湖南省浏阳一中等湘东五校中学2025届高三下学期第六次检测英语试卷含解析

湖南省浏阳一中等湘东五校中学2025届高三下学期第六次检测英语试卷注意事项1．考生要认真填写考场号和座位序号。2．试题所有答案必须填涂或书写在答题卡上，在试卷上作答无效。第一部分必须用2B铅笔作答；第二部分必须用黑色字迹的签字笔作答。3．考试结束后，考生须将试卷和答题卡放在桌面上，待监考员收回。第一部分（共20小题，每小题1.5分，满分30分）1．Touristsarerequiredto_________localcustomsandmindtheirmannerswhentravellingabroad.A．spot B．confirmC．observe D．spread2．－Whatiftherainstormcontinues?－Comeonguys!Wehavetomeetthe_______whatevertheweather.A．standard B．demandC．deadline D．satisfaction3．Noonebelieveshisreasonsforbeinglatethathewascaughtinatrafficjam,_______madehimembarrassed.A．it B．which C．that D．why4．—Whyareyousoupset?—Ihadmycomputerrepairedyesterday,butit________workagain.A．doesn’t B．didn’tC．won’t D．wouldn’t5．Aftersevenhours’drive,theyreached______theythoughtwastheplacetheyhadbeendreamingof.A．that B．whatC．where D．which6．—Listeningtolanguagerecordinginbedseemslikeaneasywayto_______somenewvocabulary.—Butdoesthislearningmethodactuallywork?A．polishupB．makeupC．pickupD．buildup7．—You’vemadegreatprogressinyourEnglishstudy,haven’tyou?—Yes,butmuch.A．remainstodo B．isremainedtodoC．remainstobedone D．isremainedtobedone8．ThepredictionfromMayaworriesresidents_______December21,2012wouldbetheendoftheworld.A．if B．that C．whether D．which9．_______theweather,thesportsmeetwillbeheldontime.A．Insteadof B．Inrelationto C．Regardlessof D．Infavorof10．Iguess________impressesmemostabouthispaintingisthecolorsheuses.A．who B．whichC．that D．what11．________iswillingtovolunteerinthe2022BeijingWinterOlympicsiswelcometojoinus.A．WhateverB．WhoeverC．WheneverD．Wherever12．WhenIsaidsomeonebroketheschoolregulations,I______you.Whydidyougetthatangry?A．don’treferto B．haven’treferredto C．wasn’treferringto D．hadn’treferredto13．---Let'swalktothatvillagetogether.---__________.Howcanwetwogirlsdothatinthedark？A．Iagreewithyou. B．That'sagoodpoint.C．Youmustbejoking！ D．That'snotyouropinion！14．I'mcallingtoenquireabouttheposition__________inyesterday'sChinaDaily.A．advertised B．tobeadvertised C．advertising D．havingadvertised15．Eggs,meat,vegetablesandotherfoodscaneasilybepoisonedbymicroorganismssuchas______.A．phenomena B．dilemma C．diploma D．bacteria16．Theaimofthegovernmentistomakeeverycitizenbetteroff,____,tohelpthemliveahappylife．A．asaresult B．forastartC．foronething D．inotherwords17．Mostofthemoneyforthereconstructionofthequake-strickentownhasbeenallocatedbythegovernment,therest______fromthecomingcharityconcerts.A．tobecollected B．havingbeencollectedC．beingcollected D．tohavebeencollected18．Anoldladycametothebusstoponlythebushadgone.A．torun;tofind B．running;tofind C．andran;finding D．running;finding19．Ifithadnotbeenfortheheroes’contributionsandsacrifices,we_____suchahappylife.A．wouldn’thaveled B．wouldn’tbeleadingC．haven’tled D．arenotleading20．---Whereisyournewhomenow?---Inthenewdevelopedzone.ButI______downtownforfiveyears.A．lived B．hadlivedC．havelived D．