2023届江苏省常州市前黄高三下学期第六次检测英语试卷含解析

2023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．—Tom,doyouenjoyyourpresentjob?—________.Ijustdoitforaliving.A．OfcourseB．NotreallyC．NotlikelyD．That’sallright2．Usuallydoctorsareunderstandably________aboutnewmedicinesbecauseoftheuncertaintyoftheireffects.A．considerateB．logicalC．optimisticD．cautious3．—Iwonderwhythethinnestplasticsbags,though________,arestillinusehere.—Well,it’snoeasyjobtosolvethisproblemeffectively.A．banning B．banned C．toban D．havingbanned4．SomewarnedthatthesteptheUSgovernmenthastakentocopewiththecurrentcrisisis________muchrisk.A．oneof B．theoneof C．theone D．thatone5．IamsorryIamverybusynow.IfItime,Iwouldcertainlygotothemovieswithyou.A．have B．hadC．havehad D．hadhad6．Wehavealreadydiscussedthisplan_____,sonextweshouldsparenoefforttocarryitout.A．atlength B．atrandom C．atease D．atbest7．—Excuseme,doyoumindifIopenthewindow?—Well,ifyou__________.Icanputonmoreclothes.A．can B．mayC．must D．shall8．I’mnotsureofthereasonforthedog’sillness,butit____byeatingtoomuch.A．mayhavebeencaused B．needhavebeencausedC．shouldhavebeencaused D．musthavebeencaused9．thekeytothecarwhenmybosscametowardsme.FinallyIcoulddrivehimhomeasusual.A．NeverhadIfound B．SeldomdidIfindC．HardlyhadIfound D．NosoonerdidIfind10．China’sChang’e4roboticprobeenteredlunarorbitonWednesday,________amajorstepinitsmissiontomakeasoftlandingonthemoon’sfarside.A．marking B．tomarkC．havingmarked D．marked11．Ifyouarefeelingsotired,perhapsalittlesleepwould____．A．act B．helpC．serve D．last12．Thebiggestproblemformostplants,which________justgetupandrunawaywhenthreatened,isthatanimalsliketoeatthem.A．shallnot B．can'tC．needn't D．mustn't13．Theuseofcomputershasmade______possibleformorepeopletoworkathome.A．it B．that C．which D．what14．Weallagreethatitisgoodtohelpthoseinneed,butwhen______comestogivingawayourmoney,thingsbecomestrange.A．that B．this C．it D．one15．______whathadhappened,theyknewIwouldstruggleandsimplywantedtohelpbecauseitwastherightthingtodo.A．Hearing B．Tohaveheard C．Havingheard D．Heard16．Theinnerstrengthofthegirlallowsher_____goingwhenshegetsintotrouble.A．keepB．keepingC．tokeepD．kept17．Theexplosioninthechemicalplant______avoidedhadthecountyauthorities,aimingtoomuchatshort-terminterests,performedtheirdutiesfromthebeginning.A．shouldbe B．mightbe C．musthavebeen D．couldhavebeen18．OwingtoTheChinesePoetryCompetition,publicationsonclassicalChineseliteratureare__________asignificantshareofstoragespaceatthebookstore.A．takingupB．dividingupC．breakingupD．puttingup19．Davewasa________.Becauseofhismisconductinclass,thewholeclasshadtostayafterschool.A．wetblanketB．leadinglightC．blacksheepD．darkhorse20．Beijing’snewinternationalairportintooperationin2019willserve72millionpassengersannually.A．beingputB．tobeputC．putD．toput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）Circlescanbefoundeverywhereinthenaturalworld,butwithnoaccuratewaytomeasurethemtheyareverymysteriousandmightneverbefullyunderstood.Whenyoutakethedistancearoundacircleanddivideitbythedistanceacrossacircle,youwillalwaysgetPi(∏).WhilePiisequaltoabout3.14whenrounded,itisinfinitelylong.Withthehelpofcomputers,mathematicianshavebeenabletocalculatePiouttooveratrilliondecimal(小数)places.ThismakesPipuzzling,eventothemostfamousmathematicians.PiDayiscelebratedgloballyonMarch14,sincethewaywewritethisdate,3/14,looksjustlikePiwhenrounded.In2009,U.S.CongressvotedtoofficiallymakeMarch14PiDay.Certainpartsoftheworld—placeswhereMarch14iswrittenas14/3—willinsteadcelebratePiApproximationDaywhichtakesplaceonJuly22ndbecauseoftheresultof22/7.Pihasappearedinmovies,comics,music,andmore.