2026年大学英语四级真题试卷及完整参考答案

2026年大学英语四级真题试卷及完整参考答案一、写作（Writing，106.5分，30分钟）1.Directions:Forthispart,youareallowed30minutestowriteanessaytitledTheImportanceofLifelongLearning.Youshouldwriteatleast120wordsbutnomorethan180words.答案(参考范文)Inaneraofrapidtechnologicalandsocialchange,theimportanceoflifelonglearningcannotbeoveremphasized.Ithasbecomeanecessityratherthanaluxury.Firstandforemost,lifelonglearningenablesindividualstoremaincompetitiveinthejobmarket.Asindustriestransformandnewtechnologiesemerge,thosewhocontinuetoacquirenewskillsaremorelikelytoadaptandsucceed.Inaddition,lifelonglearningenrichespersonaldevelopment.Itbroadensone'shorizons,cultivatescriticalthinking,andenhancesthequalityoflife.Furthermore,fromasocietalperspective,apopulationcommittedtocontinuouslearningdrivesinnovationandeconomicprogress.Inconclusion,lifelonglearningisessentialinthemodernworld.Itnotonlyhelpsuskeeppacewiththetimesbutalsoempowersustoleadmorefulfillinglives.Therefore,everyoneshouldembracelearningasalifelongjourney.二、听力理解（ListeningComprehension，248.5分，25分钟）SectionA短篇新闻（NewsReports，共7题，每题7.1分）说明：以下题目依据新闻听力真题格式命制。实际考试中先播放三篇新闻，每篇后有2—3道题。NewsReportOneQuestions1and2arebasedonthenewsreportyouhavejustheard.1.Whatisthemaincauseoftheflightdelaysattheairport?A.Heavysnowstormsintheregion.B.Atechnicalfailureinthecontroltower.C.Ashortageofgroundstaff.D.Anunexpectedstrikebyairlineworkers.答案A解析新闻开头提到"aseveresnowstormforcedtheairporttosuspendoperations"，说明航班延误的主要原因是暴风雪，故选A。2.Whatmeasurehastheairporttakentodealwiththesituation?A.Ithascancelledallflightsfortwodays.B.Ithasaskedpassengerstostayatnearbyhotels.C.Ithasdeployedadditionalsnow-clearingequipment.D.Ithastemporarilyclosedoneofitsrunways.答案C解析新闻中提到"theairporthasdeployedadditionalsnow-clearingequipment"以及"crewsareworkingaroundtheclock"，故C为正确选项。NewsReportTwoQuestions3and4arebasedonthenewsreportyouhavejustheard.3.Whatachievementhasthelocallibraryrecentlymade?A.Itbecamethelargestlibraryinthestate.B.Itcompletedayear-rounddigitalrenovation.C.Itwasrenamedafterafamouswriter.D.Itreceivedarecordnumberofvisitorslastmonth.答案B解析新闻明确指出"Thelibrarycompleteditsyear-rounddigitalrenovation"（完成全面数字化改造），这是它最近取得的成就。4.Whatservicedoesthelibrarynowoffertoresidents?A.Freedeliveryofbookstohomeboundreaders.B.Freeprintingandcopyingforstudents.C.Onlineaccesstorarebookcollections.D.Eveningreadingprogramsforchildren.答案A解析新闻后半段提到"anewservicethatdeliversbooksfreeofchargetoresidentsunabletovisitthelibrary"，即免费送书上门服务，对应A。NewsReportThreeQuestions5to7arebasedonthenewsreportyouhavejustheard.5.Whatdidresearchersdiscoverabouttheancientcity?A.Ithadbeendestroyedbyanearthquake.B.Itwasbuiltontopofanoldersettlement.C.Itpossessedahighlyadvancedwatersystem.D.Itservedasthecapitalofapowerfulempire.答案C解析新闻中提到"researchersuncoveredevidenceofahighlyadvancedwatersystem,includingchannels,pipes,andreservoirs"，故选C。