2025届河北省教考联盟高三一诊考试英语试卷含解析

2025届河北省教考联盟高三一诊考试英语试卷注意事项：1．答卷前，考生务必将自己的姓名、准考证号、考场号和座位号填写在试题卷和答题卡上。用2B铅笔将试卷类型（B）填涂在答题卡相应位置上。将条形码粘贴在答题卡右上角"条形码粘贴处"。2．作答选择题时，选出每小题答案后，用2B铅笔把答题卡上对应题目选项的答案信息点涂黑；如需改动，用橡皮擦干净后，再选涂其他答案。答案不能答在试题卷上。3．非选择题必须用黑色字迹的钢笔或签字笔作答，答案必须写在答题卡各题目指定区域内相应位置上；如需改动，先划掉原来的答案，然后再写上新答案；不准使用铅笔和涂改液。不按以上要求作答无效。4．考生必须保证答题卡的整洁。考试结束后，请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．Sheisquite________toofficework.Youhadbetterofferhersomesuggestionswhennecessary.A．familiar B．similarC．fresh D．sensitive2．JamesSmithandhisgirlfriendwenttoChenyiSquaretocelebratetheNewYear,never_________.A．returned B．toreturnC．returning D．havingreturned3．FortheChinesedream______atanearlierdate,wemustacceleratethepaceofreformandopeningup.A．beingrealized B．torealizeC．realizing D．toberealized4．________someleadersandscientistshavepraisedChina’sachievementinspacetechnology,othersregardChina’sprogressasathreat.A．Unless B．OnceC．Eventhough D．Nowthat5．______hewas12,Einsteinhadlearnedadvancedmathematicsbyhimself.A．ThefirsttimeB．AtthetimeC．BythetimeD．Duringthetime6．Topgraduatesfromuniversitiesare________bymajorcompanies.A．chased B．registeredC．offered D．compromised7．Ilikesuchhouseswithbeautifulgardensinfront,butIdon’thaveenoughmoneytobuy.A．it B．one C．that D．this8．IamsorryIamverybusynow.IfItime,Iwouldcertainlygotothemovieswithyou.A．have B．hadC．havehad D．hadhad9．Bythesideoftheteachingbuildingofourschool_____,whichwascompletedin2009. A．therestandingthelibrary B．doesthelibrarystand C．thelibrarystands D．standsthelibrary10．Aquickreviewofsuccessesandfailuresattheendofyearwillhelp________youyearahead.A．sharpen B．switchC．stretch D．shape11．IfJoe’swifewon’tgototheparty,________.A．hewilleither B．neitherwillheC．heneitherwill D．eitherhewill12．Ifit_____earlier,theprintingmachinewouldnothavebrokendown．A．hasbeenrepaired B．isrepairedC．hadbeenrepaired D．wasrepaired13．Uptillnow,therehasbeennoscientificevidenceabout________causedthedeathofdinosaurs.A．whatisitthat B．whatitwasthat C．itwaswhat D．whatisit14．WhileworkinginKunming,hecheckedtheweathereachmorningformonths________herealizeditwouldbethesameeveryday.A．whenB．afterC．beforeD．since15．Takingdrugshasbecomepartofeverysport_________athletesseektoachievebeyondtheirnaturallimits.A．which B．that C．who D．where16．Bob’slecturescoveredafairlywiderangeandIcan’tsumupwhathesaysinafewsentences.A．covered B．conveyed C．considered D．commanded17．—______yousinganddanceatthislatehourofthenight?—Sorry,Iwillstoprightnow.A．May B．ShallC．Will D．Must18．Ifit________forhergreathelpthen,IwouldnotstudyEnglishsowellnow.A．hasn’tbeen B．wasn’tC．hadn’tbeen D．isn’t19．Don’trefertothedictionaryeverytimeyoucomeacrossanewwordassometimesitsmeaningmaybe_______clearlyinagivencontext.A．pickedout B．ruledout C．broughtout D．takenout20．Membershipofthisclubisopentothosewhoareitsaim.A．insalutetoB．inhonourofC．inlinewithD．