廣東省七校聯(lián)合體2025屆高三第二次診斷性檢測(cè)英語試卷注意事項(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(qǐng)按要求用筆。3．請(qǐng)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．youcanlearntoappreciatethechallengesinlife,youwillfindinnerstrength.A．WhenB．WhileC．BeforeD．Unless2．Whenwas_____youlastmetJennifer?Ihaven’tseenherforages.A．itthat B．it C．itwhat D．what3．IadmiremyEnglishteacher.Icanrememberveryfewoccasions_____shestoppedworkingbecauseofillhealth.A．that B．whenC．where D．which4．______suchaproblembefore,wehandledthesituationverywellthistime.A．Dealwith B．DealingwithC．Todealwith D．Havingdealtwith5．Whenonholidays,therailwaysputontrainstomakepeople’stravelmoreconvenient.A．regularB．specialC．particularD．unusual6．Theboythefirstprize,buthewassocarelessastomakeafoolishmistake.A．musthavegained B．needhavegainedC．couldhavegained D．shallhavegained7．Theaimofthegovernmentistomakeeverycitizenbetteroff,____,tohelpthemliveahappylife．A．a(chǎn)saresult B．forastartC．foronething D．inotherwords8．一Didyouforgetyourpromise,dear?一Ihavefinishedmyhomeworkontime,mom.A．Excuseme. B．Surely.C．Whynot? D．HowcouldI?9．—Didyouenjoytheparty?—Yes.We___________wellbyourhosts.A．weretreated B．wouldbetreatedC．treated D．hadtreated10．Lisawouldn’t________thejobanymore.Shehadabigargumentwithherbossandresigned.A．comeupwith B．keepupwithC．makeupwith D．putupwith11．–MyTVsetdoesn’twork,thewatertapisdrippingandmycarisstillunderrepair!–Yousure________badluckthesedays.A．had B．willhave C．hadhad D．a(chǎn)rehaving12．Ifyouweretohaveafewminutesfree,I______theopportunitytoaskyouonemorequestion.A．wouldappreciate B．wouldhaveappreciatedC．weretoappreciate D．hadappreciated13．—IhavesomethingimportanttotellJohn.ButIcan’tfindhim.—Hiscellphoneishere,sohe________havegonetoofar.A．mustn’t B．needn’tC．wouldn’t D．can’t14．Howlongdoyousupposeitis________________hearrivedandbegantoworkthere？A．when B．beforeC．a(chǎn)fter D．since15．---Mum,canyoutellmewhysomeparentssendtheirchildrentostudyabroadataveryyoungage?---__________,darling.Ihaveneverthoughtaboutit.A．YouhavegotmethereB．TakeyourtimeC．YoubetD．Don’tbesilly16．Iknowhefeelsupsetabouthisfailure,andIcan_____that.A．relateto B．livewithC．a(chǎn)nswerfor D．pullthrough17．－Whatiftherainstormcontinues?－Comeonguys!Wehavetomeetthe_______whatevertheweather.A．standard B．demandC．deadline D．satisfaction18．Housepricesareusuallymuchhigher________therearesubwaystationsaround.A．where B．unless C．while D．though19．Sallylikesgoingtoschool______shehasgotmanygoodfriendsthere.A．or B．because C．unless D．so20．Thankstothe“sugartax”，foodfactorieshavereducedsugarintheirproducts,________about45millionkilogramsofsugar.A．tosaveB．savedC．savingD．havingsaved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）DavidReesrunsatrulydistinctivebusiness.Hechargescustomers$15tosharpentheirpencilstoperfections,usingavarietyoftools.Iknowwhatyou'rethinking—isthisajoke?The39-year-oldgetsaskedthatquestionalot.Toclarifyeverything,heevencreatedaspecialsectiononhiswebsitetellingeveryonehe'sactuallyprovidingarealservice.YoucansupplyyourownpenciloryoucanhaveReessharpenoneofhisownfavorite2Bpencils.Afterthat,hemailsittoyouinadisplaytubewiththeshavingsinaseparatebag,andanauthenticcertificatewhichjusthappenstomentionthepencilissosharpastobeadangerousobject.Toachievethedesiredresult,themastersharpenerusesallkindsoftools,includinggeneralsandpapers,pocketknivesandevenaspecial$450sharpeningmachine."Itdependsonwhatthecustomerwantstousehis/herpencilfor,"hesays."Thatdeterminesthemostappropriatepencil-sharpeningtechnique.Somecustomersbuypencilsasinspirationalsymbolswhileothersbuythembecauseoftheirspecialmemoriesofclassic2Bpencils.