北京市海淀区知春里中学2024年高考英语四模试卷含解析_第1页
北京市海淀区知春里中学2024年高考英语四模试卷含解析_第2页
北京市海淀区知春里中学2024年高考英语四模试卷含解析_第3页
北京市海淀区知春里中学2024年高考英语四模试卷含解析_第4页
北京市海淀区知春里中学2024年高考英语四模试卷含解析_第5页
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北京市海淀区知春里中学2024年高考英语四模试卷考生须知:1.全卷分选择题和非选择题两部分,全部在答题纸上作答。选择题必须用2B铅笔填涂;非选择题的答案必须用黑色字迹的钢笔或答字笔写在“答题纸”相应位置上。2.请用黑色字迹的钢笔或答字笔在“答题纸”上先填写姓名和准考证号。3.保持卡面清洁,不要折叠,不要弄破、弄皱,在草稿纸、试题卷上答题无效。第一部分(共20小题,每小题1.5分,满分30分)1.Theweatherturnedouttobefine.I_____________thetroubletocarrytheumbrellawithme.A.shouldhavetaken B.musthavetakenC.couldn'thavetaken D.needn'thavetaken2.TheBrownsheld_______theycalled“familyday”onceeachyear.A.that B.what C.which D.when3.Totellthetruth,IwouldratherI________thepaininsteadofyou.Youdon’tknowhowworriedIwas.A.took B.hadtakenC.havetaken D.shouldhavetaken4.Theywereabroadduringthemonthswhenwewerecarryingouttheinvestigation,orthey__________toourhelp.A.wouldhavecome B.couldcomeC.havecome D.hadcome5.—Canyoudomeafavour,Mr.Smith?Mycar______start.—Noproblem.Youcancountonit.A.won’tB.mustn’tC.needn’tD.shouldn’t6.Pandasare_____tothemountainsofcentralChinaandonlyabout1,000remaininthewild.A.native B.sensitive C.relate D.familiar7.—CanIpaythebillbycheck?—Sorry,sir.Accordingtotherulesofourhotel,thepayment______bemadeincash.A.shallB.needC.willD.can8.Theycarryout________checksonmilkproductstomakesurethattheyareofhighquality.A.commonB.naturalC.ordinaryD.regular9.——Congratulationsonyourpromotion.Gooutfordinner,OK?——Good!__________,justyouandme.A.FollowmeB.MytreatC.MypleasureD.Allowme10.Ifthetrafficsoheavy,Icouldhavebeenbackby6o’clock.A.hadn’tbeen B.wasn’tC.couldn’tbe D.hasn’tbeen11.--Mum,Idon’tthinkIamqualifiedenoughtodothis.--Honey,beconfident!Youshouldknowitis____amanthinksofhimself___reallydetermineshisfate.A.that;thatB.how;thatC.what;thatD.how;that12.Sympathyfortherebels,thegovernmentclaimed,isbeginningto______becauseofmoreandmoreharmtheydidtocommonpeople.A.fade B.decline C.fail D.collapse13.Halfwaythroughthechapter____Ididn’ttakeanythingin.A.didIrealize B.hadIrealizedC.Irealized D.Iwouldrealize14.Sometimeswehavetofaceembarrassingmoments________wecanonlykeepsilent.A.who B.whichC.when D.why15.---Eachofthestudentsworkinghardattheirhardattheirlessonsthebook.---SohaveI.A.readsB.havereadC.hasreadD.read16.---DoyouknowwhatTomdoesallday?----IknowhespendsatleastasmuchtimewatchingTVashe____________hislessons.A.isdoing B.does C.spendstodo D.doesdoing17.Wehavestrong________forbelievingthatthenewly-inventedmaterialisnotonlypopularbutalsoamonumenttotheeco-friendlylifestyle.A.grounds B.reasons C.causes D.purposes18.Sheisquite________toofficework.Youhadbetterofferhersomesuggestionswhennecessary.A.familiar B.similarC.fresh D.sensitive19.—Onlythosewhohavealotincommoncangetalongwell.