6.Whatsurprisedtheresearchteammostaboutthediscovery?A.Thecitywasmuchlargerthanpreviouslythought.B.Thewatersystemwasmorecomplexthanexpected.C.Thecityhadsurvivedseveralmajorfloods.D.Thewaterpipesweremadeofararematerial.答案B解析新闻中说"whatsurprisedtheteammostwasthecomplexityofthewatersystem"——最让团队惊讶的是水系统的复杂程度，故选B。7.Whatdoresearchersplantodonext?A.Restorethewatersystemforpublicdisplay.B.Searchforsimilarcitiesinnearbyregions.C.Usedigitaltechnologytorebuildthecitymodel.D.Publishadetailedreportoftheirfindings.答案C解析新闻结尾说"theteamplanstousedigitaltechnologytocreateafullthree-dimensionalmodelofthecity"，故选C。SectionB长对话（LongConversations，共8题，每题7.1分）ConversationOneQuestions8to11arebasedontheconversationyouhavejustheard.8.Whydoesthewomanwanttochangehermajor?A.Shefailedseveralcoursesinhercurrentmajor.B.Shehaslostinterestinhercurrentstudies.C.Herparentsurgedhertostudybusiness.D.Shewantstograduateearlier.答案B解析对话中女士说"Ijustdon'tfindcomputerscienceinterestinganymore"（不再对计算机科学感兴趣），说明她换专业的原因是兴趣减退。9.Whatdoesthemansuggestthewomandofirst?A.Consultthedepartmentchair.B.Talktoheracademicadvisor.C.Attendsomemarketingclasses.D.Finishthecurrentsemester.答案B解析男士建议"youshouldscheduleameetingwithyouracademicadvisortodiscussyouroptions"，即先与学业导师沟通，故选B。10.Whatconcerndoesthewomanmentionaboutchangingmajors?A.Itmaydelayhergraduation.B.Itmaycostextratuition.C.Itmayaffectherscholarship.D.Itmayrequireadditionalexams.答案A解析女士担心"changingmajorsmightdelaymygraduationbyatleastayear"，故选A。11.Whatdoesthemanfinallyrecommendthatthewomando?A.Takeamarketingcourseasanelective.B.Transfertoanotheruniversity.C.Keepheroriginalmajor.D.Applyforaninternshipinmarketing.答案A解析男士最后建议"whynottakeamarketingcourseasanelectivethissemesterandseehowyoulikeit"，故选A。ConversationTwoQuestions12to15arebasedontheconversationyouhavejustheard.12.Whatistheconversationmainlyabout?A.Howtoapplyforalibrarycard.B.Howtoconductacademicresearch.C.Howtochoosearesearchtopic.D.Howtousetheuniversitydatabase.答案B解析对话围绕如何查找文献、使用数据库、规划论文写作展开，核心话题是如何进行学术研究，故选B。13.Whatdoesthelibrarianrecommendfirstforfindingacademicsources?A.GoogleScholar.B.Thelibrary'sonlinedatabases.C.Theuniversity'sopen-accessrepository.D.Printedjournalsinthereferenceroom.答案B解析图书管理员说"yourfirststopshouldbethelibrary'sonlinedatabases"，即首先使用图书馆在线数据库，故选B。14.Whatdoesthelibrariansayaboutthe"citedreferencesearch"?A.Ithelpslocatearticlesthathavecitedaknownpaper.B.Itisonlyavailabletograduatestudents.C.Itismoreeffectivethanakeywordsearch.D.Itrequiresspecialtrainingtouse.答案A解析图书管理员解释citedreferencesearch是"awaytofindnewerarticlesthathavecitedanolder,relevantpaper"，即通过引文追踪找到更新的文献，故选A。15.Whatdoesthelibrariansuggestattheendoftheconversation?A.Makingaresearchappointment.B.Downloadingacitationmanagementtool.C.Joiningastudygroup.D.Visitingthewritingcenter.答案D解析对话结尾图书管理员建议学生"ifyouneedhelpwithwriting,don'tforgettheuniversitywritingcenteroffersfreeconsultations"，故选D。