2024屆云南楚雄州南華縣民中高考沖刺英語模擬試題含解析

2024屆云南楚雄州南華縣民中高考沖刺英語模擬試題注意事項：1．答卷前，考生務(wù)必將自己的姓名、準(zhǔn)考證號填寫在答題卡上。2．回答選擇題時，選出每小題答案后，用鉛筆把答題卡上對應(yīng)題目的答案標(biāo)號涂黑，如需改動，用橡皮擦干凈后，再選涂其它答案標(biāo)號?；卮鸱沁x擇題時，將答案寫在答題卡上，寫在本試卷上無效。3．考試結(jié)束后，將本試卷和答題卡一并交回。第一部分（共20小題，每小題1.5分，滿分30分）1．Ascientist’sattempttoproducetheworld’sfirstgene-editedbabies_____areimmunetoHIVhassparkedcontroversyinacademiaandthepublic.A．a(chǎn)s B．whoC．whom D．whose2．——Whatwaswrong?Whydidn’tyougotothepicnicasscheduled?——I’msorry.I_________aseriously-injuredoldmantothehospital.A．woulddeliverB．deliveredC．haddeliveredD．wasdelivering3．—Whydidyoucomebytaxi?—MycarbrokedownlastweekandIstillitrepaired.A．didn’thave B．hadn’thadC．haven’thad D．won’thave4．____________thefiercecompetitioninjobseeking,manyuniversitygraduateshavenochoicebuttoreducetheirowndemandforthesalary.A．FacedB．FacingC．TofaceD．Havingfaced5．ThepredictionfromMayaworriesresidents_______December21,2012wouldbetheendoftheworld.A．if B．that C．whether D．which6．China'sBeidouNavigationSatelliteSystemhasstartedprovidingglobalservices,________tobecomecompletearound2020.A．beingscheduled B．scheduled C．toschedule D．scheduling7．Doyouknowthat______chairmanofthemeetinghasannouncedthatMrHodgehasbeenmade______managerofthisfactory?A．the,the B．/,the C．the,/ D．a(chǎn),a8．Heissuchanunselfishman.Youcannothelpbut________him.A．respectB．torespectC．neglectD．toneglect9．—Mum,littleRaybrokehistoysagain!—Itdoesn'tmatter.Yousee,accidents_____happen.A．shall B．should C．must D．will10．—Mum,wouldyoupleasebuymeanMP5player?—Ifyoucanhelpdosomehouseworkthewholevacation，you____haveoneasareward.A．must B．need C．would D．shall11．—Iwillbeavicepresidentinayearortwo.—Youcan’tbeserious!_______.A．Ican’tmakeitB．Ican’thelpitC．Iwon’ttellasoulD．Iwouldn’tbetonit12．Mostspendingthatresultsindebtislikeadrug:aquickhitofpleasurethat______,onlytodragyoudownforyearstocome.A．takesoff B．wearsoff C．setsoff D．showsoff13．Mysummercampisn’tgoodfun,butitisreallearningexperienceforme.A．a(chǎn);/ B．the;a C．/;a D．a(chǎn);the14．wegotherebytrainorbyshipmakesnodifference．Thetimeandthefeesarethesame． A．Which B．How C．Whether D．Why15．.Somepeoplesaymorebutdoless______othersdotheopposite.A．once B．when C．while D．a(chǎn)s16．Advertisingoftenfunctionsasanindicatorfor______societyconsiderstobesociallyacceptableanddesirableatthetime.A．what B．whetherC．how D．which17．Ipreferaschool______teachershavetoworkasateam,insteadoffightingagainsteachother.A．where B．that C．a(chǎn)s D．when18．_____areceptiontocelebratethe68thanniversaryofthefoundingofthePeople'sRepublicofChina，vicepremierLiuattachedimportancetomutuallybeneficialcooperationbetweenUSAandChina．A．Addressing B．AddressedC．Beingaddressed D．Toaddress19．Whyaresomebrandsmorepopularthanothers______theproductsareofsimilarquality?A．a(chǎn)sthough B．evenif C．sothat D．