wasliving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）Afewmonthsago,IdecidedthatIwasgoingtotreatmyselftoa4-daygetawayfromLosAngelesandvisitChicago.Igotafreeairplaneticket,buthadtopaythehotelincash,whichIreallycouldn’tafford.Ifoundatravelwebsitewhereadiscounted3-nightstaywaspurchasedfromarecentlyopenedhotel.Aboutthreeweeksbeforethetrip,IhadtoregretfullycancelandonlythendidIrealizetheroom,whiletransferabletoanotherperson,couldn’tbechangedtoalaterdateandwasn’trefundable.ForthenexttwoweeksItriedsellingitonCraig’slistwithnosuccess.Fivedaysbeforethe“bigweekend”,IgaveuptryingtogetanymoneybackanddecidedI’dcontactsomeacquaintanceswholiveinChicagoandoffersomeoneafree“staycation”.Aftertryingahandfulofpeople,allofwhomalreadyhadtheirownplans,Iwasdeterminedtohavetheroomnotgotowaste.That’swhenitsuddenlyoccurredtomethatIwaslookingattheroomsinthewrongway.Insteadofviewingthemforvacationpurposes,surelytheremustbeawaytoputthemtogooduse,andthatwaswhentheideathatsomesortofsheltermightbeabletouseithitme.Ieventuallyfoundonewhosefocusisaidingvictimsofdomesticviolence.Thisparticularonewaswillingtolistentomyout-of-left-fieldstoryandmadeiteasiertotransfertherooms.Theshelterwasworkingwithadesperatewomanandherdaughter,whowerefortunatelyabletomakeuseoftheroom.Iwaslatertoldbytheshelter“theyhadablast”.1、Wecanlearnfromparagraph1thattheauthor______.A．hadatightbudgetforhisholidayB．boughthisflightticketusingcashC．plannedtogoonbusinessinChicagoD．ordereda4-daygetawayfromawebsite2、Whatwastheauthor’sfirstchoicewhenherealizedthesituation?A．Makingthetriphimself.B．Doingafavortoafriend.C．Complainingtotheauthority.D．Gettinghismoneyback.3、Whatdidtheauthorfinallydowithhisroomreservation?A．Hesoldittosomeoneonvacation.B．Hedonatedittoneedystrangers.C．Heputitofftoalaterholidaytime.D．Heuseditfordomesticviolence.4、Fromtheunderlinedsentenceinthelastparagraph,wecaninferthat______.A．theauthorwasunhappywiththeresultB．theprogramwasshockedbytheeventC．thewomenweregratefulfortheroomD．theshelterwasaskingformorerooms5、Whatdoyouthinkoftheauthor?A．Richandconsiderate.B．Fortunateandhumorous.C．Kind-heartedanddetermined.D．Modestandoptimistic.22．（8分）Inthird-worldcountriessuchasSwazilandandHaiti,a$15-dollarinventionismakingaworldofdifference.Nokero,acompanystartedbyBrianRants,sellslampsthatdonotrequirekerosene(蓖麻油).Thesesolarlampshavebecomeastaple(主流产品)incountriesinAfrica,toprovidelightforreadingandsafetyatnight.Nokcrohassoldover500,000lampsinover120countriessinceitwasfirstfoundedin2010andRantsthinksthedemandforhisproductwillonlycontinuetoincrease.Mostlampsfoundinthird-worldcountriescurrentlyrequirekerosenetorun.butkerosenecausesindoorpollutionandhasbeenlinkedtofiresthathavecausedoveramilliondeaths.Insteadofexperiencingtheeffectsofsmoking40cigarettesadayfromkerosenelamps,Rantsthinkshissolarlampscouldbetheanswerforthird-worldcountries.TheEconomistagrees,callingsolarlights“thenextbiginnovationfortheworld’spoor”.Nokero’ssolarlampsarehigherinqualityandlessexpensivethanalotofsolartechnology,makingthemapracticaloptionformanypeopleinthirdworldcountries.Ratherthangivingsolarlampstoindividualsinneed.Nokero’smissionistomakethemaffordable.ThroughresearchRantshasrealizedthatindividualswhobuyasolarproducttakebettercareofitandvalueitmorethaniftheyhadreceiveditforfree.FamilieswhobuyNokero’ssolarlampsmakeupthecostinjustafewmonthsofnothavingtobuykeroseneorpayforoff-the-gridelectricity.SomeactivistshaveattackedcompaniessuchasNokeroforsellingproductstothepoorratherthansimplygivingthemoutforfree.Theyarguethatthesecompaniesunfairlyprofitoffthepoor.However,Rantsdisagrees.Familiesreceiveaproductthatismuchhigherinqualitythanwhattheymightreceiveforfreeandfeelasenseofownershiphavingpurchaseditforthemselves.1、Whatdoweknowaboutthesolarlampsinthepassage?A．