2022年寧夏銀川市高三第一次模擬考試英語試卷含答案

2021-2022高考英語模擬試卷注意事項(xiàng):1．答題前，考生先將自己的姓名、準(zhǔn)考證號(hào)碼填寫清楚，將條形碼準(zhǔn)確粘貼在條形碼區(qū)域內(nèi)。2．答題時(shí)請按要求用筆。3．請按照題號(hào)順序在答題卡各題目的答題區(qū)域內(nèi)作答，超出答題區(qū)域書寫的答案無效；在草稿紙、試卷上答題無效。4．作圖可先使用鉛筆畫出，確定后必須用黑色字跡的簽字筆描黑。5．保持卡面清潔，不要折暴、不要弄破、弄皺，不準(zhǔn)使用涂改液、修正帶、刮紙刀。第一部分（共20小題，每小題1.5分，滿分30分）1．Herdoctorindicatedthatevenaddinga(n)_____amountofdailyexercisewoulddramaticallyimproveherhealth.A．modest B．equalC．exact D．considerable2．Thereisnodoubtthatclimateallovertheworld______greatlyinrecentyears.A．hadchanged B．ischangingC．changed D．hasbeenchanging3．Ellenisafantasticdancer.IwishI________aswellasher.A．dance B．willdanceC．haddanced D．danced4．MichelleObamawearsclothesthatanyonecanbuyinamalland________shemayhavealargereffectonconsumersthanordinarymodels.A．furthermore B．otherwise C．nevertheless D．therefore5．—Therearen’tanytoysinoursuitcase．Wherehaveyouputthem?—Oh,no．Thatoldladysittingnexttous______havetakenoursbymistake.A．must B．could C．should D．would6．Peopleallthinkitstrangethattheboyshouldtellwhat’swrittenonthepaperinanotherroomwithoutlookingatit.Itreally________explanation.A．prevents B．challenges C．interrupts D．confuses7．Thereaslightdecreaseinhisweightbutheeatstoomuch.A．was B．couldhavebeenC．hadbeen D．couldbe8．Littleaboutherownsafety,thoughshewasingreatdangerherself.A．didRosecare B．RosedidcareC．Rosedoescare D．doesRosecare9．AlthoughshedidnotknowBostonwell,shemadeherway________totheHomeCircleBuilding.A．easyenough B．enougheasyC．easilyenough D．enougheasily10．ThefarmersaidthePLAmencametorescuetimelywhenthey_____inthesnowstorm.A．weretrappingB．werebeingtrappedC．a(chǎn)retrappingD．a(chǎn)rebeingtrapped11．—You’vemadegreatprogressinyourEnglishstudy,haven’tyou?—Yes,butmuch.A．remainstodo B．isremainedtodoC．remainstobedone D．isremainedtobedone12．—Accordingtomymother,itisagoodideatohavesomechickensoupwhenyouhaveacold．—_____,scientistsagreewithher．A．SoonerorlaterB．OnceinawhileC．BelieveitornotD．Tobeexact13．—Areyoufreenow?Ihavesomethingimportanttotellyou.—OK,________youmakeitshort.Iwillhavetofinishthisreportbeforenoon.A．nowthatB．a(chǎn)ssoonasC．everytimeD．a(chǎn)slongas14．Asurveyoftheopinionsofexperts_________thatthreehoursofoutdoorexerciseaweek________goodforone’shealth.A．show;are B．shows;isC．show;is D．shows;are15．IliketheseEnglishsongsandthey________manytimesontheradio.A．taught B．havetaughtC．a(chǎn)retaught D．havebeentaught16．Timeispressing．Youcannotstartyourtask_____soon．A．too B．very C．so D．a(chǎn)s17．Thereareno______proposalstoreducetheroadaccidents.Wearestillseekinginspiration.A．contradictoryB．concreteC．confidentialD．controversial18．Ourcompanyisseekingforamanager,especially________withcreativityandimagination.A．theone B．eachC．one D．that19．Everyschoolintothecompetitionwillhaveachancetowin$2,000______ofcomputingequipment.A．price B．worth C．value D．cost20．Yourdonationgreatlyappreciatedandthemoneywillbeusedtohelpthestudentsfrompoorfamilies.A．hasbeenB．isC．wasD．hadbeen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(gè)選項(xiàng)中，選出最佳選項(xiàng)。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（簡報(bào)）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．Howtotakeaplane22．