incase20．Touristsarerequiredto_________localcustomsandmindtheirmannerswhentravellingabroad.A．spot B．confirmC．observe D．spread第二部分閱讀理解（滿分40分）閱讀下列短文，從每題所給的A、B、C、D四個選項中，選出最佳選項。21．（6分）HomefromtheNavy,IstartedschoolatGreenvilleCollegeinmyhometownofIllinois.I’dbeenoutofhighschoolforfouryears,butmyhighschoolheadmaster,Mr.Gardner,invitedmetoaValentine’sdaydancepartyatschool.Thethoughtofseeingmyformerteacherswasexciting.SoIagreed.WhenFridaycame,Icleanedup,dressedupanddrovetothehighschoolgym.IchattedwithmyteachersandapproachedMr.Gardnertothankhimbeforeleaving.Justthen,thebandstartedplayingandayounggirlstooduptosing.OnelookatandIwascrazy—Ihadneverseensuchabeautifulgirl!IaskedMr.Gardnerwhoshewas,andheanswered,“That’sMarilynRiley,CutRiley’sdaughter.”Iwasshockedtosaytheleast.Theylivedjustaroundthecornerfromme.Iwalkedacrossthegymfloortointroducemyself,“Hi,I’mJackJoseph.”“Iknowwhoyouare,”washernot-too-friendlyresponse.“Wouldyouliketodance?”Iasked.“No!I’mworking,”sheshotback.“CanIcallyounextweekforamoviedate?”Iasked.“No,”washerresponse.ForthenextmonthIphoned,tryingtosetupadate.Shealwayshadthesameanswer:No.thenonerainyafternooninMarchasIwasdrivinghomeafterbasketballpractice,IsawMarilyn,walkingwithnoumbrella,noraincoat,nohat.Ipulledalongsideherandaskedifsheneededaride,halfexpectinghertosayno.instead,shesteppedovertheroadsideandsatdownontheseatnexttome.Itwasonlyafewblockstoherhouse,butafterpullingintoherdrivewaywetalkedfor45minutes.Itwasmagicfromthenon.1、WhydidJackdecidetoattendtheparty?A．ThepartywasholdtowelcomehimbackhomeB．MarilynwouldbeintroducedtohimatthepartyC．HecouldmeetsomeofhisformerteachersthereD．TheygatheredtheretocelebrateValentine’sDay2、Whatwastheauthor’sattitudetowardstheparty?A．CasualB．FormalC．PassiveD．worried3、Wecaninferfromthetextthat__________.A．JackonceservedinthearmyafterhighschoolB．ittookJack45minutestodriveMarilynhomeC．JackandMarilynwerefamiliarwitheachotherD．itwasMarilyn’scoldattitudethatinterestedJack4、Howwouldthestorymostprobablydevelopintheend?A．MarilynwouldfallinlovewithJackB．JackwouldmakegreatachievementsincollegeC．MarilynwouldbecomeafamoussingerD．JackwouldhavefrequentconflictswithMarilyn22．（8分）RichasaKingWilliam1,whoconqueredEnglandsome930yearsago,hadwealth,powerandanarmy.YetalthoughWilliamwasveryrichbythestandardofhistime,hehadnothinglikeaflushtoilet(抽水馬桶),papertowels,orridinglawnmower(除草機).Howdidhegetby?Historybooksarefilledwithwealthypeoplewhowerepoorcomparedtome.Ihavestormwindows,Croesusdidnot.EntirenationstrembledbeforeAlexandertheGreat,buthecouldn’tbuycatfood.CzarNicholaslackedanelectricsaw.GivenhowmuchbetteroffIamthansomanyfamousdeadpeople,you’dthinkI’dbecontent.Thetroubleisthat,likemostpeople,Icomparemywealthwiththatoflivingperson:neighbors,schoolclassmates,famousTVpeople.ThegreedIfeeltowardmyfriendHoward