河北省鹿泉等名校2023年高三下学期联合考试英语试题含解析

2023高考英语模拟试卷考生须知：1．全卷分选择题和非选择题两部分，全部在答题纸上作答。选择题必须用2B铅笔填涂；非选择题的答案必须用黑色字迹的钢笔或答字笔写在“答题纸”相应位置上。2．请用黑色字迹的钢笔或答字笔在“答题纸”上先填写姓名和准考证号。3．保持卡面清洁，不要折叠，不要弄破、弄皱，在草稿纸、试题卷上答题无效。第一部分（共20小题，每小题1.5分，满分30分）1．TheleadersoftheBRICScountriesFridayreachedimportant________onbuildinganopenworldeconomyandimprovingglobaleconomicgovernance(管理)duringtheirinformalmeetingonthesidelinesoftheG20SummitinHamburg,Germany.A．considerationB．consensusC．commitmentD．confirmation2．—Whatdoyouthinkofyourpreparationsforthefinalexams?—Notsogood.ActuallyIfeellike______forI’vemadelittleprogressinMaths.A．Danielinthelion’sden B．Achilles’heelC．agoodSamaritan D．asacredcow3．Jasonwillneverforgetabouthis18thbirthday,sawhisbeingadmittedtoHarvard.A．when B．which C．that D．it4．AmericansingerTaylorSwift,21,________bigatthe2011AcademyofCountryMusicAwardsintheUSonApril3rd.A．stood B．gave C．scored D．made5．－prlfessor,doyouhavesomethingatthismoment?－No,thanks.I'llcallyouifthereisany.A．typing B．typed C．totype D．tobetyped6．MymotherisalwayswarningmewhenIgoout,“Don’tgetoffthebus________itisstopping.”A．untilB．whileC．beforeD．after7．—Lookingbackon_____inyearsgonebyandthegoodtimethatIhadmakestodayseemrathersad.—Absolutely.Somuchhaschanged.A．howitwas B．whoitwas C．howwasit D．whowasit8．Yourdonationgreatlyappreciatedandthemoneywillbeusedtohelpthestudentsfrompoorfamilies.A．hasbeenB．isC．wasD．hadbeen9．---HowwasyourtriptoXi'anlastmonth？--_____________.Itwasrainingcatsanddogsduringmystaythere.A．Wonderful B．ExcitingC．Notbad D．Itcouldn'tbeworse10．Afireworksdisplaywasorganized________theQueen’sbirthday.A．tomarkB．markedC．havingmarkedD．beingmarked11．Thenewsofthenewly-electedpresident’scomingtoChinaforavisitwas______ontheradiojustnow.A．givenaway B．givenin C．givenoff D．givenout12．Thefellowwespoke________nocommentatfirst.A．tomake B．tomadeC．made D．tomaking13．Withatravellingspeedofupto350kilometresperhour,therailwaytobebuiltbetweenBeijingandShanghai_______thejourneytimefrom12hoursto5hours．A．cuts B．willcut C．iscutting D．hascut14．---Thereareprobablyalienslivinghereonearth.---_____!Ican’tbelieveyousaidthat.A．Comeon B．ForgetitC．Goahead D．Allowme15．Itwasnotuntil3dayslaterthattheboycamebacktolifeandexplainedtothepolicewhat_______tohim.A．washappening B．wastohappen C．hadhappened D．hashappened16．WhenIwastwenty,Ihadto________beforegraduationandworkinaclothesshoptohelpsupportmyfamily.A．comeout B．stayoutC．leaveout D．dropout17．---ItwasSundaytoday,andI_______upveryearly.---Soyoureallyhadagoodrest.A．didn’tneedtoget B．needn’thavegot C．needn’ttoget D．don’tneedget18．—Didn’tyougofishingwithyourfriendslastSunday?—No.I______tothenursinghomeasusual.A．went B．go C．havegone D．hadgone19．Fromhisexpression,Idon’tthinkhecouldhavefinishedhishomeworklastnight,_______?A．couldn’the B．doIC．didhe D．hasn’the20．Asoftenhappensafterlongsleeplessness,hewas________byanunreasoningpanic.A．seizedB．fascinatedC．impressedD．embarrassed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）TraditionalChinesemedicine（TCM）isgainingglobalpopularity．Accordingtoagovernmentwhitepaper，TCMhasbeenintroducedin183countriesandregionsaroundtheworld．Westerners'understandingofTCM，however，maybelimitedtoacupuncture，cuppingandmassage（针灸，拔罐和按摩）．Forinstance，thepurple，injury﹣likemarksleftonU．S．swimmerMichaelPhelps，backfromcuppingforthepurposeofrelaxinghismusclesandreducingpainbecamethecenterofattentionduringtheRioOlympicsin2016．