陕西西安地区八校2022年高考考前提分英语仿真卷含答案

2021-2022高考英语模拟试卷注意事项：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．Theshockingnewsmademerealize______terribleproblemswewouldface.A.that B．how C．what D．why2．--Hello,Kate.Howisyourweekendathome?--Awful!YouknowitisthefirsttimeI____aloneathome,boredtodeath.A．hasleft B．hadleft C．hadbeenleft D．havebeenleft3．Theimportance______anationaldayandhowitiscelebratedareverydifferentfromcountrytocountry.A．connectedto B．givento C．meaningto D．attachedto4．Iquicklyloweredmyself,duckingmyheadtoavoidlookingdirectlyintohiseyessothathewouldn'tfeel________.A．challenged B．challengingC．tobechallenged D．havingchallenged5．TheteachercalledTomtohisofficebecausehewascaughtintheexam.A．tocheat B．cheating C．cheated D．cheat6．Wearesotired.______wecouldtakethedayofftomorrow!A．OnlyifB．WhatifC．IfonlyD．Ifso7．Duetothereformandopening­up,ourlivingconditions,undoubtedly,haveimproved________overthepastdecades.A．considerately B．approximately C．appropriately D．considerably8．Topgraduatesfromuniversitiesare________bymajorcompanies.A．chased B．registeredC．offered D．compromised9．–Excuseme,sir,didn’tyouseetheredlight?–Sorry,mymind________somewhereelse.A．hasbeenwandering B．waswanderedC．waswandering D．hasbeenwandered10．Theaimofthegovernmentistomakeeverycitizenbetteroff,____,tohelpthemliveahappylife．A．asaresult B．forastartC．foronething D．inotherwords11．Newly________chairmanoftheChineseBasketballAssociation,YaoMinghasputreformingthedomesticgame’smanagementatthetopofhisagenda.A．appointing B．appointedC．beingappointed D．havingappointed12．—Doyou________readyforthespringouting?—No,Istillhavetobuysomefruit.A．everything B．anything C．something D．nothing13．________aboutthemanwearingsunglassesduringnightthathewasdeterminedtofollowhim.A．SocuriousthedetectivewasB．SocuriouswasthedetectiveC．HowcuriouswasthedetectiveD．Howcuriousthedetectivewas14．语音知识(共5小题；每小题l分，满分5分)从A、B、C、D四个选项中，找出其划线部分与所给单词的划线部分读音相同的选项。并在答题卡上将该项涂黑。15．Itiswidelyacknowledgedthatstudentsshouldbe____________intermsofoverallquality.A．supported B．matchedC．evaluated D．controlled16．CanyoucomeonMondayofTuesday？I'mafraid__________dayispossible.A．either B．neitherC．some D．any17．Scientistshavecometotheconclusion___________thetemperatureonEarthisgettinghigherandhigher.A．What B．thatC．which D．when18．Peterson,agreatarchaeologist,said:“Archaeologistshavebeenextremelypatientbecausewewereledtobelievethattheministrywas________thisproblem,butwefeelthatwecan'twaitanylonger.”A．lookingout B．bringingout C．carryingout D．sortingout19．—HowdidyoulikeJohn’sexhibitionofpaintingslastweekend?—Totellyouthetruth,hispaintingsdidn’t________memuch.A.referto B．appealto C．belongto D．occurto20．Tom’scommentsonthisissueareconfusingbecausetheyappearto______theremarksonthesameissuemadeearlierbyhim.A．violateB．induceC．clarifyD．contradict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）Trumanheadedhomefromschool,withthehomeworkinmind,areportonbeehives(蜂巢).Truman’sclasshadstudiedbeesforthreedays,sohewasready.But,ashisteacherMrs.Lawrencehadexplained,toearnanA+，heneededa“newangle”.Trumanpushedopenthefrontdoortofindhisfour-year-oldbrother,Bryan,sittingonthelivingroomrag,hardatwork.Papertoweltubeswerealloverthefloor.Bryanquicklystoodup.