“Inmodernmovies,anytimethefilmmakerwantstocreateasenseofmystery,thesymbolPiisused,”saysBlatner.Peoplealsoloveworkingtomemorizethedigits(数位)ofPiandcompetingagainstotherstoseewhocanremembermost.TheGuinnessWorldRecordforrecitingthemostdigitsofPiisheldbyLuChaoofChina,whosuccessfullyrecitedPitonearly67,000decimalplaces.Aboveall,PiDayisabouthavingfunwiththenumber,accordingtoBlatner.PeoplewillcelebratePiDaybyeatingpieandthrowingpie,andwithfunPi-relatedgames.Princeton,NewJerseyholdsaseriesofPi-relatedfestivities.EventsthisyearincludeasurprisebirthdaypartyforAlbertEinsteinwhosebirthdayalsofallsonMarch14,anda“WalkaPiEvent”whereparticipantswillwalk3.14milestogether.Justlikethenumberitself,thepossibilitiesforPiDayaretrulyendless.1、WhatmakesPimysterious?A．Waystodivideacircle.B．Waystouseitwhenrounded.C．Inabilitytowriteitasanexpression.D．Itsplentifuldecimalplaces.2、WhyisPiDaycelebratedinsomeplacesonJuly22nd?A．Becauseitisvotedofficially.B．Becauseitwascorrectedoriginally.C．BecausethedivisionresultisapproximatelyequaltoPi.D．Becausethatdayiseasiertoremember.3、WhatisthegoalofusingPiinfilmsaccordingtoBlatner?A．Tomovemoreviewers.B．Tocallforviewers’attention.C．Tomakethefilmsmorefrightening.D．Toaddsomethingmysterioustothefilm.4、Whatcanwelearnfromthetext?A．LuChaoisthefirstChinesetorecitePi.B．ManystatesintheUSAcelebratePidayonJuly22nd.C．TherearemanydifferenteventstocelebratePiDayintheworld.D．ScientistswilltrytheirbesttofigureoutthedigitsofPithoroughly.22．（8分）Owlsareequippedwithhighlydevelopedstealthtechnology(隐形技术)thathelpsthemchargetowardsprey—ananimalhuntedandeatenbyanother—undetected,astudyhasshown.Owlshaveflightfeathersthatabsorbaerodynamicsoundandcontrolthevibrations(振动)thatoccurwhenabirdbeatsitswings.Theresultisperfectsilenceasitapproachesamouseorotherprey.Scientistsusedlasersandhigh-speedcamerastoanalyzeandcomparelong-earedowl,eagleandpigeonfeathersduringflight.Whiledifferinginsize,allthreebirdshaveasimilarwing-beatstyle.ProfessorJinkuiChuledtheresearch.Hesaid,“Manyowlshaveauniqueandfascinatingabilitytoflysosilentlythattheyareoutoftheirprey'shearingrange,duetotheirfeatherstructure.”Thisbehaviourhaslongbeenofinteresttoengineers,asweseektoapplytheowls'noise-reductionmechanisms(机制)tootherpurposesandsituationsthatbenefitsociety.Now,however,weknowtheowls'silentflightabilityisevenbetterthanwethought.Ofallbirdstheowlisthekingofacousticstealth.Itnotonlymanagestopreventaerodynamicnoisewhengliding,butalsomechanicalnoisecausedbyvibrationduringflying.Thisisremarkable,consideringthesuddenjumping,bendingandtwistingthewingsaresubjectedtowhenflappingandthenoisethatiscreatedbyotherbirds.Inthescientificworld,theprocessusedtoremovethismechanicalnoiseiscalled‘damping’,whichmeanstheremovalofmechanicalenergyfromavibratingsystemusuallybychangingitintoheatandallowingittoremainsteady.