Asamatteroffact，ChineseherbsplayamoreimportantroleingettingridofdiseasesandkeepingthebodyingoodconditionintheTCMtreatmentsystemthanphysicaltreatment．Itisthereforedishearteningtoknowthatwhile103WorldHealthOrganizationmembercountrieshavegivenapprovaltothepracticeofacupuncture，notmanyrecognizeChineseherbalmedicine．TCMfallsfarbehindWesternmedicineowingpartlytotheslowdevelopmentofChineseherbs．Herbsaremadeintopills，powderandsoup，andthekindofherbsused，theirqualityandquantity，andtheprocessingoftheingredients（原材料）jointlydeterminetheeffectivenessoftheprescription．ComparedwithWesternmedicine，whichhasstandardizeddrugproductionprocessesandtreatmentmethods，TCMlacksstandardization，withthechemicalcompositionandfunctionsofitsmedicinesbeingunclearandtheireffectsbeingunstable．Fortunately，standardizationhasimprovedinrecentdecades，withanincreasingnumberoffactoriesproducingpatentedTCMdrugs．AnotherfactorthathaspreventedthedevelopmentofTCMprescriptiondrugsisthelackofcreativity．WhileWesternmedicine﹣makingcompaniescomeupwithnewproductseveryyear，TCMdrugproducerstendtomakemedicinesaccordingtoprescriptionshandeddownfromthepast．ChinesechemistTuYouyou'swinningthe2015NobelPrizeinPhysiologyorMedicineforherresearchintomalaria（疟疾）treatmentmaydrivecreativitytosomeextentinChina'sTCMindustry．However，thecurrentstateofaffairscannotbechangedwithinashorttime．1、WhydoestheauthormentiontheexampleofMichaelPhelps？A．Becausehewasinjuredinhisswimming．B．BecausecuppingisakindofimportantTCMtreatment．C．BecausewesternersknowalittleaboutTCM．D．BecausewesternersattachgreatimportancetoTCM．2、Whydon'tsomemembercountriesofWHOrecognizeChineseherbalmedicine？A．BecauseChineseherbscangetridofdiseases．B．Becausetheyonlyapprovethepracticeofacupuncture．C．BecauseWesternmedicineismoreeffective．D．BecausemedicinemadeoutofChineseherbsdevelopsslowly．3、ComparedwithWesternmedicine，whatistheweakpointofTCMinParagraph4？A．Themethodsofplantingherbs．B．Theeffectivenessofprescription．C．Lackinginstandardization．D．Itsstablefunctions．4、ThelackofcreativityinTCMreferstothefactthat．A．medicine﹣makingcompanieslackcreativityB．prescriptionsaregotfromthepastC．WesterncompaniesaremoreexperiencedD．medicine﹣makingcompanieslackdrivingforce22．（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）Whatwouldittaketogetyoutoputdownyourphoneduringameal?Sarah’sCornerCafeinStroudsburg,Pennsylvania,isofferingadealforpeoplewhowanttoenjoyameal,andeachother,unplugged.They’vesetupso-called“familyrechargingstations”attableswhereyoudropyourphoneintoabasket.“TheylettheserverknowandtheserverwillbringoverabasketwitholdfashionedHangmanandTicTacToeandpencilsbecausethosegamesareinteractiveinsteadofcoloring,whichissolitary(孤单的),”ownerBarryLynchtoldABCNews.Onceafamilyjoinsinthechallenge,staffbringgamestothetabletoencouragethefamilytointeractandcommunicatewithoneanother.Iffamiliesmakeitthroughthemealwithoutlookingattheirphones,they’rerewarded10percentofftheirbill.“Alotofpeoplearestartingtodoitandit’stakenonalifeofitsown,”saidLynch.Theideaforthe“familyrechargingtime”cametoLynchafterobservingmanyofhiscustomers.“There’soneparticularfamilyIknewusedtocomeinonSundayforbreakfastafterchurch,”herecalled.