SectionC听力篇章（Passages，共10题，每题7.1分）PassageOneQuestions16to18arebasedonthepassageyouhavejustheard.16.Whatisthespeakermainlytalkingabout?A.ThehistoryoftheGreatBarrierReef.B.Theimpactofclimatechangeoncoralreefs.C.Theeconomicvalueofmarineecosystems.D.Themethodsusedtoprotectcoralreefs.答案B解析短文通篇讲述气候变化导致海水升温、珊瑚白化、生态系统退化，核心主题是气候变化对珊瑚礁的影响。17.Whathappenstocoralswhenseatemperaturesrise?A.Theygrowatafasterrate.B.Theylosethealgaelivingintheirtissues.C.Theymovetodeeperwater.D.Theyproducemorecalciumcarbonate.答案B解析短文中提到"risingseatemperaturescausecoralstoexpelthealgaelivingintheirtissues,leadingtoaprocessknownasbleaching"——珊瑚会排出体内的藻类，发生白化，故选B。18.Whatisoneofthemeasuresmentionedtoprotectcoralreefs?A.Reducingcarbonemissions.B.Banningfishinginreefareas.C.Establishingmarineprotectedareas.D.Transplantingcoralstocoolerregions.答案C解析短文结尾提到"establishingmarineprotectedareashasproveneffectiveinhelpingcoralreefsrecover"，故选C。PassageTwoQuestions19to21arebasedonthepassageyouhavejustheard.19.Whatdidthestudyfindaboutpeoplewhowalkregularly?A.Theyarelesslikelytosufferfromheartdisease.B.Theyreporthigherlevelsofhappiness.C.Theysleepbetteratnight.D.Theyhavebettermemoriesinoldage.答案B解析短文中说"thestudyfoundthatpeoplewhowalkedregularlyreportedsignificantlyhigherlevelsofhappinessandlowerlevelsofstress"——经常散步的人幸福感更高，故选B。20.Howlongshouldpeoplewalkeachdayaccordingtotheresearchers?A.Atleast15minutes.B.Atleast30minutes.C.Atleast45minutes.D.Atleast60minutes.答案B解析短文中明确提到"theresearchersrecommendatleast30minutesofwalkingperday"。21.Whatisthespeaker'sattitudetowardwalking?A.Skeptical.B.Indifferent.C.Enthusiastic.D.Critical.答案C解析短文结尾处说话人表示"walkingisoneofthesimplest,mostaccessibleformsofexercise,andIstronglyencourageeveryonetomakeitpartoftheirdailyroutine"，语气积极热情，故选C。PassageThreeQuestions22to25arebasedonthepassageyouhavejustheard.22.Whatwasthepurposeofthestudyconductedbytheuniversity?A.Toexaminetheeffectsofsleeponacademicperformance.B.Tocompareonlinelearningwithclassroomlearning.C.Tomeasurestudents'satisfactionwiththeircourses.D.Toinvestigatetherelationshipbetweendietandconcentration.答案A解析短文开头说thestudy"aimedtoexaminehowsleeppatternsaffectstudents'academicperformance"，即研究睡眠对学业成绩的影响。23.Whatdidtheresearchersfindaboutstudentswhosleptlessthansevenhours?A.Theyscoredslightlyhigheronexams.B.Theyshowedmoreinterestingroupwork.C.Theyperformedworseinmemory-basedtests.D.Theyweremorelikelytoskipmorningclasses.答案C解析短文提到"studentswhosleptfewerthansevenhoursperformedsignificantlyworseonmemory-basedtests"——睡眠不足的学生在记忆类测试中表现更差，故选C。24.Accordingtothepassage,whatisagoodwaytoimprovesleepquality?A.Exercisinglateintheevening.B.Drinkingwarmmilkbeforebed.C.Keepingaregularsleepschedule.D.Usingelectronicdeviceslessduringtheday.答案C解析短文建议"maintainingaconsistentsleepschedule—goingtobedandwakingupatthesametimeeveryday—isoneofthemosteffectivewaystoimprovesleepquality"，故选C。25.Whatdoesthespeakersuggestuniversitiesshoulddo?A.Offermoreflexiblecourseschedules.B.Providesleepeducationprograms.C.Delaythestartofmorningclasses.D.Reducetheamountofhomework.