—_________.Oppositessometimesdoattract.A.Ihopenot B.IthinksoC.Iappreciatethat D.Ibegtodiffer20.Althoughwarstillexistsonourplanet,Idobelieveit’spossiblefordifferentethnicgroupstolivetogetherin______.A.agreementB.harmonyC.connectionD.comparison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)EveryoneshouldbesoluckyastohaveafriendlikeFranciaRaisa.OnThursday,singerandactressSelenaGomez,25,usedInstagramtoexplainwhyshewas“layinglow”thissummer.ShepostedaphotoofherselfinahospitalbedwithherfriendFranciaRaisaholdinghands.Shesaidsherecentlyreceivedakidneytransplantfromherbestfriendbecauseofcomplications(并发症)fromlupus(狼疮),anautoimmunedisease,whichmeansitistheresultoftheimmunesystemattackingnormaltissue,includingthekidneys,brain,heartandlungs.Peoplewithlupusmayfirstexperiencetiredness,jointpainoralittlebitofrash(皮疹)ontheirbodiesandcangoforalongtimebeforetheirdoctorsrealizeitismoreserious.Manypeopleseetwoorfourdoctorsbeforetherealproblemispickedup.AccordingtoDr.KyriakosKirou,roughlyathirdtoone-halfofpeoplewithlupusdevelopkidneydisease,anduptooneinfiveofthemwilleventuallyneedatransplant,sometimesbecausetheyweren’ttreatedwitheffectivedrugstopreventtheimmunesystemfromattackingthekidneys.ThoughGomezsaidthatshewas“verywellnow,”shewarnedaboutthedangersofnottakingmedicaldiagnosesseriously,likesheinitiallydid.HerInstagrampostalsocalledattentiontotwomajorhealthtopics:theneedforlivingorgandonatorsandthefactthatGomezrepresentsthreegroupsmorelikelytobediagnosedwithlupusandlupus-relatedkidneydisease.Nineoutof10peoplediagnosedwithlupusarewomen,andmostdevelopthediseasebetweentheagesof15to44.Andlupusistwotothreetimesmorecommonamongwomenofcolor,includingHispanicwomen,accordingtotheLupusFoundation.RaisaisLatina,andGomez’sfatherisofMexicanorigin.Whileit’snotessentialthattheorgandonatorandreceiverbeofthesameethnicity,peoplewhoshareasimilarbackgroundsometimesarebettermatched,accordingtodatafromtheUnitedNetworkforOrganSharing.1、WhatcanwelearnaboutFranciaRaisa?A.Sheislucky.B.Sheisselfless.C.Sheisoptimistic.D.Sheisencouraging.2、Whatislupuslikeatitsearlystage?A.Itisdeadly.B.Itishardtorecognize.C.Itssymptomsarepsychological.D.Itremindsyouofakidneydisease.3、Whatdoestheunderlinedword“them”inParagraph2referto?A.Peoplewithlupus.B.Coloredwomenlupuspatients.C.Lupuspatientswithkidneydisease.D.Womenbetweentheagesof15to44.4、Whatdoesthelastparagraphmainlytellus?A.RaisaandGomezhaveasimilarbackground.B.GomezhasfullyrecoveredthankstothekidneyfromRaisa.C.Itisvitalforthedonatorandreceivertobeofthesamerace.D.Theorganfromthedonatorofthesameracematchesthereceiverbetter.22.(8分)Hitsongsarebigbusiness,sothereisanincentiveforcomposerstogetthoseingredientsthatmightincreasetheirchancesofsuccess.Butsongsarecomplexmixturesoffeatures.Howtoanalysethemismademoredifficultbythefactthatwhatispopularchangesovertime.ButNataliaKomarova,amathematicianattheUniversityofCalifornia,Irvine,thinksshehascrackedtheproblem.Hercomputeranalysissuggeststhatthesongscurrentlypreferredbyconsumersaredanceable,party-likenumbers.Unfortunately,thoseactuallywritingsongsprefersomethingelse.SheandhercolleaguescollectedinformationonmusicreleasedinBritainbetween1985and2015.Theylookedinmusic“metadata(元数据)’’thatareusedbymusicloversandareoftentappedintobyacademics.Metadataareinformationaboutthenatureofasongthatcangivelistenersanideaofwhatthatsongislikebeforetheyhearit.Dr.Komarovaandherteamwerepresentedwithmorethan500,000