$15tohaveapencilsharpenedisabitexpensivethough,right?You'renottheonlyonewhofeelsthatway,andDavid'suniquebusinesshasreallyangeredlotsofpeople,whotalkofinequalityinAmerica,sayingitissoinsaneforthewealthytopay$15tosharpenapencil.Butotherswillsay,"Thisisjustoururgetoputanendtothewelfarestatebecausenewideasarisealongwiththebusiness."Davidadmitshistradeissortofunusual.Buttherearethosewhoactuallyvaluehisservice,asprovenbytheover500ordershehasgotten.1、HowcouldDavidmakemoneybysharpeningpencils?A．Heinventednewtoolsforthejob.B．Hepromotedhisskillonhiswebsite.C．Hesavedlotsoftimeforotherpeople.D．Heprovidedqualityservicetohiscustomers.2、Fromhiswords,wecaninferthatDavidBees.A．knowsallkindsofpencilusers B．providespersonalizedservicesC．valuesideasbehindthepencils D．a(chǎn)lwayswritewithpencils3、Whatdoestheunderlinedword"insane"(inParagraph5)mean?A．Deliberate. B．Rewarding.C．Unreasonable. D．Irresponsible.4、Whatseemstobetheauthor'sattitudetoDavidBees'trade?A．It'safancyservice. B．Ithasagoodreputation.C．It'sawfullyexpensive. D．Itwastestimeandmoney.22．（8分）Supermarketshelvesarefilledwithplant-basedalternativestocowmilk,includingsoy,nut,andcoconutmilk.Theseproductsarepopularwithconsumerswhocannotdrinkcows’milkforhealthreasons,aswellaswiththoseconcernedaboutanimalwelfareandenvironmentalsustainability.Whilethedairy-free(非乳制的)optionsworkwellwithcerealorincoffee,theyfailmiserablywhenitcomestomakingmilk-basedproductslikecheeseoryogurt.However,theseshortcomingsmaysoonbeathingofthepast,thankstoanewcompanyinCalifornia,whichhasfiguredouthowtocreateanimal-freemilkinalaboratory!PerumalGandhiandRyanPandyafoundedthecompanyin2014afterbecomingincreasinglyannoyedwiththelackofcows’milk-freealternatives,particularlyforcheese.ForGandhi,whostoppedconsuminganimalproductsfiveyearsearlierduetoenvironmentalandanimalwelfareconcerns,themotivationtocreateabetteralternativestemmedfromhisloveofcheesypizza.Pandyawasspurredintotakingactionafterbeingforcedtoeatsome“reallybad”dairy-freecreamcheeseonhissandwichThetwoMITbiomedicalengineeringscientistsdecidedtojoinforcestocreateamorerealisticalternativetodairy-basedproducts.Intheiruniversitylab,thepairspentninemonthsfirstisolatingcowDNAtheninsertingitintoyeast(酵母).Thisgeneticmodificationenabledtheyeasttoproducethenecessarymilkproteins.Thefinalstepoftheprocessinvolvedmixingtheproteinswithsomeplantnutrientsandfats.Thedairy-freemilknotonlytastesliketherealthingbutisalsohealthier,hasalongershelflifeand,mostimportantofall,isEarthfriendly.Accordingtothecompany’swebsite,whencomparedtoconventionalmilkproduction,theirprocessuses65%lessenergy,creates84%olessgreenhousegasemissionsandrequires91%lesslandandanamazing98%lesswater!Bestofall,sinceitcontainsrealmilkproteins,theproductbehaveslikethecow-producedversion,whichmeansvegetarianconsumerswillnolongerhavetodealwithsoggycheeseontheirsandwichesandpizzas.Thecompanyplanstobringtheircreationtomarketlaterthisyearandtheirfirstproductwillmostlikelybecheesesincetherearealreadynumerousgoodcows’milkalternativesavailabletoconsumers.1、Theunderlinedword"those"inparagraph1refersto_______.A．