河南省通许县丽星中学高三3月份第一次模拟考试新高考英语试卷及答案解析

河南省通许县丽星中学高三3月份第一次模拟考试新高考英语试卷请考生注意：1．请用2B铅笔将选择题答案涂填在答题纸相应位置上，请用0．5毫米及以上黑色字迹的钢笔或签字笔将主观题的答案写在答题纸相应的答题区内。写在试题卷、草稿纸上均无效。2．答题前，认真阅读答题纸上的《注意事项》，按规定答题。第一部分（共20小题，每小题1.5分，满分30分）1．—HowmuchdoyouchargefortheiPhone?—Well,itcostme$400,butI’ll________20%asit’snolongernew.A．reducetoB．decreasetoC．knockoffD．cutoff2．ItwaswhenshefirstarrivedinChina_____shedevelopedapassionforpaper-cutting.A．where B．thatC．how D．why3．LichunisaChinesewordforoneofthe24solarterms,meansthebeginningofspring.A．who B．that C．whose D．which4．---Let'swalktothatvillagetogether.---__________.Howcanwetwogirlsdothatinthedark？A．Iagreewithyou. B．That'sagoodpoint.C．Youmustbejoking！ D．That'snotyouropinion！5．So________sometimesintryingtoaccomplishsomethingbig_______wefailtonoticethelittlethingsthatgivelifeitsmagic.A．wegetcaughtup;asB．dowegetcaughtup;thatC．caughtupgetwe;asD．caughtupdoweget;that6．Thecustomsofficerswereinsistingthatsuitcasesshouldbeopenedandtheircontents_______forcloserinspection.A．laidout B．givenout C．sentout D．pickedout7．—Whynotbuyasecond-handcarfirstifyoudon’thaveenoughmoneyforanewone?—That’sagood________.A．saying B．questionC．account D．suggestion8．Iusuallydothewashingupandleavethecookingtomywife，______she’sabettercookthanme．A．unless B．as C．eventhough D．incase9．—CanIlieaboutseeingatextbecauseIwastoobusyorlazytorespondtoit?—Receivingatextdoesnotnecessarilymeanyouhavetorespond．Whywasteaperfectlygoodlie________thetruthwillserve?A．unless B．until C．when D．while10．Duetoaterriblefluthat________on,manystudentsdon’tshowuptoschooltoday.A．goes B．wasgoing C．isgoing D．hasgone11．—Sir,I’mlatebecausemycarbrokedownontheway.—________.I’vehadenoughofyourexcuses.A．Cutitout B．Suityourself C．Youcan’tbeserious D．Itmakessense12．carefullyforlongtime,theopeningceremonywonagreatsuccess.A．HavingpreparedB．TobepreparedC．BeingpreparedD．Havingbeenprepared13．--Ifeelnervouswhentakinganexam.--andyoucandoitwell.A．TakeitweasyB．TakeyourtimeC．GoodluckD．It’suptoyou14．Weclimbeduptothetopofahill,___________wegotagoodviewofthewholeforestpark.A．which B．whereC．when D．that15．Whydomanystudentssticktoprivatetutoring_____theycouldeasilymastersuchknowledgeatschool?A．unless B．before C．after D．when16．Thankstothespecialchemical________ofthesoilinthemountainousarea,thiseconomicplantgrowswellthere.A．compositionB．competenceC．constructionD．conclusion17．--Wheneveryouwantagoodmeal,cometomyrestaurantandeatforfree.--Believeme.Thatisan________Iwillnotrefuse.A．approach B．offerC．idea D．instruction18．Iwasexpectingapresentfromher,soIwasdisappointedIdidn’treceive______.A．it B．one C．that D．theone19．________childrenbelievetheycansucceed,theywillneverbecometotallyindependent.A．IfB．SinceC．UnlessD．Though20．TheLifelongLearningProgramme________toenablepeopletotakepartinlearningexperienceshastakenoffacrossEurope.A．havingbeendesigned B．beingdesignedC．designed D．