’snewkitchenisnotreducedbythefactthatnokingseverhadarefrigeratorwithglassdoors,Thereisreallynorisingorfallingstandardofliving.Overthecenturiespeoplesimplyfinddifferentthingstofeelsadabout.You’dthinkthatsimplynothavingdiseasewouldputusinagoodmood,butnowewantahotbathtoo.Ofcourse,onewaytoachievehappinesswouldbetorealizethatevenbytoday’sstandardsthethingsIownareprettynice.Myhouseissmallerthanthehousesofmanyinvestmentbankers,butevensoithasalotmoreroomsthanmywifeandIcankeepclean.Besides,topeoplelookingbackatourerafromacenturyortwointhefuture,thesebankers’fancycountertopsandmyawnwornFormicawillseemequallyshabby,Ican’tkeepupwithmyneighborsrightnow.Butjustwait.1、Whatdocstheunderlinedphrase“getby”inthefirstparagraphmean?A．Succeedasaking.B．Dealwithcomplains.C．Getsomeextramoney.D．Liveinasatisfactoryway.2、Howmanyhistoricalfiguresarementionedtocomparelivesinthepastandpresent?A．3. B．4.C．5. D．6.3、Accordingtothepassage,theauthorintendsto.A．tellustobecontentwithlifeB．warnustoliveinasimplewayC．leachustolearnlessonsfromlifeD．encourageuslostruggleforwealth4、What’stheauthor’sattitudetowardslife?A．Doubtful. B．Optimistic.C．Uncaring. D．Cautions.23．（8分）Theworldisfilledwithbeautifulwinterwonderlanddestinationsthatareworthyofavisit.Hereareafewtohelpyougetyourwintervacationresearchstarted.SaltLakeCity,UtahSaltLakeCity,Utahisaperfectspotforskiing.Apartfromskiing,youcanvisitTempleSquare,thecity’smostpopularsitefortourists.TheMormonChurchisopentovisitorsallyearround.Theyoftenhostfreefamily—friendlymovies,playsandmusicevents,makingitagreatplacetofindmoreinformationaboutotherhappeningsinSaltLakeCity.Portland,MaineNewEnglandisagreatvacationdestinationanytimeoftheyear.Thehotelpricesareoftenlowerduringthewintermonthsbecauseitisconsideredoff—seasonastouristsgenerallygatherhereduringthesummerandearlyfill.Soifyouarelookingforaplacetogetgoodvalueforyourwintervacationdollars,putPortland,Maineonyourlistofgo—tospots.Whistler,BritishColumbiaWhistler,BritishColumbiaislocatedabout60milesnorthofVancouver.ItisparticularlyfavoredforitsskiseasonthatstartsduringthethirdweekofNovemberandlaststhroughApril.Whistlerhasbeennamedonseveralinternational“bestof”lists.SoifyouwanttogoskiingandyouarereadytoexploreCanada’sCoastMountainRange,thenyoushouldlookintoWhistlervacationrentals（出租）.Planningyourwinterwonderlandgetawayiseasyifyouknowwheretolook.Youdon’thavefeellikeyouhavetogotoahot,overpriceddestinationduringthewintermonths.Plentyofsnowy,fun—filleddestinationswillwelcomeyouwarmly.1、Wherecanyougoifyouwanttoenjoylivemusicperformancewithyourfamily?A．Portland,Maine.B．TempleSquare.C．Whistler.D．MormonChurch.2、WhoisthemostlikelytogotoPortland,Maine?A．Peoplewholikeskiing.B．Peoplewhohaveflexibleschedules.C．Peoplewithtightbudgets.D．Peoplewithreligiousbeliefs.3、WhathasprobablymadeWhistlerwinitsinternationalreputation?A．