（8分）Anewstudyhasshownhowcomputersandrobotspoweredbyartificialintelligencecanreadhumaneyemovementsto"read"humanpersonalities.Theeyes,theysay,arethewindowstothesoul.Andifthatistrue,computersandrobotspoweredbysophisticated（復(fù)雜的）artificialintelligencealgorithms（算法）maysoonhavetheabilitytopeerintoyoursoul.Thatistheresultofanewstudyontheconnectionbetweeneyemovementsandpersonality,conductedbyneuroscienceresearchersbasedattheUniversityofSouthAustraliaandPublishedinthescientificJournalFrontiersinNeuroscience."Eyemovementsduringaneverydaytaskpredictaspectsofourpersonality,"wrotetheresearchers,ledbyUniversityofSouthAustralianeuroscientistTobiasLoetscher,whoseteamfollows42studysubjectsaroundtheuniversitycampusrecordingtheireyemovements,thendeterminestheirpersonalitytraits（特點(diǎn)）with"well-establishedquestionnaires"fordeterminingpersonalitytype,accordingtoasummaryofthestudypublishedbythesiteScienceDaily.TheresearchersfedthedataintotheirAlalgorithmsandfoundthatcomputersrunningthealgorithmswereabletorecordhumaneyemovementsandimmediatelydetermineaperson'smajorpersonalitytraits,suchas"neuroticism,extraversion（外向），agreeableness,conscientiousness,aswellasperceptual（感知的）curiosity",thescientistswrote."Thenewfindingscouldimprovethewayhumanbeingsinteractwiththeircomputersandotherhigh-techdevices,evenrobots,allowingformorenaturalandrealisticsocialinteractionswithmachines,"Loetschersaid."Peoplearealwayslookingforimproved,personalizedservices.Today'srobotsandcomputersarenotsociallyawaresotheycannotadapttonon-verbalinformation,"LoetschersaidinastatementquotedbyIndianExpress.Thisresearchprovidesopportunitiestodeveloprobotsandcomputerssothattheycanbecomemorenatural,andbetteratinterpretinghumansocialsignals."Thestudyrevealedpreviouslyundiscoveredrelationsbetweenspecificpersonalitycharacteristicsandspecificeyemovementtendencies,accordingtoasummaryinBritain'sDailyMailnewspaper.1、Whatdotheunderlinedwords"peerinto"inParagraph2probablymean?A．understand B．stareatC．searchfor D．concernabout2、Howdidtheresearchersconducttheresearch?A．Itwascarriedoutinalab.B．42subjects'eyemovementswererecorded.C．Thestudents'dailymovementsweretracked.D．Itssubjects'personalitiesweredeterminedbycomputer.3、AccordingtoTobiasLoetscher,whatcanweknow?A．Robotsandcomputersaresociallyconscious.B．Peoplecarelessaboutimproved,personalizedservices.C．Today'srobotsandcomputerscanaccustomtonon-verbalinformation.D．Thediscoverywillimprovetheinteractionbetweenhumanbeingsandmachines.4、Whatcanbeasuitabletitleforthetext?A．HumanPersonalityTraitsB．WhatHumanEyeMovementsAreC．TellPersonalitiesbyEyeMovements.D．HowHumansandMachinesInteract23．（8分）TinyCountriesYouNeverknewExistedSaoTomeandprincipeSaoTomeandPrincipeoffAfrica'swestcoastisonly372squaremiles,butithasImpressive,undamagednature,richinbiodiversespecies.Theamazingneedle-likevolcanicpeakPicoCaoGranderises1,000feetintotheair.Theislandsarehometoonlyaround200,000peopletoday.SanMarinoOnly23squaremileswithapopulationofjust34,000,thelittle-knowncountryofSanMarino,surroundedbyItaly,istheworld'sfifthsmallestcountry.WiththeUNESCOWorldHeritageSiteofMountTitano,thecountryissaidtobetheoldestrepublicintheworld.DominicaDominicacoversonly290squaremiles,withsomeofthebestdivingintheCaribbean,includingtheUNESCOWorldHeritageSiteofvolcanicMormeTroisPitonsNationalPark.InDominica,you'llseerainforests,waterfalls,andcoastalviews.TheislandisalsohometotheonlyremainingpopulationoftheKalinago,whoarepartoftheisland's74,900inhabitants.KiribatiThisPacificislandcountry33coralislandsis313square-miles,butit'stheonlycountryintheworldtofallintoallfourhemispheres(半球).Thecountry's109,000residentsliveinonly21oftheislandsseethistropicalparadisebeforeitisnolonger--risingseasarethreateningtoswallowthecountrywhole.1、Whichcountryhasthesmallestpopulation?A．