designing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）Backin2009,ChinawaswronglyaccusedbytheWestof"controlling"theCopenhagentalksonclimatechange.BythenChinahadtrulycarriedoutstrictpoliciestoreducetheenergyconsumptionofeconomicactivitiesandattheinternationallevel,thetopChineseleadersparticipatedinround-clockeffortstocooperatewiththemajorplayerstobuildaunitedfrontforeffortstosolveglobalwarming.ButChinawasfinallymisjudged.ThismisjudgmentcausedChina'sscholarstorethinkChina'sclimatechangecommunicativeways.AmongthemwasZhengBaowei,journalismprofessorofRenminUniversityofChina,whorealizedChinahadtobettershapeitscommunicationonitsenvironmentalprotection.Delightfully,theeffortshavepaidoff.Zhengsetupatop-levelinternationalgroupadvisinghisresearchteam.Heisinchargeofdoctoralcandidatesonclimatechangecommunication.Climateawarenesssurveyshavebeenconducted,andapackageofcommunicationtoolshasbeendesigned.Manyseminarshavebeenarranged.Recently,hearrangedaseminaronclimatechangeandhealthcommunicationonthechangingsituationbothinChinaandtheworld.Firstofall,thisstressedthatChina'spolicyhasdevelopedfromreducingitsenergyconsumptionandpollutionpreventiontotheimportantgoalsofachievinga"BeautifulChina"and"'HealthyChina,"whilecomingupwithplanstorealizeanecologicalcivilizationsincelate2012.Withsuchgoals,ChinaplayedaleadingroleinsecuringtheParisclimatechangedealin2015togetherwiththeUnitedStatesandEuropeanUnion.InParis,Chinapromisedtoletoutitscarbontothemaximumin2030.Itisademandingjobcommunicatingclimatechangeandothertopicsoflastingdevelopmentwell.Despitethat,someforeignscholarshaverealizedChina'ssmartwaysinpresentingthegreenconcepts.TheyappreciatedChina'sideaofbuildinga"BeautifulChina"and"HealthyChina"andsaiditcanheexpandedintoanideaofa"BeautifulWorld"and"HealthyWorld".LookingbackfromhowChinahadfollowedthestepsoftheindustrializedcountriesinadvocatingclimatefight,peoplefindnowitsowngreenideasarebeingrecognized.1、WhatdidtheWestthinkoftheroleChinaplayedinCopenhagentalksin2009?A．Chinaworkedsuccessfullywithothercountries.B．Chinasucceededinhostingtheconferences.C．Chinaparticipatedpassivelyinallthetalks.D．Chinaplayedanegativepartinthetalks.2、HowdidChinadealwiththemisjudgment?A．Chinahadtoimprovecommunicativewayswithothercountries.B．Chinasparednoefforttopreventairandwaterbeingpolluted.C．Chinamadegreateffortstoprotecttheenvironment.D．Chinaintendedtogainfairjudgmentfromtheworld.3、WhatisChina'spolicyonclimatechangeandhealthcommunication?A．Reducingasmuchenergyconsumptionaspossibletocontrolpollution.B．FocusingmoreonrealizinganecologicalcivilizationinChina.C．Communicatingclimatechangeandsomeothertopicswell.D．Reachingthegoalsofa"BeautifulChina"and"HealthyChina".4、WhatmakesChina'sgreenideawellreceived?A．Chinamakingpromisestoletoutitscarbontothemaximumin2030.B．Chinareducingitsenergyconsumptionaswellaspollutionprevention.C．China'sideabeingupdatedtothatofaBeautifulWorldandHealthyWorld.D．Chinafollowingthestepsoftheindustrializedcountriesfightingglobalwarming.22．（8分）Wewouldliketowishallourreadersawonderfulwinterbreak.OurJanuarymagazineisnowintheshopsandavailabledigitally.We’relookingforwardtosharingmoreadventuresanddiscoverieswithyouin2018,including:AtacrossroadsintheAtlanticAsthepopulationofAscensionIslandrisesuptomarkthe200thanniversaryofBritishrule,FredPearcewonderswhatthefuturemighthaveinstoreforthisstrangepartofland.Photostory:OntheroadagainAselectionofimagesfromanexhibitionopeningthismonthattheRoyalGeographicalSocietygohandinhandwithM.AurelStein’searly20thcenturyphotographsoftheSilkRoad.Dossier:GoingundergroundMarkRowediscussestherolethatcarbonstoragecanplayintheglobalefforttoreducecarbondioxideemission(排放).NetlossKitGilletreportsfromtheGulfofThailand,whosefisheries(渔场)havebeenalmostdestroyedbythecommercializationoftheThaifishingindustry.Anddon’tforget......around-upofthelatestgeographicalandclimatesciencenews;ahotspotfocusonTurkey;adviceontakingphotographsinAntarctica;aninterviewwithLucienCastaing-Taylor,professorofvisualartsatHarvard;pluslots,lotsmore...Buyyourcopynow,clickhereandsaveupto35%orcall+44(0)1635588496.GeographicalisalsoavailableinWHSmithandmanyindependentnewsagents.1、Ifyouwanttoreadsomethingaboutglobalwarming,youcanread.A．Dossier:GoingundergroundB．Photostory:OntheroadagainC．AtacrossroadsintheAtlanticD．Netloss2、WhichofthefollowingstatementsisTRUE?A．AscensionIslandhasabrightfuturewithmorepopulation.B．CommercializationcontributestothelossoffisheryinThai.C．TheJanuaryeditionof2014istocomeoutinthewinterbreak.D．Thetopicsofthismagazinefocusongeographyandinterviews.3、Thepassageiswrittento.A．attractreaderstobuythemagazineB．giveadviceontakingphotosC．shareadventuresanddiscoveriesD．introducethecontentofthemagazine23．（8分）Inthelastfewweeks,donationshavebeenmailedtocommunityorganizationsinandnearRedfordTownshipbythesenderwhoonlyidentifiesas“Anonymous-1679”,accordingtoMyFoxDetroit.Sofar,envelopes,eachfilledwith$1,000cash,havebeensenttothelocallibrary,ananimalwelfarenon-profit,acivicandleadershiptraininggroup,acreditunionandtheRedfordGoodfellows,agroupthathelpsneedyfamiliesgetholidaymealsandgiftsfortheirchildren.Thereisoneclueabouttheidentityofthegiver.AccordingtotheObserver&Eccentric,theCommunityChoiceCreditUnioninRedfordreceivedthefirstenvelope,whichalsoincludedariddle:“Knowtheclue,Knowthewho,Anonymous-1679.”Spreadaroundonecommunity,thedonationscouldmakeaseriousimpact.Thecredituniontoldthepaperthatthedonationwillgototheirfoundation,whichgivesupto$100,000incollegescholarshipstoMichiganhighschoolgraduateseachyear.TailWaggers1990innearbyLivoniahelpsownersprovidefortheirpets,offeringlow-costvaccinations,apetfoodpantryandassistanceforpetswithserioushealthproblems.Theirdonationwillgotowardtheirnewanimalclinic,theytoldFox.CindyDoyle,secretaryfortheRedfordGoodfellows,saidthattheir$1,000donationwilllikelycoverfood,clothesandpresentsfor10families;lastyeartheorganizationserved225familiestotal.“ThatmoneywillgoalongwaytobrightentheChristmasofseveralchildrenthisyear,”theRedfordTownshipPolicepostedonFacebook,onbehalfoftheirdepartmentandtheGoodfellows.“Tothatgenerousperson...ThankYou!”Anonymous1679hasgivenmorethanmoney—heorshehasalsodirectedattentiontosomeoftheorganizationshelpingthecommunity,andmayeveninspireotherstogive.Potentialdonorsshouldkeepinmindthatwhilereceivingmysteriouscashinthemailmaybeexciting,theU.S.PostalServicerecommendssendingmoneyordersratherthancurrencyincasemailislostorstolen.1、Accordingtothepassage,envelopshavebeenmailedtothefollowingexcept________.A．alocallibraryB．needyfamiliesC．theCommunityChoiceCreditUnionD．TailWaggers19902、Itcanbeknownfromthepassagethat________.A．thedonationsaddedupto$100,000B．thedonationsweremadeintheformofchequesC．itwillbelongbeforethecitizensbenefitfromthedonationsD．whomadethedonationsremainsamystery3、Howwillthedonationsbeused?A．TohelpsomechildrenenjoyahappyChristmas.B．Tohelpbuildanewclinic.C．Tobuynecessitiesfor225families.D．