Theysaveenergyandcausenopollution.B．Theyequaltheeffectof40cigarettesaday.C．Theyaregiventotheindividualsfreeofcharge.D．Theyhelptosavekeroseneinthird-worldcountries.2、AccordingtoRants,ifthepoorarcgiventhelampsforfree,they.A．willhavetopayforkeroseneorelectricityB．willnottakegoodcareorvaluethelampsC．willfeelasenseofownershipofthelampsD．won’thelptoincreasethesalesofthelamps3、Whatisparagraph3mainlyabout?A．Aninnovationoftheworld.B．Advantagesofthesolarlights.C．Solutiontoworld’spovertyproblems.D．Heavypollutioncausedbykerosenelamps.4、WhichworddescribesBrianRants?A．Honest.B．Thoughtful.C．Charitable.D．Greedy.23．（8分）Untilrecently,voicecloning—orvoicebanking,asitwasthenknown—wasacustomizedindustrywhichservedthoseatriskoflosingthepowerofspeechtocancerorsurgery.Synthesizing（合成）avoicewasalongandexpensiveprocess.Itmeantrecordingmanyphrases,eachspokenmanytimes,withdifferentthehistoryoftheKidPassblogemotionalemphase（s重音）andindifferentcontexts(statement,question,commandandsoforth),inordertothetipsonwritinggoodarticlesonlinecoverallpossiblepronunciations.Notanymore.Softwareexiststhatcanstorepiecesofrecordedspeechwhichismerelyfivemillisecondslong,eachmarkedwithaprecisepitch（音高）.Thesecanbeputtogethertomakenewwords,andadjustedindividuallysothattheyfitharmoniouslyintotheirnewsonichomes.Thisismuchcheaperthanconventionalvoicebanking,andpermitsnovelusestobedeveloped.ThisyearVivoTextplanstoreleaseanappthatletsusersselecttheemphasis,speedandlevelofhappinessorsadnesswithwhichindividualwordsandphrasesareproduced.Mr.Silbertreferstotheemotivequalityofthehumanvoiceas“theultimateinstrument”.Yetthispoweralsotroubleshim.VivoTextlicensesitssoftwaretoHasbro,anAmericantoymakerkeentosellincreasinglyinteractiveplaythings.Hasbroisaware,Mr.Silbertnotes,thatwithoutsafeguardsanaughtychildmight,forexample,typeimpolitewordsonhismother’ssmartphoneinordertoseeayoungersiblingburstintotearsonhearingthemspokenbyatoyusingmum’svoice.Moretroubling,whentestedagainstvoice-biometricssoftwarelikethatusedbymanybankstoblockunauthorizedaccesstoaccounts,morethan80%ofthefakevoicestrickedthecomputer.AlanBlack,oneofFestvox’sdevelopers,thinkssystemsthatrelyonvoice-IDsoftwarearenow“deeply,fundamentallyinsecure”.Dr.Saxenaandhiscolleaguesaskedvolunteersifavoicesamplebelongedtoapersonwhoserealspeechtheyhadjustlistenedtoforabout90seconds.Thevolunteersrecognizedclonedspeechassuchonlyhalfthetime(ie,nobetterthanchance).Theoutcome,accordingtoGeorgePapcun,anexpertwitnesspaidtodetectfakerecordingsproducedasevidenceincourt,istheappearanceofatechnologywith“enormouspotentialvaluefordisinformation”.Asmightbeexpected,countermeasurestorecognizesuchdeception（欺骗）arebeingdeveloped.NuanceCommunications,amakerofvoice-activatedsoftware,isworkingonalgorithms（算法）thatdetecttinyskipsinfrequencyatthepointswhereslicesofspeecharestucktogether.Adobe,bestknownasthemarkerofPhotoshop,animage-editingsoftwaresuite,saysthatitmayadddigitalwatermarkstospeechsynthesizedbyavoice-cloningsoftwarecalledVoCoitisdeveloping.Suchtechnologymayhelpcomputersrecognizesuspiciousspeech.Evenso,itiseasytoimaginethechaosthatmightbecreatedinaworldwhichmakesiteasytoputauthentic-soundingwordsintothemouthsofopponents—betheycolleaguesorheadsofstate.1、Paragraphs1and2aremainlyabout.A．