“Ourresearchshowedthelong-earedowlhassuperiordampingskill,meaningitcanremainamazinglystableandremovemechanicalnoisecausedbythemovementofitsfeathers—quiteanimpressiveachievementofengineering.99Headded,“Thisstudywillhopefullyprovidefurtherinsightintotheowls'silentflightmechanismandhelpengineersdevelopideasforspecialmaterialsorstructures,suchason-shorewindturbines,wheresimilarnoiseremovalcanbeapplied.”1、Whatcanbetrueaboutowlsaccordingtothetext?A．Theyareactiveduringtheday.B．Theyattractmuchattentionfromengineers.C．Theyhavesimilarwingstoeagles.D．Theybeatwingswithoutvibrations.2、Bysaying“theowlisthekingofacousticstealth”inParagraph6,JinkuiChumeansowls______.A．aregoodatcapturingpreyB．haveagoodsenseofhearingC．aregoodatjumpingandtwistingD．havesilentflightability3、Whatdoestheunderlinedword“it”inParagraph8referto?A．Mechanicalnoise.B．Thevibratingsystem.C．Mechanicalenergy.D．Theremovalofmechanicalenergy.23．（8分）Asmorepeopleoptforthesinglelife,adultfriendshipsalsogrowmoreimportantForpeopleinrelationships,havingareliablegroupisimportant,too-yourmatewillbemuchhappierifyou’respreadingyouranxietiesbeyondhisorhercarsandyouwillalsofeelbetter.Inarecentstudy,researchersmadesomefascinatingfindingsabouthow“whoweare”informsthefriendshipswehold.Thestudywasbasedonthemostpopularpersonalityconstructincontemporarypsychology,theBig5personalitytraits(特征);extraversion,orhowmuchyouloveattentionandinteractingwithpeople;neuroticism,orhoweasilyworriedyouarebythings;agreeableness,orhowwarmandkindyouare;conscientiousness,orhowcarefulyouareaboutlifersmanyduties;andopennesstoexperience,orhowmuchyou’reintodiscoveringnewthings,whetherthey’reideas,people,orplaces.Fortheirstudy,theresearchteamrecruited434students.Theytookapersonalityquestionnaireinthelab,thenratedhowsatisfiedtheywerewiththeirfriendsandtheirlifeoverall,andthenresearchersaskedthemtorecommendhalfadozenfriendstoratetheirpersonality.Gatheringtheseratingstogether,theresearchersfoundthatopennesstoexperiencedidn’thaveanythingtodowithfriendshipsatisfaction,atleastinthisstudy.Neuroticismwaslinkedtolowersatisfaction(probablybecauseemotionallyunstablepeoplemaybedramaticorhardtoplease,atleastinmypersonalexperience).Buthavinghighscoresinthethreeremainingsunnytraits-conscientiousness,extraversion,andagreeableness-predictedhigherfriendshipsatisfaction.However,it’saprettyintuitive(直觉的)result,sinceit’seasytobefriendswithsomeonewho’salwaysontime,alwayssayingthatyou’reright,andalwaysuptohangoutButifyoudon’texactlyidentifywithallthat*fearnot:Yourpersonalityissomuchmorethanyourtraits.1、Whatdoestheauthorthinkofthefriendship?A．Itishelpfultodatingandwork.B．Itcanrelieveyournegativeemotions.C．Ithasnothingtodowithpersonality.D．Itisba.sedonthe5popularpersonalitytraits.2、Whatdidtherecentstudyfind?A．Thebiggest5personalitytraits.B．Themethodsofinformingthefriendships.C．Thewaystoformthemostpopularpersonality.D．Therelationshipbetweenpersonalityandfriendships.3、Whatdoestheunderlinedword“neuroticism”inParagraph2mean?A．Determination.B．Nervousness.C．Hesitation.D．Optimism.4、Whatopiniondoestheauthorhold?A．It’shardtopleaseemotionallyunstablepeople.B．Apunctualpersoncansurelymakemorefriends.C．Friendsarcmoreimportantthanfamiliesforsinglepersons.D．Thefivetraitsarcequallydemandedingettinghigherfriendshipsatisfaction.