insympathywith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）Dreamingofsummerpicnicsfilledwithfamilyandfun?We’vecomeupwith4ofthetoppicnicareasacrosstheUS.CumberlandIslands,GeorgiaJustafewhourssouthofSavannah,thisnationalseashoreisapicnicparadise.It’sanunspoiledplaceintheDeepSouthwithover50milesofhikingtrails(小径).CoveredinSpanishmoss,thetrailsarelinedwithtreesandsinceit’sstillaruralarea,thestarslineupforaspectacularshowatnightandcreatetheperfecteveningstarlitpicnicopportunity.GrantPark,ChicagoIfyouarelookingfordeliciousfoodinChicago,goforatasteofa20-day,lake-front,foodiefestivalthathappensinOctobereachyear.Grabaspotnearthefountaintoenjoyyourpicnic,appreciatethecitysceneryandlakeviewsandrelaxwithfamilyandfriends.IfyouarethereonJuly4th,besuretoplanthedaytoincludethefireworksdisplayattheNavyPier.CranberryIslands,MaineHere,you’llenjoynaturalpicnicswithislandviews.Theislandsareadelightfulgroupofislandsabout20minutesoffshorefromAcadiaNationalPark.Youcanvisittheislandsbyprivateboatorferry(渡船)service.Bringapicnicbasketalongfortherideasit’saromanticpicnicareatotakeyourspecialsomeoneorgoforafamilyoutingtovisittheislands.BigSur,CaliforniaThePointLobosStateReserveisasmallgem.Besidesthecoastalwildlifetherearerareplantcommunities,anduniquegeologicalformations.It’sgoodtohaveapicnicthere.Werecommendbringingatelescope,becausemuchofthewildlifecanbeseenonlyatadistance.1、WhatareCumberlandIslandslike?A．TheyarejustnexttoSavannah.B．Theyhaven’tlosttheirnaturalness.C．TheyarealmostcoveredinSpanishmoss.D．Theyhaveaspectacularshoweverynight.2、Wherecanyouenjoyobservingwildlifewithatelescope?A．AttheNavyPier. B．IntheDeepSouth.C．AtAcadiaNationalPark. D．AtthePointLobosStateReserve.3、Whydoestheauthorwritethispassage?A．Tointroducesomepicnicareas.B．Tosharepersonalstoriesaboutpicnics.C．Totellreaderssomegoodwaystorelax.D．Toofferreaderstipsforwinterholiday.4、Wherecanwemostprobablyreadthispassage?A．Inapersonaldairy. B．Inasciencereport.C．Inatravelmagazine. D．Inageographytextbook.22．（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．Howtotakeaplane23．（8分）Theairwebreatheissofreelyavailablethatwetakeitforgranted.Yetwithoutitwecouldnotsurvivemorethanafewminutes.Forthemostpart,thesameairisavailabletoeveryone,andeveryoneneedsitSomepeopleusetheairtoliveonwhiletheysitaroundandfedsorryforthemselves.OthersbreatheintheairandusetheenergyitprovidestomakeamagnificentJifeforthemselves.Opportunityisthesameway.Itiseverywhere.Opportunityissofreelyavailablethatwetakeitforgranted.Yetopportunityaloneisnotenoughtocreatesuccess.Opportunitymustbeseizedandacteduponinordertohavevalue.Somanypeoplearesoanxiousto“getin”ona“groundflooropportunity”,asiftheopportunitywilldoallthework.Thatisimpossible.Justasyouneedairtobreathe,youneedopportunitytomakeit.Ittakesmorethanjustbreathinginthefreshairofopportunity,however.Youmustmakeuseofthatopportunity.Thatisnotuptotheopportunity.Thatisuptoyou.Itdoesn’tmatterwhat“floor”theopportunityison.Whatmattersiswhatyoudowithit.1、Whatisthepurposeofthefirstparagraph?A．Introducethetopicofthepassage.B．Compareairtoopportunity.C．Presenttherelationshipbetweenhumanandair.D．Toshowtheimportanceofair.2、Whichofthefollowingmaybeusedasthetittleofthepassage?A．AirandOpportunityB．SeizetheOpportunityC．HowtoSucceedD．BreathetheFreshAir3、Theauthorwantstoadviseusto______.A．breatheintheairB．sitaroundandfeelsorryC．beuptotheopportunityD．makeuseoftheopportunityandactonimmediately24．（8分）Forcenturies,medicalpioneershaverefinedavarietyofmethodsandmedicinestotreatsickness,injury,anddisability,enablingpeopletolivelongerandhealthierlives.