significantelementsinfluencingvoicecloningB．possibleapplicationsofvoicecloninginrealityC．complexitiesofcreatingasyntheticcopyofavoiceD．differencesbetweentraditionalandexistingvoicebanking2、What’sHasbro’sattitudetowardsVivoTest’snewapp?A．Optimistic.B．Conservative.C．Unconcerned.D．Subjective.3、TheexperimentcarriedoutbyDr.Saxenaandhiscolleaguesshowsthatvolunteers.A．identifiedclonedspeechinabout45secondsB．preferredarealspeechtoavoicesampleC．provedonlyalittlehardertofoolthansoftwareD．foundithardtousethesoftwaretorecordtheirvoices4、Whatcanweinferfromthelastparagraph?A．Investmentsshouldbeincreasedtoadvancevoicecloning.B．Long-termmeasuresshouldbetakentopopularizetheideaofvoicecloning.C．Disagreementsamongfirmsaboutthewaytotreatvoicecloningaregettingserious.D．Problemsofvoicecloningareunavoidabledespitetheeffortsthathavebeenmade.24．（8分）Onacoolmorning,WilsonKasaineheadsoutalongadirtpathinsouthernKenya.Hiscalmnessmakesiteasytoforgetthathe’strackingoneofthemostdangerousanimalsintheworld.Kasaineistrackinglions—especiallyonelioncalledMarti,whoisthereal-lifeLionKingofSelenkayConservancy.Trackinglionsonfootmaysoundlikeadeathwish,butKasainehasbeendoingitformostofhislife.BornintoatraditionalMaasaifamilyhequicklygrewtounderstandthebeautyanddangerofwildlife.Livingwithbigwildanimalsforceshimtodevelopagoodsenseofwheretheyhavebeenandwheretheymaybegoing.Duringhis12-kilometerwalkstoandfromschool,helearnedhowtotellthepawprints(爪印)ofalionfromthoseofotheranimals.Growingup,Kasaineknewthatimprovinghistrackingabilitieswouldhelphimavoidsurprisemeetingswithdangerousanimals.FormanyMaasai,trackingismainlyamatterofself-protection.ButKasaineistrackinglionstomeetthemandtoprotectthem.Heleadsasmallgroupofwide-eyedtouristsovertheredsandypath,searchingforthelionthathasleftuponithisprints.Eachyear,thousandsoftouristscrowdKenya’snationalparkstotrytohavealookatthe＂bigfive＂;elephants,rhinoceros,leopards,buffaloesandlions.Theinternationaldrawoftheseanimalsmattersalotbecausethenation’seconomyistiedtotheprotectionofitswildlife.IfKenya’swildlifedisappears,sodoesitssecond-largestsourceofincome.WildlifeprotectioneffortsinKenyameantmarkingofflandexclusively(专门地)foranimals.Butitalsomeantthatthepeoplewhohadoriginallylivedintheareawereforcedtoleavetheirlandandintosmallersurroundingareas.TheyarealsofindingitincreasinglyhardtokeepatraditionalMaasailifestyle.Butpeoplearegladthatitreallymakesadifferencetowildlifeprotection.1、HowdidKasainetracklions?A．Byworkingtogetherwithtourists.B．Byrunningafterthemallthetime.C．Bygoingtoschooleveryday.D．Bystudyingtheirpawprints.2、WhatcanwelearnfromParagraph4?A．Maasaipeoplearebornanimallovers.B．TourismisabigthreattoKenya’swildlife.C．Kenyabenefitsalotfromitswildlifeprotection.D．