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（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）Microsofthasdevelopedanewsmartphoneappthatinterpretseyesignalsandtranslatesthemintoletters,allowingpeoplewithmotorneuronediseasetocommunicatewithothersfromaphone.TheGazeSpeakappcombinesasmartphone’scamerawithartificialintelligencetorecognizeeyemovementsinrealtimeandconvertthemintoletters,wordsandsentences.ForpeoplesufferingfromALS（渐冻症）,alsoknownasmotorneuronedisease,eyemovementcanbetheonlywaytheyareabletocommunicate.“Currenteye-trackinginputsystemsforpeoplewithALSorothermotorimpairmentsareexpensive,notrobustundersunlight,andrequirefrequentre-calibrationandsubstantial,relativelyimmobilesetups,”saidXiaoyiZhang,aresearcheratMicrosoftwhodevelopedthetechnology.“Tomitigatethedrawbacks…wecreatedGazeSpeak,aneye-gesturecommunicationsystemthatrunsonasmartphone,andisdesignedtobelow-cost,robust,portableandeasytolearn.”Theappisusedbythelistenerbypointingtheirsmartphoneatthespeaker.Achartthatcanbestucktothebackofthesmartphoneisthenusedbythespeakertodeterminewhicheyemovementstomakeinordertocommunicate.Thestickershowsfourgridsofletters,whicheachcorrespondtoadifferenteyemovement.Bylookingup,down,leftorright,thespeakerselectswhichgridstheletterstheywantbelongto.Theartificialintelligencealgorithmisthenabletopredictthewordorsentencetheyaretryingtosay.Zhang’sresearch,Smartphone-BasedGazeGestureCommunicationforPeoplewithMotorDisabilities,issettobepresentedattheConferenceonHumanFactorsinComputingSystemsinMay.1、Whatshouldpeoplewithmotorneuronediseasedowhentheycommunicatewithotherpeople?A．Theyneedspeaktothesmartphoneloudly.B．Theyhavetopredictthesentencetheyaretryingtosay.C．Theyneedchooseagridonthebackofthesmartphonewitheyemovements.D．Theyshouldworkouttheartificialintelligencealgorithminthesmartphone.2、HowdoestheGazaSpeakappwork?A．TheGazaSpeakappcanhearwhatthespeakerssay.B．TheGazaSpeakappcanconveyspeakersmovementstothelisteners’smartphone.C．Thecamerainthephonecanrecordspeakers’gesturesandpredictwhattheywanttosay.D．Theartificialintelligentcamerainthephonecanrecognizeeyesignalsandtranslatethemintowordsandsentences.3、Whichofthefollowingstatementistrue?A．DazaSpeakisdesignedforblindpeople.B．GazaSpeakislow-cost,robust,portableandeasytolearn.C．Currenteye-trackinginputsystemsdon’tneedanyre-calibrationandsetups.D．SmartphoneswithGazaSpeakapphavebeenpopularamongpeoplewithMotorDiseases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）RecentlyImetaguynamedLeonardGilbertonatrip.Leonardisthekindofpeopleyoucouldpassonthestreetandnever1butheis,inmyview,averyspecialpersonwho2recognition.Leolivesina3ruralarea,sowhenhiswifehadcancerseveralyearsago,Leowasfacedwithafour-and-a-half-hourdrivetowhereshecouldbetreated.That4lotsofexpenseformeals,fuel,hotelsandsoon.Butintheendthecancertookhiswife5.EvidentlyLeowasvery6byhiswife’spassing,buthewasalsoveryangry,forherealizedotherpeoplewerefacingthesamesortsof7.Ratherthangivingmoneytocharities,whathedidwasstarttothrow8.EveryotherSaturdayevening,thereisapartyinLeo’sgarage.Neighbours,friendsandrelativescomeandbringsnacksanddrinks;manybring9,thereismusicanddancing,andatsomepointduringtheeveningLeo10afamilyhehasfoundwhoarehavingdifficulties11thecostofsupportingacancerpatientundergoing12farfromhome