Toofferscholarshipstohighschoolstudents.4、Whatisimpliedinthelastparagraph?A．Moremysteriouscashwillbereceivedinthefuture.B．Anonymous1679payscloseattentiontocharityorganizations.C．SendingcashwillbeforbiddenbytheU.S.PostalService.D．TheactofAnonymous1679isofgreatsignificance.24．（8分）Doyoulistentothesongsthatyourparentslike?Chancearethatyoudon’t.YouprobablythinkthemusicthattheylikeisoldanddullandthattheSongsonyourplaylistaremuchcooler.Buthereiswhatscientistsfoundrecently:people’smusictasteschangeastheyage,accordingtoastudypublishedintheJournalofPersonalityandSocialPsychology.Soit’slikelythatyourownmusicalpreferencewillfollowasimilarpathtoyourparents’whetheryoulikeitornot.Weusedtothinkthatcultureandpersonalityarctheonlyfactorsthataffectone’smusicchoice.ButresearchersattheUniversityofCambridge,UK,gathereddatafrommorethan250,000peopleoverthepast10years.Theynoticedthataspeopleage,theirsocialcircumstanceschange,andsodoestheirmusictaste.Therearethreemusicalperiodsthatpeoplepassthroughastheymature-intense”,“contemporary”and“sophisticated”.Thefirstperiodcomesintheteenagersyears,duringwhichtimepeoplelikeintensemusicsuchaspunkandrockbecauseteenagerstendtobeaggressiveandwanttoestablishtheiridentityasindependentindividuals.Butaspeoplemoveintoearlyadulthood,theirlifestylechanges—theysocializemoreandwanttobuildcloserelationshipswithothers.Asaresult,theybecomemorefondofcontemporarymusic,suchaspopandR&B,whichisusuallyupliftinganddanceableandplayedatpartieswherepeoplehangouttogetherandchat.Whenmiddleagecomes,thingshavesettleddownformostpeople.Thisperiodwillbedominated(支配)bymore“sophisticated”music,suchasjazzandclassical,aswellasmorecatchymusiclikecountry,folk,andblues.“Formany,thislifestageisfrequentlyexhaustedbyworkandfamily,andthereisarequirementforrelaxing,emotive(动情的)music,”JasonRentfrow,aresearchermember,toldThetelegraph.Butyoumustbethinking:“Aren’tthereoldpeoplewhoarestillintorockmusic?”Ofcoursethereare.ButRentfrowexplainedthattheirreasonsforlisteningtorockmusicmayhavechanged.“Weusemusicfordifferentreasons,”hesaid,andthusatthatagepeoplemaylistentoremindthemselvesoftheiryouths.1、Whydochildrenusuallylikedifferentsongsfromtheirparentsaccordingtothepassage?A．Childrenprefercoolmusic.B．Musictastechangeswithage.C．parents’songsarealwaysdull.D．Parentshavebettersocialcircumstances.2、Theunderlinedword“catchy”inParagraph7probablymeans________.A．touchingandeasilyrememberedB．awkwardandeasilycapturedC．elegantbutdifficulttounderstandD．flexibleanddifficulttocatch3、Middleageisaperiodwhenpeople________.A．haveanaggressivegoalB．likePopandR&BC．desirecloseconnectionswithothersD．leadastressfullife4、Whatcanweinferfromthelastparagraph?A．Oldpeopledon’tlikerockmusic.B．Musiccanserveasareminder.C．Rockmusicmakesoldpeopleyounger.D．Listeningtorockmusicneedsreasons.5、What’sthemainideaofthepassage?A．Whydopeoplelikemusic?B．Howcanyouimproveyourmusictalent?C．Whatinfluencespeopledmusictaste?D．Whydodifferentpeoplelikedifferentmusic?25．