Smallanimalsarenotincludedintheirprotectionpolicy.3、Whatdoestheunderlinedword＂it＂inthelastparagraphreferto?A．Kenya’seconomicdevelopment.B．People’sleavingtheiroriginalhomes.C．Kenya’ssecond-largestincomesource.D．Kenyanpeople’straditionalMaasailifestyle.4、Whatisthebesttitleforthetext?A．WildlifeprotectioninKenyaB．MeetingadangerousanimalC．WilsonKasaine’swisechoiceD．Learningtolivewithlions25．（10分）Travelisoneofthemostexcitingexperiencesahumanbeingcanhave.ImaginehowItaliantravelerMarcoPolomusthavefeltwhenhefoundhimselfonChinesesoil,seeingawayoflifequitedifferentfromanythinghe’dseenbefore.AndhowmarvelousmustithavebeentolistentoZhangQianwhenhereturnedtoChinafromhisjourneythroughCentralAsiaandWestAsia?Hisbrainmusthavebeenpackedwitheverythinghe’dseenandheard,leadingtothefoundingoftheSilkRoad.Somepeoplehavetraveledallovertheworld,andtravelisawayoflifetothem.Theyperhapsknowwhattoexpectbeforetheytravel.That’swhythebesttraveliswhenit’sforthefirsttime.ImagineapersonwhohasalwayswantedtotraveltotheUnitedStates.Ofcourse,they’veprobablyseentheStatueofLibertyathousandtimesonTV,andtheWhiteHouse,andalltheotherfamoussights.Butnoneofthatwouldcomparetothethrilloflookingoutofthecabinwindowastheplanelands,watchingthecitiesandstreetsoftherealAmericacomeintoview.Althoughtravelisoftenjustforrecreation,it’salsoeducational.Wemaynotknowthatwearegettinganeducation,butwestillare.We’relearningeveryday:newwordsinanewlanguage,newpeople,andnewwaysoflife.Butthislearningtakesplaceintheschooloftheworld,nottheclassroom.Oneofthelessonswelearnisundoubtedlyamoralone.Aswegettoknowforeignplaces,wecometounderstandthattherearemanydifferentwaystolive,andthatthewayweliveisn’tnecessarilythebestway.TheBritishpoliticianBenjaminDisraelisummedthisupwellwhenhesaid,“Travelteachestoleration.”1、TheauthorusesMarcoPoloandZhangQianasexamplesto.A．explainhowtheSilkRoadwasfoundedB．presenttravelasanamazingexperienceC．showhowthewaypeopletravelhaschangedD．describeimportantculturalexchangesinhistory2、Bysaying“thebesttraveliswhenit’sforthefirsttime”,theauthormeansthat.A．one’sfirsttripisusuallythemostchallengingB．noothertripisbetterthanone’sfirsttripC．thereisalwaysmuchtolearnonone’sfirsttripD．peopleusuallymakebetterpreparationsfortheirfirsttrip3、Theunderlinedwordinparagraph4probablymeans.A．learningB．knowledgeC．funD．risk4、Accordingtothelasttwoparagraphs,theauthorbelievesthat.A．travelingshouldbeincludedinformaleducationB．travelingimprovespeople’sconfidenceintheirlifestyleC．aforeignjourneymayraisepeople’sculturalunderstandingD．thereismoretolearnfromadventuresthanbeinginclassroom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）IwaswalkingaroundinaBigBazarstoredoinga1,whenIsawa