.Thenahoney-jarispassedaroundandthemoney13,everycentofit,goes14tothatfamily.Thepeopleatthepartyhaveagoodtime.Thefamily15thatsomeone,probablysomeonetheyhavenevermetknowswhattheyaregoingthroughand16enoughtohelp.Leo’s17tohelpthefamiliesofothercancerpatientswasbornoutofhisgriefbut,fromtheperspectiveofthosewhohavereceivedthemoney,itisanactoflove.Hispersonal18hasresultedinanactofkindnessthathonoursthe19ofthewifehehaslost.Wouldn’titbeniceifwehadmorepeopleintheworldlikeLeonardGilbert?I’mgladImetLeo.Hemakestheworlda20place.1、A．know B．notice C．forget D．love2、A．requires B．needs C．deserves D．avoids3、A．convenient B．peaceful C．remote D．nearby4、A．meant B．spent C．showed D．reduced5、A．otherwise B．instead C．somehow D．anyway6、A．stricken B．shocked C．pleased D．mourned7、A．happiness B．hardships C．cancers D．expenses8、A．coins B．honey C．medicine D．parties9、A．jars B．cards C．instruments D．flowers10、A．tellsabout B．arguesabout C．commentson D．chatsabout11、A．cutting B．meeting C．increasing D．calculating12、A．charities B．depression C．treatment D．support13、A．saved B．paid C．owed D．collected14、A．partly B．exactly C．properly D．directly15、A．understands B．pretends C．ignores D．confirms16、A．earns B．cares C．struggles D．plans17、A．demand B．motivation C．expectation D．consideration18、A．donation B．opinion C．loss D．belief19、A．cancer B．memory C．wish D．recovery20、A．better B．worse C．morepeaceful D．moreterrible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）Friendshipisvery1．(importance).Everyone2．(need)friendship.Inallourliveswecan’tlivewithoutfriendshipjustaswecan’tlivewithoutair3．water.Friendshipmakesusgetonwell4．oneanothertogoaheadunderdifferent5．(kind)ofdifficultiesinfrontofus.But6．(really)friendshipisnoteasytocomeby.Truefriendshipmustbesincereandbebasedon7．(understand)eachotherbutnotonbenefitsofeachother.Agoodfriendcanalwaysbeagoodteacherto8．(we).Byhisadvicewearepersuaded9．(go)therightway.Therefore,10．moregreatfriendswehave,thebetterwecanimproveourselves.第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）短文改错假定英语课上老师要求同桌之间交换修改短文，请你修改你同桌写的以下作文，文中共存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（^），并在其下而写出该加的词。删除:把多余的词用斜线(\)划掉。修改:在错的词下面画一横线，并在其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。DearSally,Doyourememberme?WewereusedtogotoAllendalesSchooltogether.YouwerethefirstpersonIgettoknowthere.Wesatnexteachotherinclass,butlatertheteachermademesitapartbecausewewere,alwayschattingsomuch.Wealwayswenttoyourhouseafterschoolandlistenedtomusicforhours.We’dgetalltheBeatlesrecordassoonastheycameout.Onceweateallthefoodinyourfridgeandyourmotherwasanger.IstillseePenny,andshe’sstillasmadlyasever.She’salwaystalkingabouthavingtheschoolreunion.Soifyou’reinteresting,dropmealine.Lookingforwardtohearfromyou.Youroldschoolmate,Alice第二节书面表达（满分25分）29．（25分）假定你是李华，你校交换生Peter喜欢打篮球。请给他写封邮件，约他下周五下午参加篮球比赛。内容要点如下：1.时间、地点；2.活动安排；3.询问意愿。注意：1.词数100左右：2.可以适当增加细节，以使行文连贯。DearPeter，___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________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、D3、B4、A5、B6、A7、C8、A9、C10、A11、B12、B13、A14、C15、C16、C17、D18、A19、C20、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、D2、C3、D4、C22、1、B2、D3、C23、1、B2、D3、B4、A24、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.Thejunkvarie