答案B解析说话人在结尾建议"universitiesshouldconsiderprovidingsleepeducationprogramstohelpstudentsunderstandtheimportanceofsleep"，故选B。三、阅读理解（ReadingComprehension，248.5分，40分钟）SectionA选词填空（BankedCloze，共10题，每题3.55分）Directions:Fillintheblankswiththewordsgivenbelow.Youmaynotuseanywordmorethanonce.Questions26to35arebasedonthefollowingpassage.Urbangreenspaces,suchasparksandcommunitygardens,aremorethanjustpleasantadditionstoacity'slandscape.Theyplayacrucialroleinimprovingthequalityofurbanlife.Studieshaveshownthataccesstogreenspacescanreducestress,improvementalhealth,andencouragephysicalactivity.In26,greenareashelptolowerairtemperaturesincities,aphenomenonknownasthe"urbanheatisland"effect.Treesandplantsprovideshadeandreleasemoistureintotheairthrough27.Furthermore,thesespacesserveasimportant28forlocalwildlife,supportingbiodiversitywithinurbanenvironments.Despitethesebenefits,manycitiesstillfacea29ofgreenspace.Rapidurbanizationandpopulationgrowthhaveledtothe30ofparksandgardenstomakeroomforbuildingsandroads.Insomeneighborhoods,particularlythosewithlowerincomes,greenspacesare31scarce.Thisinequalityinaccesstonaturehasbeenlinkedto32healthoutcomesamongdisadvantagedgroups.Toaddressthisissue,cityplannersareincreasingly33greeninfrastructureintodevelopmentprojects.Greenroofs,verticalgardens,andpocketparksarebecomingmorecommonindenseurbanareas.Thesecreative34notonlybeautifythecitybutalsoprovidemanyofthesamebenefitsastraditionalparks.Asmorecitiesadoptsuchmeasures,thedreamofagreener,healthierurbanfutureseems35withinreach.A.shortageB.evaporationC.habitatsD.solutionsE.increasinglyF.incorporatingG.additionH.poorerI.conversionJ.remarkablyK.occasionallyL.preservedM.appealingN.expandingO.declining26.答案：G（inaddition）27.答案：B（evaporation）28.答案：C（habitats）29.答案：A（shortage）30.答案：I（conversion）31.答案：E（increasingly）32.答案：H（poorer）33.答案：F（incorporating）34.答案：D（solutions）35.答案：J（remarkably）解析本题要求根据上下文语义和词性选择正确单词。第26题考查固定搭配inaddition（此外）；第27题需要名词，指植物通过蒸腾作用释放水分，选evaporation；第28题需复数名词，栖息地选habitats；第29题ashortageof为"……短缺"；第30题指绿地向建筑用地的转化，选conversion；第31题需副词修饰scarce，选increasingly；第32题比较级修饰healthoutcomes，poorerhealthoutcomes即"较差的健康结果"；第33题beincreasinglyincorporating为现在进行时；第34题creativesolutions意为"创造性的解决方案"；第35题需副词修饰withinreach，选remarkably。SectionB长篇阅读匹配（LongReadingMatching，共10题，每题7.1分）Directions:Readthefollowingpassageandmatcheachstatement(Questions36—45)withthecorrectparagraph(A—I).Eachparagraphmaybematchedmorethanonce.TheRiseofOnlineLearningA.Onlineeducationhasexperiencedexplosivegrowthoverthepastdecade.Whatonceseemedlikeamarginalalternativetotraditionalclassroominstructionhasnowbecomeamainstreamchoiceformillionsoflearnersworldwide.TheCOVID-19pandemicacceleratedthistrenddramatically,forcingschools,universities,andtraininginstitutionstomovetheircoursesonlinealmostovernight.B.Oneofthemostobviousadvantagesofonlinelearningisitsflexibility.Studentscanaccesscoursematerialsatanytimeandfromanywhere,providedtheyhaveaninternetconnection.Thisisparticularlybeneficialforworkingprofessionalswhowishtoupskillwithoutgivinguptheirjobs,andforparentswhoneedtobalancefamilyresponsibilitieswiththeirstudies.C.Costisanotherfactordrivingthepopularityofonlinecourses.Inmanycases,studyingonlineismoreaffordablethanattendingatraditionalinstitution.Learnerssaveoncommuting,housing,andcampusfees.Moreover,manyonlineplatformsofferfreeorlow-costcourses,makingeducationmoreaccessibletopeopleindevelopingcountriesandtothosewithlimitedfinancialresources.D.However,onlinelearningisnotwithoutitschallenges.Perhapsthegreatestobstacleisthelackofface-to-faceinteraction.Inaphysicalclassroom,studentscanaskquestionsimmediatelyandengageinspontaneousdiscussionswithpeersandinstructors.Online,theseexchangesoftenfeellessnaturalandrequiredeliberateefforttomaintain.E.Anothersignificantconcernisself-discipline.Withoutthestructureofregularclassschedulesandthephysicalpresenceofteachers,somestudentsfinditdifficulttostaymotivated.Onlinecoursesoftenhavehighdropoutrates,particularlyamonglearnerswhoarenotaccustomedtoindependentstudy.F.Toaddresstheseissues,manyeducationalinstitutionshavedevelopedblendedlearningmodelsthatcombineonlineinstructionwithoccasionalin-personsessions.Thishybridapproachaimstoofferthebestofbothworlds:theflexibilityofdigitallearningandthesocialbenefitsofface-to-faceteaching.G.Technologicalinfrastructurealsoplaysavitalroleinthesuccessofonlineeducation.Reliableinternetaccess,user-friendlylearningmanagementsystems,andmoderndevicesareessential.Unfortunately,thedigitaldividemeansthatstudentsinruralorimpoverishedareasareoftenleftbehind,deepeningeducationalinequality.H.Lookingahead,expertspredictthatonlinelearningwillcontinuetoevolve.Artificialintelligencemaysoonprovidepersonalizedlearningexperiencestailoredtoeachstudent'spaceandstyle.Virtualrealitycouldcreateimmersiveclassroomswherestudentsfromdifferentcontinentslearntogetherasiftheywereinthesameroom.I.Inconclusion,onlinelearningisnotatemporarytrendbutapermanentfeatureofmoderneducation.Whileitfacesrealchallenges,itsbenefits—flexibility,affordability,andreach—makeitanindispensabletoolforspreadingknowledgeacrosstheglobe.36.Onlinelearningisespeciallysuitableforpeoplewhoneedtobalanceworkandstudy.37.Thepandemicgreatlyacceleratedtheshifttoonlineeducation.38.Acombinedapproachofonlineandofflineteachinghasbeenadoptedtoovercometheshortcomingsofpureonlinelearning.39.Studentsinpoorareasmayfacedifficultiesinjoiningonlinecoursesduetothedigitaldivide.40.Onemajorproblemofonlineeducationisthatlearnerstendtolackmotivation.41.Comparedwithclassroomteaching,onlinecoursestendtobemoreeconomical.42.Onlinelearningislikelytobecombinedwithartificialintelligencetechnologiesinthefuture.43.Studentsinonlinecoursesoftenmissthedirectcommunicationwithteachersandclassmates.44.Theauthorholdsapositiveviewofthefutureofonlinelearning.45.Expertsbelievethatonlinelearningwillbeapermanentpartofeducation.36.