“Asalamander(asmalllizard-likeanimal)cangrowbackitsleg.Whycan'tahumandothesame?”askedPeruvian-bornsurgeonDr.AnthonyAtalainarecentinterview.Thequestion,areferencetoworkaimingtogrownewlimbsforwoundedsoldiers,capturestheinventivespiritofregenerativemedicine.Thisinnovativefieldseekstoprovidepatientswithreplacementbodyparts.Thesepartsarenotmadeofsteel;theyaretherealthings---livingcells,tissue,andevenorgans.Regenerativemedicineisstillmostlyexperimental,withclinicalapplicationslimitedtoproceduressuchasgrowingsheetsofskinonburnsandwounds.Oneofitsmostsignificantadvancestookplacein499，whenaresearchgroupatNorthCarolina’sWakeForestInstituteforRegenerativeMedicineconductedasuccessfulorganreplacementwithalaboratory-grownbladder.Sincethen,theteam,ledbyDr.Atala,hascontinuedtogenerateavarietyofothertissuesandorgans—fromkidneystoears.Thefieldofregenerativemedicinebuildsonworkconductedintheearlytwentiethcenturywiththefirstsuccessfultransplantsofdonatedhumansofttissueandbone.However,donororgansarenotalwaysthebestoption.Firstofall,theyareinshortsupply,andmanypeoplediewhilewaitingforanavailableorgan;intheUnitedStatesalone,morethan100,000peoplearewaitingfororgantransplants.Secondly,apatient’sbodymayultimatelyrejectthetransplanteddonororgan.Anadvantageofregenerativemedicineisthatthetissuesaregrownfromapatient’sowncellsandwillnotberejectedbythebody’simmunesystem.Today,severallabsareworkingtocreatebioartificialbodyparts.ScientistsatColumbiaandYaleUniversitieshavegrownajawboneandalung.AttheUniversityofMinnesota,DorisTaylorhascreatedabeatingbioartificialratheart.Dr.Atala’smedicalteamhasreportedlong-termsuccesswithbioengineeredbladdersimplantedintoyoungpatientswithspinabifida(abirthdefectthatinvolvestheincompletedevelopmentofthespinalcord).AndattheUniversityofMichigan,H.DavidHumeshascreatedanartificialkidney.Sofar,thekidneyprocedurehasonlybeenusedsuccessfullywithsheep,butthereishopethatonedaysimilarkidneywillbeimplantableinahumanpatient.Thecontinuingresearchofscientistssuchasthesemayeventuallymakedonororgansunnecessaryand,asaresult,significantlyincreaseindividuals’chancesofsurvival.1、Inthelatestfieldofregenerativemedicine,whatarereplacementpartsmadeof?A．Donatedcells,tissuesandorgans. B．Rejectedcells,tissuesandorgans.C．Cells,tissuesandorgansofone’sown. D．Cells,tissuesandorgansmadeofsteel.2、Whathavescientistsexperimentedsuccessfullyonforabioartificialkidney?A．Patients B．RatsC．Sheep D．Soldiers3、Whyisgenerativemedicineconsideredinnovative?A．Itwillprovidepatientswithreplacementsofttissues.B．Itwillstrengthenthehumanbody’simmunesystem.C．Itwillshortenthetimepatientswaitingforadonatedorgan.D．Itwillmakepatientslivelongerwithbioartificialorgans.4、Whatisthewriter’sattitudetowardsregenerativemedicine？A．Positive. B．Negative.C．Doubtful. D．Reserved.25．（10分）Therewasalotofnewsrelatedtoartificialintelligence,orAI,andmachinelearning.Amongthestoriesweretwodealingwithdirectcompetitionsbetweenhumansandmachines.Inonecompetition,machinesthatusedAIperformedbetterthanhumanbeingsinahigh-levelreadingtest.Twonaturallanguageprocessingtoolsbeathumanintheexperiment.OneofthetoolswasbuiltbytheAmericantechnologycompanyMicrosoft.TheotherwascreatedbyChineseonlinesellerAlibabaGroup.Inanothercompetition,acomputertookonhumansinlive,publicdebates.TheeventdemonstratedhowAI-poweredcomputersareincreasinglybeingdevelopedtothink'andsoundlikehumans.Theorganizerofthedebates,U.S.technologycompanyIBM,announcedsplitresults.Itsaidamajorityofthosewatchingsaidtheyfeltthemachinehaddonemoretoimprovetheirknowledgeofthesubject.But,thehumangotmorepraiseforcommunicatingtheirideas.Thisyear,wealsoexploredthemanywaysAIandmachinelearningarenowbeingused.Forexample,someU.S.judgesusemachinelearningsystemstohelpthemdecidewhen,andforhowlong,criminalsshouldbejailed.Thesystemusescomputerstoexaminedatafromthousandsofcourtcases.Onefast-growingareaofAIisfacialrecognition,whichisincreasinglybeingusedforsecuritypurposes.Recently,Atlanta'sHartsfield-JacksonairportbecamethefirstintheU.s.topermitpassengerstousefacialrecognitiontechnologytogetonflights.AChinesecompanyshowedoffanAIsystemitdevelopedtorecognizeindividualsbybodyshapeandwalkingmovements.ThesystemisalreadybeingusedbyChinesepoliceinBeijingandShanghai.Inaddition,machinelearningwasusedduring2018topredictresultsoftheWorldCupsoccercompetition.Thetechnologyalsocreatedartworkthatsoldforalargeamountofmoney.Anditisbeingusedtohelpfarmersavetimeandmoney,whilereducingenvironment-harmingchemicals.Othertechnologysystemsarebeingusedtofollowfarmanimalsandwildlifetocollectinformationontheiractivities.1、Whywerethetwocompetitionsmentionedinthepassage?A．ToshowhowmuchbetterAIandmachinelearningarethanhumans.B．ToproveAIandmachineLearninggotmorepraiseforcommunication.C．ToshowhowpowerfulAIandmachineLearningare.D．ToproveAIandmachinelearninghavebeenusedintheworkofU.S.judges.2、Whatarefacialandbodyrecognitionsystemsusedforinthepassage?A．Knowledgelearning.B．Safetycontrol.C．Officeautomation.D．Trackingsurvey.3、Whatcanweinferfromthispassage?A．AIhasbeenwidelyusedineveryperson'sdailylife.B．HumancanbereplacedbyAIinfuturecompletely.C．MoreattentionisbeingpaidtoAIineverypartoftheworld.D．MoreadvancedAlishelpingpeopleinmoreandmoreareas.4、Whereisthetextprobablyfrom?A．Atechnologyreport.B．Anaturalsciencemagazine.C．Asciencefiction.D．Agovernmentdocument.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）Barefootanddirty，thegirljustsatandwatchedthepeoplegoby．Shenevertriedtospeak．Manypeoplepassed，butneverdidonepersonstop．ThenextdayIdecidedtogobacktothepark，curioustoseeifthelittlegirlwouldstillbethere．Rightintheveryspotasshewasyesterday，shesatwiththesaddestlookinhereyes．TodayIwastomakemyownmoveandwalkovertothelittlegirl．Asweallknow，aparkfullofstrangepeopleisnotaplaceforyoungchildrentoplayalone．AsIbeganwalkingtowardsher，Icouldseethebackofthelittlegirl’sdressindicatedadeformity（畸形）．Ismiledtoletherknowitwasokay，Iwastheretohelp，totalk．Isatdownbesideherandopenedwithasimple“Hello”．Ismiledandsheshylysmiledback．Wetalkeduntildarknessfellandtheparkwascompletelyempty．Iaskedthegirlwhyshewassosad．Thelittlegirllookedatmeandwithasadfacesaid，“BecauseI’mdifferent．”Iimmediatelysaid“Thatyouare!”andsmiled．Thelittlegirlactedevensadder．Shesaid，“Iknow．”Shelookedatmeandsmiled．Slowlyshestoodtoherfeet，andsaid，“Really?”“Yes，dear，you’relikealittleguardianangelsenttowatchoverallthosepeoplewalkingby．”Shenoddedherhead“yes”andsmiled，andwiththatshespreadherwingsandsaidwithatwinkleinhereye，“Iam．I’myourguardianangel．”Iwasspeechless，sureIwasseeingthings．