ittakestimeforpeopletoadaptthemselvestoanewenvironment.3、AccordingtoFinan,thestudyishelpfulin________.A．findingouttherootcauseofsleepdisordersB．tellingtheeffectofworriesonsleepdisordersC．comfortingasmanypatientswithsleepdisordersaspossibleD．offeringwaystofreethepatientsfromthesufferingofsleepdisorders25．（10分）Thehumanbeingsseemtobefacingacrisis（危机）．AfterourbestGoplayersweredefeatedonebyonebytheartificialintelligence（AI）AlphaGo，welostourprideofbeingatthetopoftheintelligencechain．AndinOctober，whenSaudiArabiagavecitizenshiptoarobotnamedSophia，anotherprivilegeofbeinghumanwastakenaway．ItlookslikeeverythingthatseparateshumansandAIisatriskfightnow．Butwekeephopingthatinsteadof"everything"，there'sstillsomethingleftinusthatmakesusirreplaceable．ToHaoJingfang，winnerofthe2016HugoAwardforBestNovelette，that"something"isourconsciousness．"AlphaGoisintelligentinacertainway，butnotintelligentenoughtoasktheimportantquestions--DoIlikeplayingGo？DoIwanttoplayGotoday？WhydoIhavetoplayGowhenyoutellmeto？"sheoncesaid．Inotherwords，computerprogramsdon'thaveachoicetosay"no"．Theyprobablydon'tevenknowwhata"choice"is--alltheyeverdoiscalculate．AndtoHeHuaihong，aphilosophy（哲学）professoratPekingUniversity，imaginationandcreativityarealsowhatmakeusspecial．"Amachinecouldn'thavecomeupwiththetheoryofgravityjustbecauseitwashitbyafallingapple"，hesaid．"It'shumanimaginationthatconnectswhatseemtobecompletelyrandomandirrelevantconcepts，somethingthatamachine--whichworksbyfixedrulesonly--can'tdo，atleastfornow．"ThisiswhyBBCreporterViktorMayer-Schonbergersuggestedthatinsteadoffocusingonhowcomputershaveovershadowedusoncalculatingabilitiesthanhumans，weshouldprobably"considerourqualityatadifferentendofthespectrum（光谱）：creativity，originality（原创性），evenplainillogicalcraziness，insteadofhard-nosed（顽固的）logic"，hewrote．Somaybeinthefuture，asartificialintelligencebecomesevenmoreintelligent，humansandA1willlearntouseeachother'stalentsforgood．IfAIcanhandletheboringtaskslikecalculatinganddrivingforus，we'llhavemoretimetocreate，think，andbebusywith"beinghuman"．1、WhatcanwelearnaboutAlphaGo，accordingtoHaoJingfang？______A．Itwillbetaughttosaynointhefuture．B．Itwillbemoreintelligentthanhumansoneday．C．Ithasdifficultyansweringpersonalquestions．D．Itisunabletothinkindependentlyashumansdo．2、WhatdoesHeHuaihongbelieveisuniquetohumans？______A．Intelligence．B．Originality．C．Theabilitytomakerules．D．Theabilitytomakechoices．3、Whatdoestheunderlinedword"overshadowed"inparagraph5probablymean？______A．CompetedwithB．TakencontrolofC．BeenmoresuccessfulthanD．Influenced4、WhatcouldbethefutureofAIaccordingtotheauthor？______A．Itwillbeusedtohelphumans，ratherthancompetewithus．B．Itmaydevelopcreativitybesidesbetterlogicalthinking．C．Itmightbeverydangeroustohumansindifferentfields．D．Itwillbeappliedtoprovidedrivingserviceforhumans．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）Itisnowthirty-fiveyearssinceI,asalittleboyofsix,wasleftquitealoneintheworld.Yousentmeword1youwouldgivemeahomeandbeakindmothertome.IhaveneverforgottenthedaywhenImadethelong2oftenmilestoyourhouseinNorthKillingworth.Icanstillrecallmy3when,insteadofcomingformeyourself,yousentservantJamesto4me.Iwellremembermytearsand5as,seatedhighonyourhorseandattachedtighttoJames,Irodeofmynewhome.Night6beforewefinishedthejourney,andasitgrewdarkIbecamelonelyandafraid."Doyouthinkshe'llgotobed7wegetthere