“Truman,helpmebuildacity!”“I’dliketo,”Trumanreplied,“butIhavetodoareportonbeehivesand...”“CanIhelpyou?”Bryanbegged.“Idon’tthinkso,Bry.Sorry.’’“Iknowwherethere’sabeehive.”Bryansmiled.“Where?”“Inthewoodpilebythegarage.’’Theboysmarchedtothefirewood.Bendingdown,Bryanpointedoutthehivedeepinsidethepile.Trumancarefullyremovedthehiveout.“Yougotit!”Bryanshouted.Backinthelivingroom,Trumanpacedaround,turningthefragilehiveunderhisnose.Eachcellwasaperfecthexagon(六边形).Howdidthebeesfitthecellstogethersoneatly?Andhowdidtheymakeeachcellsix-sided?Couldtheycount?Lostinthought,hisfootcamedownonsomething...“Truman!You’reminingmycity!”“Getyourstupidtubesoutofhere，Bryan!I’mtryingto…”Thetoweltubesonthefloorsuddenlyremindedhimofsomething.Thebeehive!Lookingcloser,henoticedthetubeswerearrangedwithoneinthemiddle,surroundedbysixothers,justlikethecellsofthehive.Justtobesure,hetriedfiveandthenseventubessurroundingthecentertubes,butneitherwayfit.Sixwastheonlynumberthatworked.“Beesdon’tcounttosix,”hesaidaloud.“Thecellshavetobesix-sided.TrumanrantoBryanandthrewhisarmsaroundhisbrother.Bryan,youdidit!NowIcanbuildamodelbeehivewithyourtubes!Imean—ifit’sO.K.withyou.”1、WheredidTrumanfindthebeehive?A．InBryan’scity.B．Insidethegarage.C．Inthelivingroom.D．Insidethewoodpile.2、Whatdoweknowaboutthebeehive?A．ItwashiddenbyBryan.B．Itwaseasytobreak.C．ItwasruinedbyTruman.D．Itwasaperfecthexagon.3、HowdidTrumanprobablyfinishhishomeworkintheend?A．Withhisteacher’said.B．Bybuildingacity.C．WithBryan’shelp.D．Bykillingthebees.22．（8分）Must-readBooksthatAreHittingtheBigScreenThisYearTheZookeeper’sWifebyDianeAckermanStarring:JessicaChastainandJohanHeldenberghReleaseDate:July31,2017Thistruestoryisbothheartbreakingandheartwarming.AckermanartfullyretellsthestoryofJanandZabinskiandhowtheyusedtheirzootosaveoverthreehundredpeoplefromtheNazis.Aftertheirzoowasbombed,theymanagedtohidepeopleinanimalcages,givinganimalnamestotheirguestsandhumannamestotheiranimals.Thisisonestorywetrulyhopelivesuptothehopeonfilm.TheLostCityofZbyDavidGrannStarring:SiennaMillerandRobertPattinsonReleaseDate:August14,2017Lookingforadventure?Thisstoryisjustwhatyouneed.Thebook(andfilm)tellsthetaleofBritishexplorerPercyFawcettandhowheventuredintotheAmazonjunglein1925,nevertoreturn.It'sanenchantingmysterythatwecan’twaittoseeplayoutonscreen.TheDinnerbyHermanKochStarring:RichardGereandRebeccaHallReleaseDate:October5,2017Wealwayssaywe'ddoabsolutelyanythingforourkids,right?Thestorybeginswithtwocouplespolitely,eatingdinnertogether,avoidingaconversationabouttheirchildrenwhohavecommittedahorrificact.Asthestorygoeson,you'llseejusthowfartheseparentswillgotoprotecttheonestheylove.TheCirclebyDaveEggersStarring:EmmaWatsonandPattonOswaltReleaseDate:November28,2017Ayoungwoman,Mae,ishiredtoworkforapowerfulInternetcompanyandFeelslikeshe'shitthejobjackpot.Thefacilityisveryadvanced,lively,andabitwild.Mae'sstorybeginsasoneofambitionbutsoontumsintoaheart-racingstoryofsuspense.1、WhydidJanandZabinskiputpeopleinanimalcages?A．Toofferthemlivingplaces B．