Shesaid，“Foronceyouthoughtofsomeoneotherthanyourself，myjobhereisdone．”ImmediatelyIstoodtomyfeetandsaid，“Wait，sowhydidnoonestoptohelpanangel!?”Shelookedatmeandsmiled，“You’retheonlyonewhocouldseeme，andyoubelieveitinyourheart．”…andshewasgone．Andwiththatmylifechangeddramatically．So，whenyouthink1，remember，yourangelisalwayswatchingoveryou．Mineis!1、Peoplejustpassedbythegirlbecause_______．A．theypretendednottoseeherB．shepretendedtobepoorC．theyneverthoughtofhelpingherD．theyknewtheauthorwouldhelpher2、Whichwordcan’tbeusedtodescribetheauthor?A．Considerate． B．Patient． C．Helpful． D．Powerful．3、Whywastheauthorspeechless?A．Hewasshocked． B．Hedidn’tmanagetohelpthegirl．C．Hethoughthewascheated． D．Hewasindespair．4、WhichofthefollowingstatementsisTRUE?A．Theauthorsmiledbecausehesawthegirlwasshy．B．Theauthorhadknownthatthegirlwasarealangel．C．Theauthorbelievedthatanangelwasalwayswatchinghim．D．Theauthordecidedtogobacktotheparkbecausehewassurethatthelittlegirlwouldbethere．5、Whatdoes“You’reallyouhave”mean?A．Youareugly． B．Youarealone．C．Youarestrong． D．Youarerich．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）KiyotoSaitoistryingtochangepeople’sopinionofagriculturalworkthroughhisunusualattire(打扮).Whetherhe’sdrivingatractor1．isstandinginthefields,Kiyotoisalwayswearinganelegantsuit.Kiyoto’sfamilyhasbeenplantingriceforaround400years,butasateenagerhe2．(find)thetraditionboringandmovedtothecity.Hereturnedtohisnativetowntwoyearsago,3．(determine)togetinvolvedinthefamilybusiness.4．ideaofwearingasuitinthefieldsstartedasajoke.Oneday,hisbrotherjokedaboutfarminginanelegantsuit,butKyiototookit5．(serious).Heviewedtheideaastheperfectwaytochangepublicopinionofagriculturalwork.“Mostpeoplethinkoffarmers6．‘dirtyallday’.Iwantyoungsterstothink‘farminglooksfun’”hesaid.Atfirstnooneseemed7．(understand)him.Evenhisfamilywassurprisedbyhis8．(choose)offarmingattire.Hisgrandfatherworried9．(do)farmworkinasuitwouldbedangerous.NowKiyotoisfamousandhasbeeninvitedonvarioustelevisionshows.Healsohasablogwhereheregularly10．(post)hisfarmingexperiencesandphotosofhimselfalldressedup.第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）IwaspleasedtohearfromyouandIamwrittentotellyousomethingaboutthechangesinmyschool.Youareright.Greatchangeshavebeentakenplaceinmyschool.Itisnotlongerwhatitusedtobethreeyearsago,whentherewereonlyoneteachingbuildingandaplayground.Iamhappytotellyoutwonewbuildingshadbeenbuiltandareonuse.Oneofthemisanewclassroombuilding,initthereareroomsformusic,artsandcomputerteaching.Theotherisalibrary,wherethereareallkindsofbooks,newspapersandmagazines.However,myschoolisgoodequippedwithsportsfacilitiesandmusicalinstruments.Thenumberofstudentshasalsogrownfrom1,500to2,500.What’smore,wehadplantedalotoftreesandflowersinandaroundtheschool.Ibelievemyschoolbecomebetterandbetter,andIhopeyouwillvisitmyschoolagain.第二节书面表达（满分25分）29．（25分）假设你是李华，你的美国笔友Peter对中国春联(SpringFestivalcouplets）产生了浓厚的兴趣，来信向你了解中国的春联文化。请你回信为他介绍春联的用途、内容和寓意等。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、C2、B3、D4、C5、C6、A7、B8、B9、D10、D11、B12、C13、B14、C15、D16、A17、D18、C19、C20、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、B2、D3、A4、C22、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.Themajorproblemwiththespacetrashisthatitmayhitworkingsatellites