SaoTomeandPrincipe.B．SanMarin.C．Dominica.D．Kiribati.2、WhatcanoneseeinbothSanMarinoandDominica?A．Volcanoes.B．Worldheritagesites.C．ViewsoftheCaribbean.D．Waterfalls.3、WhichistrueofKiribati?A．Itisrichinbiodiversespecies.B．ItissurroundedbyItaly.C．ItishometotheKalinago.D．Itisdisappearing.24．（8分）TheonethingeveryonelovestohatewhenitcomestotheInternet—theuserpassword—isunderfirenow.Actually,it’sbeenunderfireforalongtime.Inanidealworld,peoplewouldusealongstringcomposedofcompletelyrandomcharacters,numbersandsymbols.Furthermore,auniquepasswordwouldbeusedforeverysiteorapplicationtheuseruses.Unfortunately,themorecomplexthepasswordsbecome,themorepeoplearelikelytoforgetthem.Thelongerthepasswordsare,themoreeasilyforgottentheyare.Therefore,peopleusethesamepasswordforeveryserviceorapplication.Itisano-noandextremelydefeatsthepurposeofapassword.Googleistryingtokillofftheuserpassword,atleastonAndroiddevicesbyintroducingtheTrustAPI,whichdoeswhatsimplepasswordscannot.Itgivesdevelopersaframeworkforsecuringtheirapplicationsusinganumberofsecuritysystemandmetrics(衡量標(biāo)準(zhǔn))onthedevice.ATrustScorewillbegeneratedbasedonthemetricsthedevicegathersandwillallowordenyaccesstoapplicationsbasedonwhetherornotyourTrustScoreishighenough.TheTrustScorewillbegeneratedbasedonmetricslikeyourdevicelocation,facescanningandfingerprint,andthethingslikeyourtypingspeedorthewayyouspeak.Takenoneatatime,thesemetricsarenotsecure.Buttakentogether,thesemetricswillhelpdefinethereal“you”.Passwordshavebeenaroundsincethedawnofcomputingandalthoughthesecurityofsystemshasbeenimproved,theyhaven9tdonemuchtoimprovetheusabilityofsystems.Googleappearstohavethebestofbothworlds—ahighlysecuresystemthatenduserswon^evennotice.Maybethatnever-endingconflictbetweensecurityandconveniencewillbeabletotakeabreakoncethetrustsystemcomesout.1、Whyarepasswordsseverelycriticized?A．Theycan’tprotectusersagainstallthreats.B．Resettingthemneedsmuchtimeandeffort.C．Theyaren’tsuitablefortheforgetfulpeople.D．Ifsdifficulttogetbothconvenienceandsafety.2、HowcantheTrustAPIbecomesecureenough?A．Bycombiningvariousmetricstogether.B．Bylockingusers’privateinformation.C．ByprovidinguserswithTrustScores.D．Bychangingusers’identityrecognitionways.3、Whatcanweknowaboutthetrustsystem?A．Ithasn’tbeenprovedtobeeffective.B．Itiswidelyusedinmanyfields.C．Itmaymakepasswordsoutofuse.D．Itneedstobeimprovedfromnowon.4、Whichofthefollowingcanbethebesttitleforthetext?A．Aren’tPasswordsVeryComplex?B．IstheTrustAPIJustPieintheSky?C．WhatCantheTrustAPIBringUsers?D．WillPasswordsSoonBeaThingofthePast?25．