（10分）TheDomestication（驯化）ofCatsForcenturies,thecommonviewofhowdomesticationhadoccurredwasthatprehistoricpeople,realizinghowusefulitwouldbetohaveanimalskeptforfood,begancatchingwildanimalsandbreeding（繁殖）them.Overtime,byallowingonlyanimalswith“tame”（驯养）characteristicstoproducetheirbabies,humanbeingscreatedanimalsthatwerelesswildandmoredependentuponpeople.Eventuallythisprocessledtothedomesticfarmanimalsandpetsthatweknowtoday,havinglosttheirancientsurvivalskillsandnaturalabilities.Recentresearchsuggeststhatthisviewofdomesticationisincomplete.Prehistorichumanbeingsdidcatchandbreedusefulwildanimals,butspecialistsinanimalbehaviornowthinkthatdomesticationwasnotsimplysomethingpeopledidtoanimals—theanimalsplayedanactivepartintheprocess.Wolvesandwildhorses,forexample,mayhavetakenthefirststepsintheirowndomesticationbyhangingaroundhumansettlements,feedingonpeople’scropsandgettingusedtohumanactivity.Theanimalswhichwerenottoonervousorfearfultolivenearpeopleproducedtheirbabiesthatalsotoleratedhumans,makingiteasierforpeopletocatchandbreedthem.Inthisversion,peoplesucceededindomesticatingonlyanimalsthathadalreadyadaptedeasilytolifearoundhumans.Domesticationrequiredananimalthatwaswillingtobecomedomestic.Theprocesswasmorelikeadancewithpartnersthanavictoryofhumansoveranimals.Atfirstglance,thelamingofcatsseemstofitnicelyintothisnewstoryofdomestication.AtraditionaltheorysaysthatafterprehistoricpeopleinEgyptinventedagricultureandstartedfarming,ratsandmicegatheredtofeastontheirstoredgrain.Wildcats,intum,gatheredatthesameplacestohuntandeattheratsandmice.Overtime,catsgotusedtopeopleandpeoplegotusedtocats.Somestudiesofwildcats,however,seemtocallthistheoryintoquestion.Wildcatsdon’tsharehuntingandfeedingareas,andtheydon’tliveclosetopeople.Expertsdonotknowwhetherwildcatswerepartnersintheirowndomestication.Theydoknowthatlongafterpeoplehadacquireddomesticdogs,sheepandhorses,theysomehowacquireddomesticcats.Graduallytheyproducedanimalswithincreasinglytamequalities.1、Whatissuggestedinrecentresearch?A．Animalswerelessafraidthanthought.B．Animalshadanactiveroleintheirdomestication.C．Wolvesandhorseswerethefirsttobedomesticated.D．Domesticationmeantsomethingpeopledidtoanimals.2、Theword“dance”isusedinParagraph3toshowthat._A．animalsandhumanswerecloseB．controloveranimalswaseasyC．animalswereindependentofhumansD．domesticationwaslikeagame3、Whatprobablyattractedcatstohumansettlements?A．Othercats.B．Warmth.C．Humans.D．Food4、Whatcausesaproblemforthetheorythatcatsweredomesticatedlikewolveswas?A．Catswerenotfriendlytopeople.B．Catswerenotasfierceaswolves.C．Catshadthecharacteristicofindependence.D．Catsshowedclevernesswhentheywerehunting.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）MyTeacherintheSchoolofLifeIspenttheopeningdayofschoolthisyearatDeMathaCatholicHighSchoolinmuchthesamewayIspentthefirstdayofclasses130yearsago;IsatinDrCharlesE.Offutt’sBritishliteratureclass,listeningtohim2whathisseniorswouldlearnandgetthemexcitedaboutthejourneytheywould3I’mtheprincipal(校长)oftheschoolnow,butforafewminutesIwasbackin1975,4whatthefutureheld.IhavebeenlearningfromDrOffuttfor30ofthe51yearshehadbeenteachingatDeMatha.Henotonlytaughtmetothink,he5me,asmuchbyexampleas6thatitwasmymoraldutytodosoandtoserve7.Neitherofuscouldknowhowour8woulddevelopovertheyears.WhenIfirstcamebacktoDeMathatoteachEnglish.IworkedforDrOffutt,thethendepartmentchair.Afterseveralyears,Iwas9departmentchair,andourrelationshipchanged10.Ithoughtthatitmightbe11chairingthedepartment,sinceallofmyformerEnglishteacherswerestillthere,butDrOffutt12methroughout.Heknewwhentogiveme13aboutcurriculum,textsandpersonnel,andwhentoletmedesignmyowncourse.In1997,IneededhisadviceaboutleavingDeMathatobecomeprincipalatanotherschool.IfhehadaskedmetostayatDeMatha,Imighthave.14,heencouragedmetoseizethenew15Fiveyearsago,Ibecamethe16ofDeMatha.Onceagain,DrOffuttwasthereforme,lettingmeknowthatIcould17onhimasItriedtofillsuchbigshoes.I’velearnedfromhimthatgreatteachershavea(n)18wealthoflessonstoteach.19hisstudentsdon’tknowityet,Iknowhow20theyare;I’mstilloneofthem.1、A．mostlyB．exactlyC．onlyD．simply2、A．explainB．predictC．speakD．teach3、A．keepB．achieveC．chooseD．take4、A．preparingB．discoveringC．wonderingD．realizing5、A．assistedB．remindedC．advisedD．convinced6、A．wordsB．actionC．explanationD．models7、A．theothersB．everyoneC．othersD．anyone8、A．relationshipB．positionC．situationD．condition9、A．pointedB．namedC．givenD．taken10、A．alreadyB．yetC．stillD．again11、A．foolishB．surprisingC．uncertainD．challenging12、A．promotedB．acceptedC．supportedD．welcomed13、A．adviceB．informationC．noticeD．thought14、A．OtherwiseB．ThereforeC．FurthermoreD．Instead15、A．choiceB．opportunityC．occupationD．possibility16、A．teacherB．principalC．officerD．clerk17、A．liveB．lookC．dependD．take18、A．richB．littleC．valuableD．endless19、A．OnceB．EvenifC．UnlessD．Until20、A．fortunateB．curiousC．innocentD．satisfied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）阅谈下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。TheinformationI1．(collect)inthelastfewyearsleadsmetobelievethatspeedreadingmaybeless2．(use)thanmostpeoplethink.Theclaimthatyoucanreadandcomprehendover30,000wordsperminuteisoverstated.Oneresearcherprovedthisinastudy3．irrelevantandillogicalsentenceswereaddedtothetext.The“speedreaders”testeddidn’tnoticetheirrelevantlines–thereaderswhoreadslowlyspottedthemimmediately.I’veinterviewedpeoplewhohaveattendedtheintroductorysessions4．(offer)bysomespeedreadingcourses.5．(them)storiesindicatethatimpropermethodsaresometimesusedtotellthecourses.Hereishow:First,you’reaskedtoreadapassagefromabook6．whichmostpersonswouldbeunfamiliar.Yourreadingspeedandcomprehensionaretestedduringthisexercise.Then,afterabouthalf7．hourofinstruction,anotherreadingtestisgiven.ButthistimethereadingistheonemostAmericansknowwell–suchasAdventuresofHuckleberryFinn.Not8．(surprising),personsattendingtheseintroductorysessionsfindthattheir“exit”speedandcomprehensionarebetterthantheir“entry”9．(perform).I’moneofthefictionreaderswhoappreciatethebeautyingoodwriting.OccasionallyI’llreadapassageorsentenceoverandoveragainjusttoletthebeautyofitsconstructionsoakin(渗透).Goodwritingmustbereadcarefullyandthoughtfully10．(appreciate).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短文，请你修改你同桌写的以下作文，文中共存10处语言错误，每句中最多有两处，每处错误仅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（^），并在其下而写出该加的词。删除:把多余的词用斜线(\)划掉。修改:在错的词下面画一横线，并在其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。Mymathteacherisusedtotakeoffhisovercoatassoonashecomesintotheclassroom.Afterthat,hewillasksomeoneansweraquestion.Insteadofgivingtheanswer,heletussolvetheproblemonhisown.Healwaysexplainsthemethodclear,andintroducesmanyapproachtoworkingouttheproblem.Atfirst,ourclassmathperformancewasbadthanthatoftheotherclass.However,withhishelp,wehadovertakenthem.Inaddition,healwayskeepshisword.Heusedtopromiseusasifwec