Itssports—lovingresidents.B．Itslong—lastingskiseason.C．Itslow—carbonlifestyle.D．Itseasily—accessiblecoast.24．（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（簡報）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．a(chǎn)nythingtheflightstafftellyoutodoB．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）Imagineyou’restandinginlinetobuyasnackatastore.Youstepuptothecounterandthecashierscansyourfood.Next,youhavetopay.ButinsteadofscanningaQRCode(二維碼)withyoursmartphone,youjustholdoutyourhandsothecashiercanscanyourfingerprint.Or,acamerascansyourface,youreyesorevenyourear.Now,thistypeoftechnologymightnotbefaraway.Astechnologycompaniesmoveawayfromthetraditionalpassword,biometric(生物特征識別的)security,whichincludesfingerprint,faceandvoiceID,isbecomingincreasinglypopular.In2013,AppleintroducedtheiPhone1s,oneofthefirstsmartphoneswithafingerprintscanner.Sincethen,usingone'sfingerprinttounlockaphoneandmakemobilepaymentshasbecomeacommonplace,bringingconveniencetoourlives.Andsince2012,Samsunghasfeaturedeye-scanningtechnologyinitstopsmartphones,whileApple'snewiphoneXcanevenscanauser'sface.Butdespiteitspopularity,expertswarnthatbiometricsmightnotbeassecureasweimagine."Biometricsisideallygoodinpractice,notsomuch,"saidJohnMichener,abiometricsexpert.WhenintroducingthenewiPhone'sfaceIDfeature,PhilSchiller,Apple'sseniorvice-president,said."ThechancethatarandompersoninthepopulationcouldlookatyouriPhonesXandunlockitwiththeirfaceisaboutoneinamillion."Butit'salreadybeendone.InavideopostedonacommunitywebsiteReddit,twobrothersshowedhowtheywereeachabletounlockthesameiPhoneXusingtheirownface.Andtheyaren'teventwins."Wemayexpecttoomuchfrombiometrics,"AnilJain,acomputerscienceprofessoratMichiganStateUniversity,toldCBSNews."Nosecuritysystemsareperfect."Earlierlastyear,Jainfoundawaytotrickbiometricsecurity.Usingaprintedcopyofathumbprint,shewasabletounlockadeadperson'ssmartphoneforthepolice,accordingtoatechwebsiteSplinter."It'sgoodtoseebiometricsbeingusedmore,"JaintoldCBSNews,"becauseitaddsanotherfactorforsecurity.Butusingmultiplesecuritymeasuresisthebestdefense."1、Whichisthelatestidentificationtechnologyinasmartphoneaccordingtothepassage?A．Facescanning.B．Eyescanning.C．QRCodescanning.D．Fingerprintscanning.2、WhatisamajorproblemoftheiPhoneX'sfaceIDsystem?A．Ittakestoolongtounlockthephone.B．Itoftenfailstorecognizeitsowner'sface.C．Facedatacanbeusedforotherpurposes.D．Differentfacescanbeusedtounlockthesamephone.3、WhatisAnilJain'sopinionaboutbiometricsecurity?A．Itisassecureastraditionalmeasures.B．Itisperfectwithoutmuchimprovement.C．Ithascausedmuchtroubleforthepolice.D．Itshouldbeusedwithothersecuritymeasures.4、Whatdoestheauthorintendtotellusinthispassage?A．Thepopularityofbiometrics.B．Securityproblemsofbiometrics.C．