答案：B解析B段提到onlinelearning对workingprofessionals和parents特别有利，对应"balanceworkandstudy"。37.答案：A解析A段明确指出"TheCOVID-19pandemicacceleratedthistrenddramatically"，对应题干。38.答案：F解析F段提到"blendedlearningmodelsthatcombineonlineinstructionwithoccasionalin-personsessions"——线上线下混合教学模式，对应题干。39.答案：G解析G段讨论"digitaldivide"导致贫困地区学生被落下，对应题干。40.答案：E解析E段提到"somestudentsfinditdifficulttostaymotivated"以及"highdropoutrates"，对应题干。41.答案：C解析C段首句"Costisanotherfactordrivingthepopularityofonlinecourses"，并指出线上学习更经济，对应题干。42.答案：H解析H段提到"Artificialintelligencemaysoonprovidepersonalizedlearningexperiences"，对应题干。43.答案：D解析D段指出"thelackofface-to-faceinteraction"是最大的挑战，对应题干中的"missthedirectcommunication"。44.答案：I解析I段为总结段，作者认为在线学习"notatemporarytrendbutapermanentfeature"，且是"indispensabletool"，态度积极，对应题干。45.答案：I解析I段明确指出"onlinelearning...isapermanentfeatureofmoderneducation"，对应题干。SectionC仔细阅读（CarefulReading，共10题，每题14.2分）PassageOneQuestions46to50arebasedonthefollowingpassage.Fordecades,expertshavewarnedthatmultitasking—attemptingtoperformtwoormoretaskssimultaneously—reducesefficiencyandimpairsperformance.Yetmanypeople,especiallyyoungerworkers,pridethemselvesontheirabilitytojugglemultiplescreensandtasksatonce.Newresearch,however,suggeststhattheconflictbetweenourdesiretomultitaskandourcognitivelimitationsmayberootedinanevendeeperproblem:ourgrowinginabilitytofocusonanysingletaskforasustainedperiod.Arecentstudyconductedatamajoruniversitytrackedtheworkhabitsofover1,000employeesacrossvariousindustries.Theresearchersfoundthatparticipantsswitchedbetweentaskseverythreeminutesonaverage,andthatittookthemnearly25minutestofullyregaintheirfocusaftereachinterruption.Inotherwords,theconstantswitchingdidnotsavetime—itwastedit.Furthermore,thosewhomultitaskedmostfrequentlyreportedthehighestlevelsofstressandburnout.Interestingly,thesamestudyrevealedthatmanyparticipantsbelievedtheywereexceptionallygoodatmultitasking,eventhoughtheiractualperformancetoldadifferentstory.Thisillusionofcompetence,theresearcherssuggest,ispartlyaproductofmoderntechnology,whichrewardsrapidresponsesandcreatesthefeelingofconstantproductivity.Inreality,thequalityofworkoftensuffers,andimportantdetailsareoverlooked.Sowhatcanbedone?Theresearchersrecommendasimpleyeteffectivestrategy:batching.Insteadofrespondingtoemailsandmessagesastheyarrive,setasidespecifictimesofthedaytohandlethem.Similarly,dedicateuninterruptedblocksoftime—perhaps60to90minutes—toyourmostdemandingtasks.Bytrainingourbrainstofocusononethingatatime,wecannotonlyimprovethequalityofourworkbutalsoreducestress.46.Whatdoestherecentstudyrevealabouttaskswitching?A.Itimprovesworkefficiencyinthelongrun.B.Itcostsworkersmoretimethanitsaves.C.Itismorecommonamongyoungeremployees.D.Ithelpsworkerscopewithstress.答案B解析第二段明确指出"theconstantswitchingdidnotsavetime—itwastedit"（持续切换并不会节省时间，反而浪费时间），故选B。