（10分）WelcometoAdventureland!EveryonelovesAdventureland!TheParksandExhibitionswerebuiltforyoutoexplore（探索）,enjoy,andadmiretheirwonders.Everyvisitwillbeanunforgettableexperience.Youwillgoawayenriched,longingtocomeback.Whatareyougoingtodothistime?TheTravelPavilionExploreplacesyouhaveneverbeentobefore,andexperiencedifferentwaysoflife.VisittheAmazonjungle（叢林）village,theTurkishmarket,theTaifloatingmarket,theBerbermountainhouseandothers.Talktothepeopletherewhowilltellyouabouttheirlives,andthingstheymake.Youcantrymakingacarpet,makingnets,fishing…TheFutureTowerThisexhibitionshowshowprogresswilltouchourlives.Itallowsustolookintothefutureandexplorethecitiesofthenextcenturyandthewaywe’llbelivingthen.Spendsometimeinourspacestationandclimbintooursimulator（模擬裝置）fortheJourneytoMars!TheNatureParkThisisnotreallyoneparkbutseveral.IntheSafariParkyoucandriveamongAfricananimalsinoneofourRangeCruisers:seelions,giraffes,elephantsinthewild.MoveontotheOceanParktowatchthedolphinsandwhales.AndthenthereisstilltheAviarytosee…ThePyramidThisisthecenterofAdventureland.Runoutoffilm,needsomepostcardsandstamps?Forallthesethingsandmanymore,visitourundergroundshoppingcenter.Comehereforinformationandideastoo.1、TheTravelPavilionisbuilttohelpvisitors.A．realizetheimportanceoftravellingB．learnsomethingaboutdifferentplacesintheworldC．learnhowtomakethingssuchasfishingnetsD．becomefamiliarwithmountaincountries2、Ifyouareinterestedinknowingaboutwhatpeople’slifewillbe,youmayvisit.A．theTravelPavilion B．thePyramidC．theSafariPark D．theFutureTower3、Ifyouwanttogetatoyliontotakehome,wherewillyoumostlikelygo?A．ThePyramid. B．TheNaturePark.C．TheFutureTower. D．TheTravelParvilion.第三部分語言知識(shí)運(yùn)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(gè)選項(xiàng)中，選出可以填入空白處的最佳選項(xiàng)．26．（30分）MymostrewardingexperiencethroughoutthepasttwoyearswasvolunteeringattheswimmingcompetitionforSpecialOlympicswhereadisabledfriendofmycommunitytookpart.Thishadspecial1formebecauseexperiencingithelpedimprovemyleadershipskills,developmycharacter,andsupportmycommunity.Firstly,my2skillsdevelopedwhenIindependentlydirectedeachswimmerwhereto3attheplatformand4eachcompetitorwhentheyneededtoswim.Ihadtomakesurethattheswimmerswere5andreadytoperform.Thiskeptmeonmyfeetatalltimesand6ofeachevent’stimeandlocation.Ilearnedeachswimmer’sname,7manyofthemswaminmorethanoneevent.Secondly,my8wasgreatlyinfluenced.WhenIsawtheswimmersgettheirawardsforwinningeachswimmingevent,Iwasdeeplymoved.Iwas9thatmostswimmerscouldswimbetterthanI.Their10attitudesastonishedme,whethertheywonorlost.Thisalsoenlargedmyview,offeringmetheopportunityto11peopleIwouldnormallynotruninto.Iwentoutofmy12zoneanddidwhateverwasneededtobedone,evenifitwassometimesdifficulttome.Itwasespecially13whenIsawtheglowingfacesofthecompetitors.Lastly,Iwasof14tomycommunitybylendingahandtothisorganization.Tobeapartofitgavemeachancetoimprovemycommunityandbecome15withthepeoplelivinginthisarea.AsWinstonChurchilloncesaid,“Wemakealivingbywhatwedo,butwemakea(n)16bywhatwegive.”Theimportanceof17shouldbestressedthroughoutyourlife.18,throughthemanyopportunitiesmycommunityhasofferedIwasprivilegedtobe19inthisexcitingandimportanteventinthesecompetitors’lives.Ihopetobea(n)20againatthiseventinyearstocome.1、A．purposeB．a(chǎn)ttentionC．meaningD．regulation2、A．learningB．a(chǎn)ctingC．exerciseD．leadership3、A．pileupB．lineupC．putupD．fillup4、A．informedB．a(chǎn)wardedC．taughtD．compared5、A．positionedB．preservedC．presentedD．predicted6、A．fullB．ignorantC．a(chǎn)wareD．convinced7、A．becauseB．ifC．soD．though8、A．techniqueB．imaginationC．figureD．character9、A．remindedB．impressedC．blamedD．concerned10、A．variousB．controversialC．changeableD．positive11、A．educateB．gatherC．meetD．recommend12、A．safetyB．comfortC．timeD．development13、A．rewardingB．outstandingC．interestingD．relaxing14、A．wisdomB．courageC．serviceD．encouragement15、A．crowdedB．combinedC．suppliedD．a(chǎn)cquainted16、A．exceptionB．wayC．lifeD．a(chǎn)nalysis17、A．evaluatingB．volunteeringC．travelingD．a(chǎn)llocating18、A．StrangelyB．GenerallyC．SpeciallyD．Fortunately19、A．involvedB．committedC．devotedD．caught20、A．trainerB．a(chǎn)ssistantC．judgeD．a(chǎn)nnouncer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(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。27．（15分）ThebestfriendshiptobedescribedinChineseliteratureis1．(probable)theonebetweenYuBoyaandZhongZiqi.Yuwasafamousmaster(大師)ofmusic2．playedtheqinwell.Once,hetookaboattriptothestateofChu.Inspiredbythebeautifulviewalongtheway,Yutookouthisqinand3．(begin)toplay.Afterawhile,henoticedawoodsman(樵夫)4．(enjoy)hismusicquietly.ThemanwasZhongZiqi.WhenYuplayedmusicthatdescribedhighmountains,Zhongsaid:“Howwonderfulitis!IseemtoseeTaishanMountain.”Andwhenheplayedmusicthatdescribedflowingwater,Zhongsaid:“Howwonderfulitis!Iseemtoseetherushingriver.”Yuwassurprisedbythewoodsman’s5．(word)becausethemancouldreallyunderstand6．（he）music.WhenZhongdiedthefollowingyear,Yuwas7．upsetthathetookouthisqintoplaythemusicofthe“highmountainsandflowingwater”onelasttimeforZhong.Whenhewasdone,hebrokehisqin8．purposesohecouldneverplayitagain.Now,9．phrase“highmountainsandflowingwater”10．(use)tostandforthetruefriendship.第四部分寫作（共兩節(jié)）第一節(jié)短文改錯(cuò)（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處錯(cuò)誤，每句中最多有兩處。錯(cuò)誤涉及一個(gè)單詞的增加、刪除或修改。增加：在缺詞處加一個(gè)漏詞符號(hào)(/\)，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(cuò)的詞下畫一橫線，并在該詞下面寫出修改后的詞。注意：1、每處錯(cuò)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(jì)分。Iamgladtohearofyouagain、Youwanttoknowthateverythingisgoinginourschool、Inshortly,allisimproving、Inthepast,teachershadalwayskeptonexplainingthepointsinclass、Ourstudentsjustlistenedandtooknote、Butnowweoftendiscussandtrytosolvetheproblemsraisingbytheteachersorourselves、Beforeclass,weenjoydifferentkindsofactivitiesinsteadofdoingendlesshomework、Forexample,wecanreadwhatweareinterestedin、WecangotothelibraryorsurfInternetforvariouskindsofinformation、Wearenowmastersofstudy,butwearehappy、第二節(jié)書面表達(dá)（滿分25分）29．（25分）假定你是李華，今年10月你市將舉辦國際馬拉松賽（InternationalMarathon），目前正在招募志愿者。請用英語寫封申請信，內(nèi)容包括：1.寫信目的；2.個(gè)人優(yōu)勢；3.希望獲準(zhǔn)。注意：1.詞數(shù)100左右；2.可以適當(dāng)增加細(xì)節(jié)，以使行文連貫；3.開頭語和結(jié)尾語已為你寫好。___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________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參考答案第一部分（共20小題，每小題1.5分，滿分30分）1、A2、D3、D4、D5、A6、B7、D8、A9、C10、B11、C12、C13、D14、B15、D16、A17、B18、C19、B20、B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(gè)選項(xiàng)中，選出最佳選項(xiàng)。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（拋棄）thingsthatnolongerservedanyusefulpurposeinspace.Itisestimated（估計(jì)）thattherearenowover500,000piecesofman-madetrashorbitingtheEarthatspeedsofupto17,500milesperhour.Thejunkvariesfromtinypiecesofpaintchippedoffrocketstocameras,hugefueltanks,andevenodditemslikethemillion-dollartoolkitthatastronautHeidemarieStefanyshynPiperlostduringaspacewalk.Themajorproblemwiththespac