Variousproblemswithbiometrics.D．Greatchangescausedbybiometrics.第三部分語言知識運用（共兩節(jié)）第一節(jié)（每小題1.5分，滿分30分）閱讀下面短文，從短文后各題所給的A、B、C和D四個選項中，選出可以填入空白處的最佳選項．26．（30分）Attheageofnine,Iwastakingswimminglessonsatapool.ThedayhadarrivedwhenIwastobetestedtoseeifIcould1toahigherlevelclass.Fifteenofuswereto2swimmingfromonesideofthepooltotheotherandback.Iwatchedasmy3,onebyone,triedandfailed.Thenitwasmyturnto4,Imean,myturntoattempttopassthetest.IwasabouthalfwaywhenIgot5Iimmediatelystoppedand6thesideofthepool,endingmytest.Ourinstructor,acollegestudent,wasstanding7me.“Whydidyoustop?”heyelled,inaless—than8voice.“Igotwaterinmynose,”I9.That’swhenthiscollegestudent10meoneoflife’sgreatlessons,11heprobablyneverrealizedthat.Bendingdown,heshouted,“So?”“So?”The12shockedme.Ithadjustseemed13tomethattheanswertopainwastoremovethethingcausingthe14.Mynine-year-oldbrainhadnotunderstoodthefactthatavaluable15isworthachieving,howeverdifficulttogetthere.Recognizingthat,Iwas16nothingwouldkeepmefromcompletingthetest.Infact,Ididitrather17onmynextattempt.Seeingme18thetest,almostalltheothersdidsoaswell.Lifeisajourney,andtheroadwon’t19beeasy.Wehavetofocusonthefinaldestination,notthe20alongtheroad.1、A．skipB．referC．a(chǎn)dvanceD．a(chǎn)dd2、A．taketurnsB．insistonC．takerisksD．putoff3、A．competitorsB．classmatesC．studentsD．instructors4、A．showB．leaveC．failD．observe5、A．injuredB．blamedC．trappedD．choked6、A．pushedB．pressedC．grabbedD．controlled7、A．a(chǎn)boveB．belowC．besideD．beyond8、A．surprisedB．sympatheticC．a(chǎn)nnoyedD．cold9、A．explainedB．reactedC．declinedD．urged10、A．deliveredB．owedC．taughtD．promised11、A．sothatB．a(chǎn)sifC．incaseD．evenif12、A．problemB．excuseC．questionD．voice13、A．logicalB．illegalC．ridiculousD．impossible14、A．disasterB．discomfortC．damageD．fear15、A．resultB．a(chǎn)dvantageC．goalD．task16、A．concernedB．sensitiveC．embarrassedD．sure17、A．slowlyB．easilyC．clumsilyD．eagerly18、A．a(chǎn)ttendB．takeC．giveD．pass19、A．a(chǎn)lwaysB．sometimesC．everD．seldom20、A．sightsB．barriersC．surprisesD．harvests第二節(jié)（每小題1.5分，滿分15分）閱讀下面材料，在空白處填入1個適當(dāng)?shù)膯卧~或括號內(nèi)單詞的正確形式。27．（15分）Generallyspeaking,whenyouhavereturnedhomefromaforeigncountry,you’llnoticeyourselfdoingthingsalittle1．(different).Maybeyou’llstartridingyourbiketothesupermarketratherthandrivingacar.You’llbegintodance2．a(chǎn)differentrhythm(節(jié)奏)becauseit’stheonlyway3．makessensetoyou.Onedayyourheartwillstartmissingthosefar-awaysights,soundsandsmellsthatyou4．(leave)behind---thehumidity(濕潤)ofarainforestafteradownpour,theheavenlysmelloffoodatthestreetmarketandtheorchestra(交響樂)ofmonkeys,birdsandotherwildthingsoutsideyourwindowatnight,5．sentyoutosleep.Lifehasforeverchanged,andthe6．(explain)issimple:you’veleftalittlepieceofyourheartbehindthatyou’llnevergetback.Yournewfoundsenseof7．(free)willhaveyousearchtheInternet8．