47.Whatdidtheparticipantsinthestudybelieveaboutthemselves?A.Theyweremoreproductivethantheircolleagues.B.Theywereespeciallyskilledatmultitasking.C.Theypreferredworkinginaquietenvironment.D.Theyperformedbetterunderpressure.答案B解析第三段提到"manyparticipantsbelievedtheywereexceptionallygoodatmultitasking"——许多参与者认为自己特别擅长多任务处理，故选B。48.Whatdoestheauthorsuggestcausedthe"illusionofcompetence"?A.Thelackofaccuratefeedback.B.Therapidpaceofmoderntechnology.C.Theconstantpressurefromsupervisors.D.Theinfluenceofworkplaceculture.答案B解析第三段指出"thisillusionofcompetence...ispartlyaproductofmoderntechnology,whichrewardsrapidresponses"——部分归因于现代技术的产物，故选B。49.Whatisthe"batching"strategymentionedinthepassage?A.Dealingwithemailsandmessagesatsettimes.B.Avoidingallelectronicdevicesduringwork.C.Breakinglargetasksintosmallerones.D.Workinginateamtosharetheworkload.答案A解析最后一段说"setasidespecifictimesofthedaytohandlethem[emailsandmessages]"，这就是batching策略的核心，故选A。50.Whatisthemainideaofthepassage?A.Multitaskingisavaluableskillinthemodernworkplace.B.Technologyhasmadepeoplemoreproductive.C.Focusingononetaskatatimeimprovesbothworkqualityandwellbeing.D.Workplacestresscanbeeliminatedthroughbettertimemanagement.答案C解析全文从揭示多任务处理的效率问题出发，最后提出专注单任务的建议，主旨是"一次专注于一项任务能同时提升工作质量和幸福感"，故选C。PassageTwoQuestions51to55arebasedonthefollowingpassage.Theconceptof"foodmiles"—thedistancefoodtravelsfromwhereitisproducedtowhereitisconsumed—hasbecomeapopularmeasureofenvironmentalimpact.Consumersareincreasinglyurgedtobuylocallyproducedfoodinordertoreducecarbonemissionsassociatedwithtransportation.Onthesurface,thisargumentseemslogical:fewermilesshouldmeanfeweremissions.However,recentstudieshaveshownthattherelationshipbetweenfoodmilesandenvironmentalimpactisfarmorecomplexthanitappears.Infact,formanyfoods,transportationrepresentsonlyasmallfractionoftotalemissions.Thebulkofemissionsoftencomefromtheproductionstage.Forexample,producing1kilogramofbeefgeneratesabout60kilogramsofgreenhousegases,whileproducing1kilogramoftomatoesinaheatedgreenhousecangeneratemoreemissionsthangrowingthesametomatoesoutdoorsthousandsofkilometersaway.Thisdoesnotmeanthatlocalfoodismeaningless.Buyinglocalsupportsregionalfarmers,booststhelocaleconomy,andoftenresultsinfresherproduce.Moreover,locallygrownfoodmaypreservegeneticdiversitybykeepingtraditionalvarietiesalive.Butifthegoalispurelytoreducegreenhousegasemissions,the"foodmiles"labelcanbemisleading.Amorecomprehensiveapproach,researchersargue,istoconsiderthefulllifecycleofafoodproduct—includingproductionmethods,packaging,storage,andcooking.Underthisbroaderview,eatingaseasonal,plant-baseddiet,andreducingfoodwaste,areamongthemosteffectivewaystolessenourenvironmentalfootprint.Ultimately,thechoicebetweenlocalandimportedfoodisnotalwaysassimpleascountingthemiles.51.Whatisthemainargumentforbuyinglocallyproducedfood?A.Ittastesbetterthanimportedfood.B.Itreducesemissionsfromtransportation.C.Itisusuallycheaperthanimportedfood.D.Ithelpspreservetraditionalfarmingmethods.答案B解析