a(chǎn)lternativesB．peopleC．productsD．reasons2、Thecompanysfoundersweremotivatedtomakethenewproductbecauseof_______.A．theirdeepconcernfortheenvironmentB．theirworrythatfarmanimalswerepoorlytreatedC．theover-consumptionofthedairy-basedproductsD．thepoortasteofdairy-freecheesepresentlyavailable3、Whatcanbeinferredfromparagraph4?A．Thedairy-freeproductscannotbestoredforalongtime.B．Thenewproductswilltastebetterthandairy-basedones.C．Cowfarmingcausesconsiderableenvironmentaldamage.D．Thedairy-freemilkwillbemoreexpensivethancow’smilk.4、Whichofthefollowingcanbethebesttitleforthetext?A．HealthierCheeseB．NewMilkSavesPlanetC．FresherMilk,BetterFutureD．MakingMilkwithoutCows23．（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(jiǎn)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．Howtotakeaplane24．（8分）Mostofushavebeeninthissituation:You'reonyourwaytoyourfriend'shouse,thenyousuddenlyaskyourself,"DidIremembertoturnthelightsoff?”Forthosewith"smarthomes",however,thiswouldn’tbeaproblem.Overthelastfewyears,smarthometechnologyhasbecomemorepopular.Thankstouser-friendlyproductslikeintelligentlightingandheatingcontrollers,peoplecancontrolnearlyeveryelectricalitemintheirhomesfromanywhereintheworld.Whilesmarthomesaren'tnew,companieslikePhilips,AmazonandXiaomihavefinallybroughtautomationtoeverydaypeoplewithaffordableproductslikeartificialintelligence(AI)speakersandsensors.“Theobviousmessageisthatyoucanstopwastingenergy,”TomKerber,directorofresearchforU.S-baseddigitalcompanyParksAssociates,toldTheGuardian.Andthetechnologyalsohasmoremeaningfuluses.InNorway,forexample,onecompanyisusingsmarttechtomakelifeeasierforitselderlycustomers.Abilia'ssystemallowscarerstocheckuponpatientsthroughatabletonawallinsidetheirhome.Thedevicesendspatientsremindersabouttasks,suchaswhentheyneedtotakemedication(冥想).Itcaneventellcarersifthere'sanyunusualactivityinthehomethatcouldbelife-threatening.“Thiskindofsystemallowspeopletotakecareofthemselves,whichisthemostimportantthing,”Abilia'svicepresident,OysteinJohnsen,toldtheBBC．"Italsosavesthegovernmentmoney.InNorway,itcosts1millionkroner(about0.8millionyuan)peryeartohavesomeoneinacarehome.Thissystemcosts15,000kronerayear.”So,forthosewhohavealready"gonesmart",williteverbepossibletogobacktodothingsintheold-fashionedway?"Ithinkitwouldbedifficult.Whenwegotoafriend’shouseoronvacationwefindourselvesexpectingthehousetodothingsforusthatweshoulddo,"Poulson,35,aseniorprogrammanagerfromSeattle.,U.S.,explained.1、Whatarethefirstandsecondparagraphsusedfor?A．Introducingthetopic.B．Describingthesituation.C．Advertisingsmarthomes.D．Puttingforwardtheauthor'sopinion.2、WhatdoPhilips,AmazonandXiaomihaveincommon?A．Theyarealldesigningsmarthomes.B．TheyareallU.S-baseddigitalcompany.C．They'vealladvancedinsmarttechnology.D．