“EverytimeIwentover,oneortwoofthekidsandsometimestheparentswouldbeonthephone.IalsoknewthedadwouldgotoNewYorkforworkeveryday,whichtakesalotoftime.Iaskedhimaboutthatandhesaid,‘Yeah,Istilldoit.It’ssonicetobetogetherandthesebreakfastsarerare.’Andwhenhesaidthat,Ithought,‘Somethingisgoingonhere.Ineedtodosomething.’”Lynchisthrilledbytheresponsehisphone-freemealshavegottenandhopestheycontinuetoenrichhiscustomers’familytime.“Ijustthoughtitwassuchashamenottohavemoretimetogetherjusttotalk,”hesaid.1、Howcanafamilygeta10%discountatSarah’sCornerCafe?A．Theyhavephone-freemeals.B．Theytakenophonesformeals.C．Theykeeppoliteduringthemeals.D．Theyremainquietduringthemeals.2、Whydoserversbringoverthegamestothechallengers?A．Tocaterforthem.B．Totesttheircourage.C．Tomakethemcommunicate.D．Todeveloptheirgameskills.3、WhatdidBarryshowbytellingthefamily’sstory?A．Whyhehadpityonthefamily.B．Howthefamilyspenttheirweekend.C．Whythefamilymembersignoredeachother.D．Howhehadtheideaforfamilyrechargingtime.4、What’sthereactionofthecustomersabouttheirphone-freemeals?A．Passive.B．Positive.C．Casual.D．Doubtful.24．（8分）Theysaythatanappleadaykeepsthedoctoraway．Well,thereisoneladywhobelievesthatit’sactuallychocolate．At102yearsofage,she’slivingproof．AccordingtoBoonville,Indiana’sEuniceModlin,adailydoseofchocolatehasbeenthekeytoalongandhealthylife．Specifically,twopiecesofdarkchocolate．It’snotjustEunicewhobelievesthis．Manyscientistshaveattributedthesweettohealthbenefitssuchaslowerchancesofcancer,cardiovasculardisease,anddiabetes．However,researchersbelievethatEunicemightbeoverlookingthefactthatshehasneversmokedordrunkalcoholinherlonglife,andthatchocolatemightnotbethesignificantcauseofherlongevity．“Therearesomanyotherfactorstoherlonglifeandchocolateisn’ttheonlyone,”nutritionistVanessaRissettosaid．“Genes,herdietingeneral…areprobablythemainreasons.”Atanyrate,Euniceisstillaliveandkicking．Withfourchildren,sevengrandkids,14great-grandkidsand11great-greatgrandkids,thisladyhasabigfamily．ItmustbenotedthatEunicewasalsoveryathletic,beinganarcherinher20s．Amazingly,shehaslivedthroughtoughtimessuchastheGreatDepressionandWorldWarII．Also,thehealthybloodrunsthroughtheveinsofotherfamilymembers．Eunice’sbrotherisalsostillalive,at101yearsofage．Nomatterwhatyoumightthink,Eunice’sconsumptionofchocolatecan’tbeignored．In2015,aBMJstudyshowedthatadailytreatofonesmallbarwouldgivetheconsumer23%lesschanceofhavingastroke(中风)．Whatisinthesweetthatmakesitsobeneficial?Apparently,cocoabeanshaveflavonoids,plantnutrientsthathaveusefulantioxidants(抗氧化剂)．“Notallchocolateiscreatedequal,”Rissettowarns．“Darkchocolatehasmoreflavonoidsthanmilkchocolate,andwhitechocolate—whichdoesnotactuallycontainchocolate—isnotagoodsourceofflavonoids.”1、Accordingtothearticle,whichofthefollowingleadtoEuniceModlin’slongandhealthylife?a．twopiecesofdarkchocolateb．genesc．lifelongexercised．gooddiete．loveofherlargefamilyA．a,b,dB．b,c,dC．a,b,eD．a,c,d2、Rissettothinksthat．A．chocolateisthemostimportantthingthataffectsEunice’shealthB．nosmokingordrinkingcontributesthemosttoEunice’slongevityC．chocolatereallyhasnothingtodowithherlongandhealthylifeD．Eunice’sgooddietdoesn’tonlymeantakingchocolateeveryday3、Whattheauthorpresentedinthepassagesounds．A．persuasiveB．objectiveC．subjectiveD．critical4、Fromthewholepassagewecanconcludethat______________．A．there’suniversalproofforwhatcontributestoalonglifeB．itisgenerallyacceptedthatchocolateisthekeytolongevityC．manyfactorsmaycontributetopeople’sgoodhealthD．abitofanychocolateadaykeepsthedoctoraway25．