Cashiertalkingtoaboy.TheCashiersaid,“I’msorry,butyoudon’thaveenough2tobuythisdoll.”Thenthelittleboy3meandasked,“Uncle,areyousureIdon’thaveenoughmoney?”Icountedhiscashand4,“youdon’t,mydear.”Thelittleboywasstill5thedollinhishand.Finally,Iwalked6himandIaskedhimwhohewishedtogivethisdollto.“Iwantedto7mysisterforherBirthday.Ihavetogivethedolltomymommy8shecangiveittomysisterwhenshegoesthere.”Hiseyeswereso9whilesayingthis.“MySisterhas10.DaddysaysMommyisgoingtoseeGodtoo,soI11thatshecouldtakethedollwithhertogiveittomysister.”Thenhe12againatthedoll,veryquietly.Iquicklyreachedformy13andsaid.“Supposewe14again,justincaseyoudohaveenoughmoneyforthedoll?”Henodded.I15someofmymoneytohis,withouthimseeingandwestartedto16it.Therewasenoughforthedollandevensome17money.Helookedatmeandsaid,“Iaskedlastnightfor18tomakesureIhadenoughmoney.He19me!Ialsowantedtohaveenoughmoneytobuyawhiteroseformymommy,butIdidn’t20toaskGodfortoomuch.ButHegavemeenoughtobuythedollandawhiterose.Mymommyloveswhiteroses.”1、A．hidingB．washingC．cookingD．shopping2、A．moneyB．currencyC．treasureD．wealth3、A．turnedoffB．turneddownC．turnedtoD．turnedover4、A．askedB．wentC．reviewedD．replied5、A．owningB．supportingC．holdingD．saving6、A．towardB．awayC．inD．out7、A．buyB．makeC．giftD．donate8、A．suchthatB．sothatC．somanyD．sofar9、A．sadB．happyC．thrilledD．satisfied10、A．missedB．enjoyedC．sleptD．gone11、A．thoughtB．suggestedC．insistedD．predicted12、A．heardB．lookedC．recalledD．found13、A．bagB．homeC．walletD．car14、A．witnessB．checkC．knowD．forgive15、A．savedB．borrowedC．keptD．added16、A．countB．cookC．shareD．work17、A．freshB．fakeC．spareD．broken18、A．dadB．myselfC．mumD．God19、A．smiledB．heardC．noticedD．discussed20、A．likeB．dareC．bearD．have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）DearSir,Inreply1．youradvertisementintoday’sChinaDailyregardingavacancy(空缺)inyouroffice,Iwishtoapplyforthepositionofseniorclerk,2．youhavespecified．IfeelsurethatIcanmeetyourspecialrequirementsthatthecandidate(应试者)musthave3．highcommandofEnglish,forI4．(graduate)fromtheEnglishLanguageDepartmentofWuhanUniversitythreeyearsago．InadditiontomystudyofEnglishintheuniversity,Ihaveworkedforthree5．(year)asasecretaryinthefirmofABCTradingCo.Ltd．Themainreasonfor6．(change)myemploymentistogainmoreexperiencewithasuperiortradingcompanylike7．(you)．Ibelievethatmyeducationandexperiencewillprove8．(use)forworkinyouroffice．Iamenclosingmyresume,certificateofgraduationandaletterofrecommendationfromthepresidentoftheuniversity．Ishallbegrateful9．youwillgivemeapersonalinterviewatyour10．(convenient)．Verytrulyyours,LiMei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作文，请你修改你同桌写的以下短文。短文中共有10处错误，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（∧），并在此符号下面写出该加的词。删除：把多余的词用斜线（＼）划掉。修改：在错的词下划一横线，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。Itwaslatewhenwelefttherestaurant、WehavealreadycrossedalongbridgewhenIdiscoveredIhadleftmypurseattherestaurant、Itwasnothingwecoulddobuttoturnaround、Therewasnochancewecouldreturntotherestaurantbeforetheclosingtime、Thenwerememberedafriendofourswholivedsixblockfromarestaurant、Helistenedtoourstorycarefullybutthenhepromisedhewouldrunovertotherestaurant,thatmypursehadbeenleft、Finally,werecoveredthepurse、Ourfriendsoundeddelightedlytohavebeenapartofthislittleadventure、Besidefindingthelostpurse,Ialsohadasenseofgreathappiness、第二节书面表达（满分25分）29．（25分）假定你是李华，近日搭乘某国际航班回国，旅途的糟糕经历令你很不愉快。现请用英文给该航空公司写一封投诉信。要点包括：1．陈述写信原因；2．投诉内容：航班延误、服务不周到等。3．提出你的要求。注意：1.词数100左右；2.可以适当增加细节，以使行文连贯。DearSirorMadam,____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Sincerely,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、C3