They'veallreceivedaffordableproductsautomatically.3、WhatdoesAbilia'ssystemallowuserstodoinNorway?A．Totakecareofthemselves.B．Tobuyuser-friendlyproducts.C．Tocontrolheatingandcooling.D．Toswitchlightsthroughatablet.4、what'sPoulson'sattitudetosmarttechnology?A．Cautious.B．FavorableC．Ambiguous.D．Disapproving.25．（10分）Campingwildisawonderfulwaytoexperiencethenaturalworldand,atitsbest,itmakeslittleenvironmentalinfluence.Butwithincreasingnumbersofpeoplewantingtoescapeintothewilderness,itisbecomingmoreandmoreimportanttocampunobtrusively(不引人注目地)andleavenomark.Wildcampingisnotpermittedinmanyplaces,particularlyincrowdedlow-landBritain.Whereveryouare,findoutaboutorganizationsresponsibleformanagingwildspaces,andcontactthemtofindouttheirpolicyoncampingandshelterbuilding.Forexample,itisfinetocampwildinremotepartsofScotland,butinEnglandyoumustaskthelandowner'spermission,exceptinnationalparks.Campingisabouthavingrelaxation,sleepingoutdoors,experiencingbadweather,andmakingdowithoutmodernconveniences.Abusy,fully-equippedcampsite(野營地)seemstogoagainstthis,soseekoutsmaller,moreremoteplaceswitheasyaccesstoopenspacesandperhapsbeaches.Betterstill,findacampsitewithnoroadaccess;walkinginmakesarealadventure.Findingtherightspottocampisthefirststeptoguaranteeingagoodnight'ssleep.Chooseacampsitewithprivacyandminimuminfluenceonothersandtheenvironment.Trytouseanareawherepeoplehaveobviouslycampedbeforeratherthancreatinganewspot.Whencampinginwoodland,avoidstandingdeadtrees,whichmayfallonawindynight.Avoidanimalrunsandcaves,andpossiblehomesofbitinginsects.Makesureyouhavemostprotectiononthewindwardside.Ifyoumakeafire,dosodownwindofyourshelter.Alwaysconsiderwhatinfluenceyoumighthaveonthenaturalworld.Avoiddamagingplants.Agoodcampsiteisfound,notmade—changingitshouldbeunnecessary.1、Youneedn'taskforpermissionwhencampingin________.A．nationalparksinEnglandB．mostpartsofScotlandC．crowdedlow-landBritainD．mostpartsofEngland2、Theauthorthinksthatagoodcampsiteisone________.A．witheasyaccessB．usedpreviouslyC．withmodernconveniencesD．farawayfrombeaches3、Thepassageismainlyabout________.A．theprotectionofcampsitesB．theimportanceofwildcampingC．thehumaninfluenceoncampsitesD．thedosanddon'tsofwildcamping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）完形填空（共15小題；每小題2分，滿分30分）閱讀下面短文，掌握其大意，然后從下列各題所給的A、B、C和D項(xiàng)中，選出最佳選項(xiàng)，并在答題卡上將該項(xiàng)涂黑。AnEnglishpadre（神父）wantedtobecomeamemberofacertainclubinAfrica.Inordertobecomeamember,eachpersonhadto1atleastonelion.Thepadrehadnevershotananimalforhislife.So,armedwitharifleandledbyayoungAfricanboy,thepadresetoutoneeveningforapoolinthejunglewherehewastoldalioncameeacheveningto2.Hewaitedpatientlyforafew3untilshortlybeforemidnightwhenheheardarustling(沙沙聲)noise.Sureenoughafewfeetawaytheheadofthelionappearedaboveabushthatseparatedthepadreandthepool.Heaimedandfired.Theheadofthelion4fellbehindthebushbutamomentlater5.Sothepadreaimedand6again.Theheadofthelionfellbehindthebushandoncemorereappeared.Thepadrefiredagain:thesame7.Heremainedcalmbecausehe8hehadbroughtsixteenbulletswithhim.Afterhisfourthtry,hisaimseemedtobecomemoreandmore9:infact,afterhis10trytheAfricanboyhadto11him:“Thisisyourlastchance.Ifyou12thistime,weareintrouble.”Thepadrethenrealizedhow13thesituationwas,sohetookadeepbreath,aimedverycarefullyandfired.Theywaitedforamoment,andthenslowly14uptotwenty:theheadoftheliondidnotreappear.Thepadrewascertainthatatlasthehadshothislion.They15forwardtogethertothespotbehindthebush.Andwhatdoyouthinktheyfound?Sixteenlions!1.A．