songstodetectnumerousmusicalfeatures.Theteamfedallofthisinformationintoacomputerandcomparedthefeaturesofsongsthathadmadeitintothecharts(排行榜)withthoseofsongsthathadnot.Overall,theteam’sresultssuggestedthatchartsuccesseswerehappierandbrighterthantheaveragesongsreleasedduringthesameyear.Charttopperswerealsomorelikelythanaveragesongstohavebeenperformedbywomen.Dr.Komarovausedtheseresultstotrainhercomputertotrytopredictwhetherarandomlypresentedsongwaslikelytohavebeenahitinagivenyear.Themachinecorrectlypredictedsuccess75%ofthetime,comparedwiththatfromthemusicdatabase.Contentisn’teverything.Asmightbeexpected,circumstances,particularlyanyfamealreadyattachedtoarecordingartistorartists,hadaneffecttoo.Butnotahugeone.Thatsuggeststhatmusicalfameisactuallyattachedtotalent,ratherthantoadvertising.Andthisisalessonforanindustrythatsomebelieveisnotconnectedenoughtotalent.1、Whyisitdifficulttotellwhatmakesgoodmusic?A.Whatpeoplethinkispopularchangeswiththetime.B.Whatsomepeoplethinkpopularisn’tforotherpeople.C.Noonecaresaboutwhatmakespopularmusic.D.It’sdifficulttoknowthefeaturesofpopularmusic.2、Whatcanweinferfromtheresultsoftheteam’sresearch?A.Thecontentofgoodmusiccanbetypedintocomputers.B.Goodmusichasthequalitytomakepeoplethinkaboutlife.C.Happierandbrightersongsaremorelikelytomakethecharts.D.Analysiscandecideinadvancewhetherasongwillbepopular.3、Whatdoestheunderlinedword“incentive”inParagraph1mean?A.Expression.B.Motivation.C.Exhibition.D.Division.4、What’stherelationshipbetweenmusicalfameandthesinger?A.Afamoussingerwillmakeanymusiche/shesingspopular.B.Goodmusicdependsonwhetherthesingeriswidelyadvertised.C.Agoodfemalesingercanmakeanaveragesongpopular.D.Talentismoreimportantthanfametomakeasongpopular.23.(8分)WelcometoSummerFun4Kids-theUKdirectoryofSummerCampsandCourses.Thelongsummerholidaysareincreasinglyrecognizedasagreatopportunityforyoungpeopletotakepartinorganizedactivities,playschemes(儿童游戏活动计划)ordaycampseitherwithintheirlocalareaonadailybasisorlivingawayfromhomeatanAmerican-styleresidentialSummerCamp.ThisdirectoryaimstoprovideasummaryofavailableopportunitiesthroughouttheUKaswellasbackgroundinformationandusefullinks.DayCampsDayCampsusuallyrunfromMondaystoFridaysofferavariedprogrammeofsports,adventureorcreativeactivitiesthroughouteachday.Arrivalanddeparturetimesvarybutusuallyinvolveastartingtimebetween9:00-10:00a.m.andacollectiontimebetween4:00-5:00p.m..DayCampsareprovidedforyoungpeoplelivingwithintheimmediatecatchmentareaofthevenue(会场服务区),butsomeofferasupervisedtransportservicefromawidercatchmentarea.Agegroupsfrom3yearsandabove.HolidayPlayschemesPlayschemesareusuallyrunbyvoluntaryorganizationsorlocalauthorities.Playschemesmayberestrictedtospecificactivities(SportsorArts&Crafts)orinvolvearangeofdifferentactivities.Someplayschemesmayinvolveoffsitetrips.Playschemesareprovidedmostlyforyoungpeoplelivingwithintheimmediatecatchmentareaofthevenue.Agegroupsfrom3yearsandabove.Sports/ActivityCoursesSpecialistcoursesinsingleactivitiesorsports.Thesecoursesusuallytake2or3hoursperday,lastinganythingfromasingledaytoaprogressivecourseover4or5consecutive(连续的)days.Sportscoursesareusuallyledbyqualifiedinstructorsorcoachesandnationalgoverningbodyawardsmaybeachieved,subjecttothelengthofcourse.Sportscoursesareoftenorganizedbylocalauthoritysportscentresorspecialistcenters(RidingSchools,WatersportsCenters,etc).Agegroupsfrom7yearsandabove.Multi-ActivityProgrammesorcoursesinvolvingacombinationofactivitiesratherthanaspecialistcourse.Typicallymulti-activityprogrammesinvolvebetween4-6activitysessionsperday,witheachactivitysessionlastingbetween1-1.5hours.Thistypeofcourseusuallyfocuseson“taster”orintroductorysessionsinarangeofactivitiessuchassports,adventure,creativeandperformingartsactivities.Agegroupsfrom3yearsandabove.1、TheaimofSummerFun4Kidsis.A.toorganizeplayschemesorcampsforkidsB.togatherinformationandusefullinksC.toprovidealistofavailableopportunitiesD.tomakeenoughmoneythroughsomeactivities2、IfyouchooseDayCampsforyourkid,.A.he/shewillspendsevendaysaweekthereB.he/shemaytakeariskoflosinglifeC.he/shewillstaythereatleast6hoursadayD.he/shewillhavetogrowupasateenager3、AkidenteringforSportscourses.A.willhavesomeoffsitetripswithcoachesB.maybeadmittedtoakeyuniversityinthefutureC.willturnintoaqualifiedinstructorD.shouldbeatleast7orabove24.(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.Howtotakeaplane25.(10分)TheArtofTravelPhotographyCourseonDVD$99.95$29.95Mostofuswouldn’tdreamoftravellingwithoutbringingacameraalong.Photographsnotonlyletusshareourexperienceswithothers,buttheypreserveonce-in-a-lifetimemomentspreciselythewaywewanttorememberthem.Yetalltoooften,wefindthatourphotosfallshortofourexpectations.Andourdullresultsaremadeallthemoredisappointingbytheknowledgethatwemayneverreturntothepicturedlocale.We’vealllearnedhowdifficultitcanbetocapture(捕捉)themagicofthemoment.Butbyunderstandingsomebasicphotographicprinciplesandbestpractices,youcandevelopyourphotographer’seyeandproducepicturesthatreachtheirfullpotential.TheArtofTravelPhotographyisyourtickettocapturingthebeautyandaweofanyscene,anywhereintheworld.YourguideisJoelSartore,NationalGeographiccontributingphotographerwithmorethan30yearsofexperiencewhohastravelledtheworldshootingphotographsinthemostchallengingofconditions.Filledwithpracticaltipsandproventechniques,thiscoursehelpsyoulearntoseethewayprofessionalphotographersdosoyoucantakecompellingphotographsworthframingandsharing.1、Whatmightmakeyoufeelregretaboutyourbadphotosaccordingtothead?A.Thatyourprecioustimeiswasted.B.Thatyoulackphotographicskills.C.Thatscarcelycantheyberetaken.D.Thatit’shardtocaptureidealsights.2、WhichofthefollowingisTRUE?A.JoelSartorewillteachyouphotographywhiletravellingwithyou.B.JoelSartorewillconveyhisexperiencetowhowantstotakenicephotos.C.TheArtofTravelPhotographyisacollectionofJoelSartore'sphotos.D.TheArtofTravelPhotographywillfreeyoufromworriesaboutphotos.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)OneofthegreatestconcertsIeverattendednevertookplaceatall.Notquite,anyway.Instead,aviolent1,whichcameprettymuchoutofnowhereonasummernight,lefttheSaratogaPerformingArtsCenterwithoutelectricalpower.The