?"IaskedJamesanxiously."Oh,no,"hesaidencouragingly."She'll8foryou.Whenwegetoutofthesewoodsyou'llseehercandle9inthewindow."10wedidrideoutintotheclearing,andthere,sureenough,wasyour11Irememberyouwerewaitingatthedoor,thatyouputyourarmsclose12meandthatyouliftedme—atiredandconfusedlittlebuy—13fromthehorse.Youhadafireburningonthehearth(炉边),ahotsupper14onthestove.Aftersupperyoutookmetomynewroom,heardmesaymyprayers,andthensatbesidemeuntilIfellasleep.YouprobablyrealizewhyIam15allthistoyourmemory.SomedaysoonGodwilltakeyoutoanewhome.Don'tfearthe16forthestrangejourney,orthedarkmessengerofdeathwhowillfetchyou.Godcanbe17todoasmuchforyouasyouwerekindenoughtodoformesomanyyearsago,andyouwillbe18inGod'scare.Ishallwatchyouandprayforyoutillyouareoutofsight,19waitforthedaywhenIshallmakethesamejourneymyselfandfindyouwaitingattheendoftheroadto20me.1、A．whyB．thatC．howD．when2、A．journeyB．tourC．rideD．adventure3、A．disappointmentB．excitementC．embarrassmentD．amazement4、A．fetchB．comfortC．contactD．accompany5、A．calmnessB．pleasureC．contentmentD．anxiety6、A．wentB．droppedC．fellD．ended7、A．afterB．beforeC．sinceD．when8、A．sitdownB．standoutC．stayupD．comeover9、A．disappearingB．standingC．fadingD．shining10、A．LatelyB．ShortlyC．RecentlyD．Meanwhile11、A．heartB．mindC．candleD．gift12、A．atB．inC．forD．around13、A．downB．upC．outD．away14、A．stayingB．waitingC．heatingD．burning15、A．warningB．informingC．remindingD．recalling16、A．callingB．instructionC．evidenceD．guidance17、A．permittedB．provedC．trustedD．asked18、A．nervousB．joyfulC．desperateD．safe19、A．orratherB．incaseC．andthenD．letalone20、A．acceptB．greetC．approveD．bother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）InthepastblackpeopleinSouthAfrica1．(live)amiserablelife.Theycouldnotvotetochoosetheir2．(leader).Theycouldnotgetjobstheywanted.Thepartsoftowninwhichtheyhadtolive3．(decide)bywhitepeople.Theylivedinthe4．(poor)areasinthecountryandcouldnotgetjobstheywanted.NelsonMandela,amodernhero,calledblackpeople5．fightagainstwhitepeopletomakeblackandwhitepeopleequal.Hesaid“Wewereputinaposition6．wehadeithertoacceptwewerelessimportant,7．fighttheGovernment.Wechosetoattackthelaw.Wefirstbrokethelaw8．awaywhichwas9．(peace);whenthiswasnotallowed…onlythen10．wedecidetoanswerviolencewithviolence.”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。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。DearMr.Green,I’mwritingtotellyouhowisgoingoninourschool—abasketballmatchtobeholdingnextmonth.ThematchwillbeplayedamongXinhuaMiddleSchoolBasketballTeamandours.Nowweareorganizingabasketballteam,includedateacherasaplayer.Wehonestthinkyouaretherightone,soI’dlikeinviteyoutojoinourteam.Wehadalsoplannedtodosometrainingtobuildupourphysicalstrengthsandimproveourskills.Iamsureitwillbeagreatfun.Allofusareexpectinghimtocome.Yours,LiHua第二节书面表达（满分25分）29．（25分）假如你是李华，已髙中毕业3年，获悉母校将要举行100周年校庆，请你给远在美国的高中同桌Peter写一封电子邮件，邀请他一起回母校参加活动。要点如下：1.说明写信目的；2.校庆活动介绍；3.捐设奖学金。注意：1.词数100左右；2.可适当增加细节，以使行文连贯；3.文章的开头和结尾已给出，但不计入总词数。参考词汇：百年校庆100thanniversarycelebration奖学金scholarshipDearPeter,______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________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、C3、B4、B5、A6、C7、A8、D9、A10、A11、C12、C13、B14、C15、A16、D17、A18、D19、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、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.Thejunkvariesfromtinypiecesofpaintchippe