thebestdealsonflightstofindthelastundiscoveredparadise(天堂)besides9．(challenge)theoldversionofyourselfwithnewinterests,pastimes,foodsandwaysofunderstandingtheworldaroundyou.It’snotamatterofwhetheryou’llstartanotheradventure,10．when.第四部分寫作（共兩節(jié)）第一節(jié)短文改錯（滿分10分）28．（10分）假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯誤，每句中最多有兩處。每處錯誤僅涉及一個單詞的增加、刪除或修改。增加：在缺詞處加一個漏字符號（∧），并在其下面寫出該加的詞。刪除：把多余的詞用斜線（\）劃掉。修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。注意：1、每處錯誤及其修改均僅限一詞；2、只允許修改10處，多者（從第11處起）不計分。WevoluntarilyparticipatedinanactivityorganizedbyourschoolinSaturday、WegottogetherattheGoodwillSquareandhandedoutleafletstopassers-by,tellthemthesignificanceofenvironmentalprotection、Theleafletssoonattracttheattentionofthepublic、Someofusalsodeliveredapublicspeechtotellpeoplesomeknowledgesabouthowtoprotecttheenvironment、Theywerealsotoldwheretotakeactioninaproperlyandefficientway、ThisactivitywasofferedusachancetocontributetooursocietybutIhavelearnedmuchfromit、Ithinksomeoneshouldbeconcernedaboutourenvironmentandtakeactivepartinimprovingit、13第二節(jié)書面表達(dá)（滿分25分）29．（25分）假如你叫李華。最近，你們班就“Whichisbetter,workingindividuallyorworkinginateam?”為主題進入了辯論，請根據(jù)下面提示給校陽光電視臺的編輯用英文寫一篇短文，客觀的介紹辯論情況。1.獨立完成：自行安排、自己解決問題；2.合作完成：一起討論、相互學(xué)習(xí)；3.我喜歡的方式和理由。注意：1.詞數(shù)：100左右2.開頭已寫好，不計入總數(shù)。DearEditor,Recently,wehavehadaheateddebateonwhichwayisbettertogetworkdone,workingindividuallyorworkinginateam.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

參考答案第一部分（共20小題，每小題1.5分，滿分30分）1、B2、D3、C4、B5、B6、B7、C8、A9、D10、D11、D12、B13、C14、C15、C16、A17、A18、A19、B20、C第二部分閱讀理解（滿分40分）閱讀下列短文，從每題所給的A、B、C、D四個選項中，選出最佳選項。21、1、C2、B3、A4、A22、1、D2、B3、A4、B23、1、D2、C3、B24、Spaceiswhereourfutureis—tripstotheMoon,Marsandbeyond.Mostpeoplewouldthinkthatasidefromcomets(彗星)andstars,thereislittleelseoutthere.But,sinceourspacejourneystartedwehaveleftsomuchtrash（垃圾）therethatscientistsarenowconcernedthatifwedon'tcleanitup,wemayallbeinmortal（致命的）danger.Thefirstpieceofspacejunkwascreatedin1964,whentheAmericansatelliteVanguardIstoppedoperatingandlostitsconnectionwiththegroundcenter.However,sinceitkeptorbitingaroundtheEarthwithoutanyconsequences,scientistsbecameincreasinglycomfortableabandoning（拋棄）thingsthatnolongerservedanyusefulpurposeinspace.Itisestimated（估計）thattherearenowover500,000piecesofman-madetrashorbitingtheEarthatspeedsofupto17,500milesperhour.Thejunkvariesfromtinypiecesofpaintchippedoffrocketstocameras,hugefueltanks,andevenodditemslikethemillion-dollartoolkitthatastronautHeidemarieStefanyshynPiperlostduringaspacewalk.Themajorproblemwiththespacetrashisthatitmayhitworkingsatellitesanddamagetravelingspacecraft(飛船).Moreover,piecesofjunkmaycollide（碰撞）witheachotherandbreakintopieceswhichfallbacktotheEarth.Toavoidthis,scientistshaveinventedseveralwaysforclearingthesky.Groundstationshavebeenbuilt