2

stormhitjustminutesbeforethePhiladelphiaOrchestra(交响乐团)wasabouttotakethe3

alongwithaguestsoloist,theviolinistSarahChang.Forty-fiveminuteslater,theaudiencewerestill

4,hopingpowerwouldberestoredandthe

5

wouldgetunderway.That’swhenChang

6

ontothestage,aloneexceptforher

7

andacoupleofstagehandsequippedwithflashlightsto

8

herandhermusic.Theorchestra

9

backstage.ButChangbeganplayingFritzKreisler’s

RecitativoandScherzo-Caprice.Maybetherainwasstillpoundingontheroofand

10

thegrass.Maybethethunderhadn’tdiedaway

11

bydistance.Chancesare,though,noone12

thatnightcouldtellyoutherewasanythingatallintheairexceptthe

13.Theperformancewas

14,butitwasdeliveredwithbothskillandgrace—asortof“

15”

cardfortheaudience’spresenceandpatience.Theapplausewas

16.then,severalthousandmusiclovers17

throughpoolingrainwaterand

18

totheircars.Maybethestoryendsrightthere.Butthethen-twenty-year-oldmusician’s

19

forthepeoplecomingtohearhermusicsayssomethingabouttheessentialrelationshipbetweenartistandaudience.MaybeSarahChangunderstoodthatwhensheofferedhermusicasa

20

thatnight,withoutpoweredloudspeakerandinthenear-darknessofasummereveningstorm.1、A.floodB.earthquakeC.thunderstormD.fire2、A.globalB.unexpectedC.regularD.uncertain3、A.chanceB.actionC.troubleD.stage4、A.shoutingB.strugglingC.waitingD.gathering5、A.concertB.rainC.danceD.sunlight6、A.climbedB.steppedC.jumpedD.held7、A.pianoB.conductorC.violinD.band8、A.admireB.broadcastC.circleD.light9、A.remainedB.occupiedC.hidD.worked10、A.floodingB.cleaningC.irrigatingD.destroying11、A.eitherB.yetC.everD.just12、A.screamingB.complainingC.performingD.listening13、A.violinistB.lightingC.musicD.cheering14、A.briefB.successfulC.boringD.embarrassing15、A.allrightB.nevermindC.don’tworryD.thankyou16、A.weakB.enthusiasticC.frequentD.permanent17、A.losttheircontrolB.traveledC.madetheirwayD.looked18、A.awayB.downC.outD.back19、A.respectB.analysisC.generosityD.tolerance20、A.trickB.giftC.reliefD.mercy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)Englishhaschangedand1.(develop)whenculturesmeetandcommunicate2.eachother.FromaboutAD450to1150,new3.(settle)toEnglandenrichedtheEnglishlanguageand4.vocabulary.In1620,someBritishpeoplebegantomovetoothercountries,and5.(gradual),English6.(speak)inmanyothercountries.Bythe19thcenturyAmericanEnglishspellinggotaseparateidentity7.NoahWebsterwrotehisdictionary.8.present,peoplespeakEnglishastheirsecondor9.foreignlanguageinSouthAsia.Chinamayhavethe10.(large)numberofEnglishlearners.第四部分写作(共两节)第一节短文改错(满分10分)28.(10分)短文改错DearRon,Iamveryexcitingtohearthatyouarecomingtoourschoolsoon.Nowletmetointroduceourschooltoyou.Ourschoolisaveryfamouslyschoolwithlonghistory.Wehavemanyexperiencedteachersandexcellentequipments.Therearetwoteachingbuildings;oneisforseniorsandtheothersisforjuniors.Therearetwolabbuildingsoralibrary.ExceptChinese,maths,English,physicsandchemistry,wehavesomeoptionalcourses.Thestudentscanchoosethattheyliketoattend.Weloveourschool.Iamlookingforwardtomeetyousoon.Yourssincerely,LiHua36第二节书面表达(满分25分)29.(25分)假定你是李华,英国网友Tom对你的家乡菜很感兴趣,你买了一本英文版的中国地方菜谱(localrecipe)快递给他,请给他写一封电子邮件提醒他接收,内容包括:1.礼物简介;2.预计收件时间。注意:1.词数100左右;2.可以适当增加细节,以使行文连贯。______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

参考答案第一部分(共20小题,每小题1.5分,满分30分)1、D2、B3、B4、A5、A6、A7、A8、D9、B10、A11、C12、A13、C14、C15、C16、D17、A18、C19、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、B2、B3、C4、D22、1、A2、C3、B4、D23、1、C2、C3、D24、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.Groundstationshavebeenbuiltt

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