（10分）Livingclosertoopenfieldsandtreesreducesyourriskofbeingobese（肥胖）,researchsuggestsandthebenefitscanbeseeneveninpoorneighborhoodswhererisksofbothobesityandpoormentalhealthareknowntobemuchhigher.Thenewstudy,supportedbyFriendsoftheEarthEurope(FoE),alsoshowedthatthegreatoutdoorshadbenefitsforpregnantwomen.Thoselivingclosetotreesandopenfields,considereda“naturalhealers”bytheresearchersattheInstituteforEuropeanenvironmentalpolicy,gavebirthtochildrenofmuchhealthiersizes.Itisbelievedthattheincreasedopportunitytobeactiveandbreathinginlessairpollutionmayexplainthereduceddeathratesandobesityprevention.Afterreviewinghundredsofpreviousstudies,scientistssayitcanevenreducethechanceofanearlydeathby16percentcomparedtothoselivinginan“urbanjungle.”Thegreenspacesalsoreduceddepression（抑郁）byallowingforpeopletomeetothersmoreeasilyandgetawayfrombusyandnoisyactivitiesofacity,expertsstate.RobbieBlake,acampaignerforFoE,toldTheGuardian:“Theevidenceisstrongandgrowingthatpeopleandcommunitiescanbeenergeticandlivelywhentheyhaveaccesstonature.“Weallneednatureinourlivesanditgivesusfreedomandhelpsuslivehealthily;yetpoorcommunitiesareroutinelycutofffromnatureintheirsurroundingsanditisholdingbacktheirwellbeing.”Thefindingsbackupmuchevidencethatshowssettingupahomeinaheavily-pollutedcitycanbedamagingtosomeone’shealth.Afterstudyingthewell-beingofnearly110,000women,theyfoundlivingincitiesalsoincreasedtheriskofcancerandrespiratory（呼吸）illnesses.Thoseinthegreenestareashada34percentlowerrateofrespiratorydisease-relateddeathsanda13percentlowerrateofcancerdeaths.1、WhatcanweknowaboutobesityfromParagraph1?A．Theoutdoorscanpreventobesity.B．Obesitycancausementaltrouble.C．Urbanmotherscanhaveobesebabies.D．Pregnantwomencangetobeseeasily.2、Whatisthesocialbenefitoflivinginthecountryside?A．Havingmorefreedomtorest.B．Meetingotherpeoplemoreconveniently.C．Breathinghealthierair.D．Keepingmorewealthandhappiness.3、Whatdoestheunderlinedword“We”inParagraph4referto?A．Pregnantwomen.B．Patientswithrespiratoryillnesses.C．Ordinarypeople.D．Peoplelivinginpoorcommunities.4、Whatisthebesttitleforthetext?A．WaysoflivinginthecountrysideB．LivinginhealthyneighborhoodsC．Countryside,thegreenestareaD．Accesstonature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）It’sabout250milesfromthehillsofwest-centralIowatoEhlers’homeinMinnesota.Duringthelongtriphome,followingaweekendofhunting.Ehlers1aboutthesmalldoghehadseen2alongsidetheroad.Hehad3tocoax(哄)thedogtohimbut,frightened,ithad4.Backhome,Ehlerswastroubledbythat5dog.So,fourdayslater,hecalledhisfriendGreg,andthetwodrove6.Afteralongandcareful7,Gregsaw,acrossafield,thedogmoving8away.Ehlerseventuallysucceededincoaxingtheanimaltohim.Nervousnessandfearwerereplacedwith9.Itjuststartedlicking(舔)Ehlers’face.Alocalfarmertoldthemthedogsoundedlikeone10aslostinthelocalpaper.Theadhada11numberforatowninsouthernMichigan.Ehlers12thenumberofJeffandLisatotellthemhehad13theirdog.Jeffhad14inIowabeforeThanksgivingwithhisdog,Rosie,butthegunshotshadscaredthedogoff.Jeffsearched15forRosieinthenextfourdays.EhlersreturnedtoMinnesota,andthendrove100milestoMinneapolistoputRosieonaflighttoMichigan.“It’sgoodtoknowthere’sstillsomeoneouttherewho16enoughtogotothatkindof17,”saysLisaofEhlers’rescue18.“Ifiguredwhoeverlostthedogwasprobablyjustas19toitasIamtomydogs,”saysEhlers.“Ifithadbeenmydog,I’dhopethatsomebodywouldbe20togothatextramile.”1、A．read B．forgot C．thought D．heard2、A．fighting B．trembling C．