shoot B．kill C．catch D．hurt2.A．eat B．walk C．drink D．hunt3.A．minutes B．seconds C．days D．hours4.A．fast B．immediately C．once D．directly5.A．turned B．reappeared C．returned D．moved6.A．killed B．jumped C．fired D．tied7.A．result B．situation C．a(chǎn)nswer D．problem8.A．a(chǎn)cknowledged B．understood C．believed D．knew9.A．inaccurate B．unnecessary C．impossible D．indirect10A.last B．fifteenth C．sixteenth D．many11.A．tell B．frighten C．warn D．remain12.A．fell B．shot C．fired D．missed13.A．difficult B．serious C．exciting D．mad14.A．counted B．waited C．a(chǎn)dded D．named15.A．drove B．rushed C．wandered D．climbed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）Itisagreat1．(true)thatlifeisdifficult.Oncewereallyunderstandandacceptit,thenlifeisnolongerdifficult.2．,mostofusdonotfullyseeit.Theyjustcomplainabouttheirproblemsanddifficultiesasiflifeshouldbeeasy.3．makeslifedifficultisthattheprocessoffacingandsolvingproblemsisareallypainfulone.Problems,4．(base)ontheirnature,causesadnessorregretorangerorfear.Theseare5．(comfort)feelings,oftenaspainfulasanykindofphysicalpain.Itisinthewholeprocessofsolvingproblems6．lifehasitsmeaning.Problemsaretheserioustestthattellsussuccessfromfailure.Whenwewanttostrengthenthegrowthofhumanspirit,weencouragethehumanability7．(solve)problems,justasinschoolwesetproblemsforourchildrentodealwith.8．(learn)fromthepainofmeetingandworkingoutproblemsis9．greatbenefit.AsBenjaminFranklinsaid,“Thosethingsthathurt,instruct.”Forthisreason,wisepeoplelearnnottofearbuttowelcome10．painofproblems.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(qǐng)你修改你同桌寫的以下作文。文中共有10處語言錯(cuò)誤，每句中最多有兩處。每處錯(cuò)誤僅涉及一個(gè)單詞的增加、刪除或修改。增加：在缺詞處加一個(gè)漏字符號(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)的詞下劃一橫線，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。

ItookatriptoChinaafewmonthsbefore．Itwasawonderfulexperiencewhereisbeyonddescription．WespentthreeweeksvisitingBeijing，Shanghaiandseveralothertouristattraction．ThecloserweapproachedthecentreofChina，themuchIlikedit．ThenwewenttoHongKonglastweek，whichIthinkisdifferentwithBeijing．ItisnoisiestplaceIhaveeverseen．Andanotherthingthatgivemeadeepimpressionwasthepeoplethere—theyweresomuchfriendly．Anyway，thetripitselfwasinterested．Ican’twaittoflyingtoChinaagain、第二節(jié)書面表達(dá)（滿分25分）29．（25分）假定你是李華。你曾寫信給你以前的英語老師MissKane，請(qǐng)教提高英語閱讀能力的方法。她四月三號(hào)給你回信，建議你多閱讀?，F(xiàn)請(qǐng)你給她回信，表示同意她的建議，并決定立即認(rèn)真讀書。注意:1.詞數(shù)100個(gè)左右；2.可適當(dāng)增加細(xì)節(jié),以使行文連貫；3.信的開頭和結(jié)尾已給出，但不計(jì)入總詞量。DearMissKane,_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Yours,LiHua

參考答案第一部分（共20小題，每小題1.5分，滿分30分）1、A2、A3、B4、D5、B6、C7、D8、D9、A10、D11、D12、A13、D14、D15、A16、A17、C18、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(gè)選項(xiàng)中，選出最佳選項(xiàng)。21、1、D2、B3、C4、A22、1、B2、D3、C4、D23、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-madetrashorbitingtheEarthatspeedsofupto17,500m