TotreatthemasanimalsC．Toavoidbeingbombed D．TohidefromtheNazis2、Whoplaystheroleofamodernwhite-collarwoman?A．EmmaWatson B．RebeccaHallC．SiennaMiller D．JessicaChastain3、Whencanyougotoseethefilmifyouenjoyadventurestories?A．InJuly B．InAugustC．InOctober D．InNovember4、Whichofthefollowingisrelatedtoparents'raisingkids?A．TheZookeeper'sWife B．TheLostCityofZC．TheDinner D．TheCircle23．（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）PearlopenedhereyeswhenEzraturnedapageofhismagazine.Shepulledoffherquilt.“Ezra,”shesaid.“IfIcouldjusthavesomewater,”shetoldhim.Hepoureditfromthewater-pot.Sheheardnoicecubesclinking(叮当声);theymusthavemelted.Yetitseemedjustminutesagothathe’dbroughtinawholenewsupply.Heraisedherhead,resteditonhisshoulder,andtippedtheglasstoherlips.Yes,half-heated—notthatsheminded.Shedrankgratefully,keepinghereyesclosed.Hisshoulderfeltsteadyandcomforting.Helaidherbackdownonthepillow.“DR.Vincent’scomingatten,”hetoldher.“Whattimeisitnow?”“Eight-thirty.”“Eight-thirtyinthemorning?”“Yes.”“Haveyoubeenhereallnight?”sheasked.“Isleptalittle.”“Sleepnow.Iwon’tbeneedingyou.”“Well,maybeafterthedoctorcomes.”ItwasimportanttoPearlthatshedeceivethedoctor.Shedidn’twanttogotothehospital.Herillnesswaspneumonia(肺炎),shewasalmostcertain;sheguesseditfromapastexperience.Sherecognizedthewayitsettledintoherback.IfDr.Vincentfoundouthewouldtakeheroutofherownbed,herownhouse,andsendherofftoUnionMemorial,tentheroverwithplastic.“Maybeyoushouldcancelthedoctoraltogether,”shetoldEzra.“I’mverymuchimproved,Ibelieve.”“Lethimdecidethat.”“Well,Iknowhowmyownselffeels,Ezra.”“Wewon’targueaboutitjustnow,”hesaid.1、（小题1）WhereisPearlinthepassageabove?A．Inthehospital.B．StayingwithEzraathishouse.C．Athome.D．Atahealthclinic.2、（小题2）Pearlhasspentthenight________.A．talkingtoEzraaboutthepastB．makingplanstogotothehospitalC．worryingaboutthefutureD．sleepinginherbed3、（小题3）Howdoesthewriterletoutthepassingoftimeinthefirstparagraph?A．Theicecubesinthewater-pothavemelt.B．Thewaterinthewater-potiscold.C．Ezrahasfinallyarrived.D．Pearlcloseshereyesanddreams.4、（小题4）IfEzraknewthatPearlhadpneumonia,hewouldmostprobably________.A．agreetoletherstaywheresheisB．agreetolietothedoctoraboutherillnessC．insistthatshegotothehospitalD．askanotherdoctorforasecondopinion25．（10分）Feifei,an11-year-oldboyfromXuzhou,JiangsuProvince,sufferedfromasuddenacuteeyediseasewhichhasalmostledtoblindness.Thediseasewascausedbyexcessive(过度的)eyefatigue(疲劳)duringthewintervacation,duringwhichheplayedcomputergamesforcontinuous10daysandnights.ManyyoungstersinChinanowadaysareincreasinglyaddictedtocomputergamesandotherelectronicproducts.Thisisfollowedbyaseriesofhealthproblems,withthemosttypicalcasebeingmyopia,ornearsightedness.AccordingtothelatestresearchreportreleasedbytheWorldHealthOrganization(WHO),themyopiarateamongChineseteenagersranksfirstintheworld—70percentofhighschoolandcollegestudents.Therateisnearly40percentinprimaryschoolstudents,whileitisonly10percentfortheirpeersintheUnitedStates.Thereareatleast10millionpeopleinChinawithseveremyopia,andtheyarelikelytogetpathological(病理性的)myopiainmiddleage.Pathologicalmyopiacan'tbetreatedwithglassesorsurgery,anditisoneofthebiggestfactorsthatleadtoblindness,XuXun,directoroftheophthalmology(眼科学)departmentatShanghaiGeneralHospital,pointedout.ExpertsexplainthattwomajorfactorsleadtothehighrateofmyopiaamongChinesepeople.Oneishighacademicpressure,andtheotheroneisexcessiveuseofelectronicdevicesoveralongperiodoftime.Genetics,ontheotherhand,arenotthemainreason,asonly20percentofChinesepeoplehadmyopiainthe1960s."Teenagersarenowfacedwithsevereacademicpressure,whichmeanstheyoftenstudywithoutnaturallight.Thisincreasestheirriskofbecomingnearsighted,"Xusaid.Expertssuggestthatyoungstersmaintainaproperbalancebetweenstudyandrestsoastoprotecttheireyesight,andparentsshouldplayanactiveroleintheprocess.1、WhydoestheauthormentionFeifei'sexperienceinthefirstparagraph?A．Toadvisepeopletoprotecttheireyes.B．Tointroducethetopicofnearsightedness.C．Toinformpeopleofthecauseofblindness.D．ToshowthatFeifeidevelopedaneyedisease.2、Whatcanbelearntfromthepassage?A．Nearsightednessmaycauseotherhealthproblems.B．TherearemorenearsightedstudentsintheUnitedStates.C．70percentChinesestudentsinprimaryschoolarenearsighted.D．Pathologicalmyopiaismostlikelytocauseblindness.3、Whichofthefollowingcanbeamainreasonformyopia?A．Geneticsfactors.B．Lowacademicpressure.C．Overuseofelectronicdevices.D．Readinginnaturallight.4、Whatwillbeprobablydiscussedinthefollowingparagraph?A．Thesignificanceofprotectingeyesight.B．Youngsters’badbehaviorleadingtomyopia.C．Therelationshipbetweenyoungstersandtheirparents.D．Parents’roleinhelpingyoungstersprotecttheireyesight.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）阅读下面短文，从短文后各题所给的四个选项（A、B、C、D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。Formany,justtakingpartinasinglemarathonistheachievementofalifetime.ButforJulieWeiss,ithasbecomea1routine.Shehasrun12marathonsonceaweek—forthepastyearinmemoryofherdadwho2just35daysafterhewas3withpancreaticcancer(胰腺癌).WhenJulieWeisslostherfatherin2010,shewas4tofindtheresearchforpancreaticcancerissoshortoffund.“Itmademefeel5”shesaid,“IknewIhadtodosomething.”Sothismarathonqueen,6shecallsherself,didwhatshedidbest;shewentrunning.Havingcompleted25marathonsduringthe7twoyears,Julienowvowed(发誓)torun12marathonsin12weeksin8ofherfather.Afteraskingpeopleto9moneyforeachmarathon,she10awebsite,marathongoddess,com,tocollectmoneyforthePancreaticCancerActionNetwork(PANCAN),anonprofitorganization.Juliebeganherincredible11withamarathoninRomeandthenenteredaraceevery12insomecityacrossNorthAmerica.13leavingworkat5p.m.onFridayshewouldbereadytobeginthenextrace,beforeshe14hometoCaliforniaonSunday.Juliefinishedher1,2.4-milejourneyinMarch2013,15morethan$200,000intheprocessforPANCAN.Whilerunning,shestucktoastricttrainingschedule.“Mybody’sgettingusedtothis.I’mchangingmydiet,becomingmorehealthyandlearningtorunmore16”shesaid.Whenhermusclesbeganto17,shekepther18inmind.“Whenyoudowhatyoulove,forthoseyoulove,thatiswherethe19happen.Togetherwecanmakea(n)20,andpavethewayforahappy,healthy,cancerfreelife.”shesaid.1、A．weekly B．monthly C．daily D．yearly2、A．passedby B．passedaway C．diedoff D．diedout3、A．connected B．diagnosed C．treated D．dealt4、A．