eating D．sleeping3、A．tried B．agreed C．promised D．regretted4、A．calmeddown B．stoodup C．rolledover D．runoff5、A．injured B．stolen C．lost D．rescued6、A．home B．past C．back D．on7、A．preparation B．explanation C．test D．search8、A．cautiously B．casually C．skillfully D．angrily9、A．surprise B．joy C．hesitation D．anxiety10、A．predicted B．advertised C．believed D．recorded11、A．house B．phone C．street D．car12、A．called B．copied C．counted D．remembered13、A．fed B．adopted C．found D．cured14、A．hunted B．skied C．lived D．worked15、A．onpurpose B．ontime C．inturn D．invain16、A．cares B．sees C．suffers D．learns17、A．place B．trouble C．waste D．extreme18、A．service B．plan C．effort D．team19、A．equal B．allergic C．grateful D．close20、A．suitable B．proud C．wise D．willing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）Cellphonescanbelife-savingcommunicationtoolstohaveonhandinavehicleincaseofemergency.1．,actuallyusingacellphonewhiledrivingmaybelifethreatening.Manydifferentstudieshaveshownthatwhendriversuseaphonewhiledriving,itcanbevery2．(danger).Atsomepointduringtheuseofacellphone,adriver’seyesaresuretobedistractedfromtheroad.Studieshaveshownthatnewdriversareespeciallylikely3．(have)anaccidentwhentheyuseacellphonewhiledriving.Thereasonforthisis4．newdrivershavelessexperienceinfocusing5．drivingduringdistractions.Also,severalstudies6．(do)onteendriversfoundthatmanyteenssendtext7．(message)whiledriving,whichisthoughttobemoredistractingandatrisk.Alldrivers,notjustteensorothernewdrivers,whouseacellphonewhiledriving8．(say)bystudiestobeatleastfourtimes9．(much)likelytobeatriskthandriverswhodon'tuseaphonebehindthewheel.Suchstudieshaveinspiredmanycountries,10．(include)theUnitedStates,tohaveatleastsomebansonhand-heldcellphoneusewhiledriving.However,manypeoplefeelthattheserestrictionsarenotenoughbecausestudieshavealsoshownthathand-heldcellphonesarejustapartoftheproblem.第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。短文中共有10处语言错误，每句中最多有两处。错误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(∧)，并在其下面写出该加的词。删除：把多余的词用斜线(＼)划掉。修改：在错的词下画一横线，并在该词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。Ihatetosaysorry，andthereisachangeinmyschoolarrangements．SoI’mafraidIwon’tabletokeepmyappointmenttodiscussChinesepaintingswithyou．Isincereapologizetoyouforanyinconveniencecausingbytheunexpectedchange．ThereforeIsuggestedweputitofffrom3pmthisweekenduntilthesametimeinnextThursday．Willthatbefineforyou?GoodnewsisthataexhibitionofChinesepaintingsaretobeheldthisweekend．Worksbymanynationwidefamouspainterwillbeincluded，amongwhoQiBaishiismostfamousinChina．AvisittherewillsurelyhelpyoubetterunderstandChinesepaintings．Lookingforwardtoyourearliestreply．第二节书面表达（满分25分）29．（25分）你校的体育节刚刚结束。请给学校英语报写一篇报道，报道体育节的主要活动、精彩瞬间及意义。注意1.词数100词左右；2.可以通当增加细节，使文连贯；3.报道的开头已为你写好，不入词数。参考词汇:开幕式openingceremony项目item___________________________________________________________________________________________________________________________________________________________________________________________________________

参考答案第一部分（共20小题，每小题1.5分，满分30分）1、B2、B3、B4、C5、D6、B7、A8、B9、D10、A11、D12、B13、B14、A15、C16、D17、A18、A19、C20、A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、C2、D3、C4、B22、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.Themajorproblemwiththespacetrashisthatitmayhitworkingsatellitesanddamagetravelingspacecraft(飞船).Moreover,piecesofjunkmaycollide（碰撞）witheachotherandbreakint