inspired B．exhausted C．interested D．shocked5、A．desirable B．helpless C．hopeful D．wishful6、A．while B．what C．as D．since7、A．previous B．precious C．present D．precise8、A．search B．need C．honor D．place9、A．pay B．donate C．make D．earn10、A．setup B．madeup C．heldup D．brokeup11、A．experiment B．stage C．road D．challenge12、A．day B．morning C．weekend D．weekday13、A．At B．By C．With D．On14、A．parted B．left C．headed D．missed15、A．raising B．earning C．spending D．wasting16、A．merrily B．efficiently C．specifically D．casually17、A．swell B．stress C．burn D．ache18、A．strength B．relief C．motivation D．interest19、A．miracles B．accidents C．stories D．events20、A．offer B．sacrifice C．promise D．difference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）WhenIwasauniversitystudent,I1．(attract)bytheChinese.SoIgotajobasateacherinWuhanthreeyearsago.2．(think)back,IrealizeitwasthestudentsI.metinthefirstyearandChineseuniversitylifeingeneral3．gavemethedeepestimpression.Duringmyschooldays,Iwouldrarelygiveupmysparetimetoanyactivity4．(connect)withstudy.Unlessexamswereapproaching,myweekendsweredevotedtohavingfunorperhapsapart-timejob.MyChinesestudents,5．theotherhand,seemedtospendtheirentirewakinghoursstudying.IunderstandthatcompetitioninChineseuniversitiesisextremelyfierce.Nonetheless,theirenergyandmotivationput6．(I)toshame.MyfirstyearinChinawasalsomyfirstyearasateacher.Itwasbothchallenging7．rewarding.OnethingIknowforcertainisthatmyyearinWuhanchangedmeforthe8．(good).Thankstothe9．(polite)andwarmthofChinesestudents,Iovercamemyfearofspeakinginpublicandbecamemoreself-confident.Most10．(important),Imetdozensofnicepeopleandmademanyexcellentfriends.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短文。短文中共有10处错误，每句中最多有两处。错误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(Λ),并在此符号下面写出该加的词。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。Itwasarainandcoldnight、Ifinishmyeveningclassesandwasabouttogobacktomyhouse、Igotintoataxiandtoldthedrivermydestination、Tomysurprise,thedrivermadeanapology,sayshedidn'tknowtheway、Whatcomeataxidriverdidn'tknowtheway?Iwasalittleofangry、Atthemoment,anoldcouplestoppedourcar、Theirdestinationwasthesameasme,soheletthemin、Thetwogreetedusbutthegrandpatoldthedrivertheway、FromtheirconversationIknewthedriverwasafarmerandhehasbeenataxidriverjustforthreedays、I'malsonewtoZhengzhou、SometimesImakedirectionmistakes,butthereisalwayssomeonecanhelpme、Itwascoldoutside,butIfeltrealwarm、第二节书面表达（满分25分）29．（25分）假设你叫李华，寒假即将到来，你在网上看到一家国际旅行社招聘兼职助理的广告想去应聘。请你从以下几个方面，用英语给该旅行社写一封100词左右的求职信。1.应聘原因；2.个人资质；3.期待回复。注意：1.可适当增加细节，以使行文连贯；2.信的开头已给出，但不计入总词数。参考词汇:助理assistantDearSir/Madam,____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Yourssincerely,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、D4、A5、B6、C7、D8、A9、C10、D11、B12、A13、B14、regularA．productionB．1anguageC．popularD．minute2．weightA．heightB．ceilingC．foreignD．neighbour3．specialA．musicalB．oceanC．medicineD．biscuit4．perfectA．electB．preventC．effectD．problem15、C16、B17、B18、D19、D20、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、D2、B3、C22、1、D2、A3、B4、C23、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）witheachotherand