外研版高中英语选择性必修第二册Unit5 Part3 Developing ideas Presenting ideas练习含答案

Unit5AdelicateworldPart3Developingideas&Presentingideas基础过关练Ⅰ.单词拼写1.Igivemywarmest(问候)andbestwishestomyoldandnewfriends.

2.Thevividdescriptiongaveusa(视觉的)representationoftheharmoniouslifeinthevillage.

3.(2022全国甲)EverywhereinSydneythesedays,changeandprogressarethewatchwords(口号),andtraditionsareincreasingly(罕见的).

4.(2024福建省福州格致中学期中)Theachievementsoftheirrevolutionweregreat,anditsfailure,byc,wereminor.

Ⅱ.一词多义1.①Wemadeourdepartureintheearlymorning.词性:词义:

②Nowshe'swrittenanovelwhichisnotamysterybutaconsiderabledeparturefromherpreviouswork.词性:词义:

2.①Multiply6and7togetherandyouget42.词性:词义:

②Ifananimalwasinfectious,thebacteriawouldmultiplyquickly.词性:词义:

Ⅲ.单句语法填空1.Chinarecentlyissuedanactionplanforsavingfoodtoensureitssuppliesand(secure).

2.(2022北京改编)IwantedtobeperfectatwhateverIdid,which(apparent)inlifeisimpossible,butitconsumedme.

3.(2021全国甲)Theglobalblackrhinopopulationhasdroppedaslowas5500,givingtherhinosa“critically(danger)”status.

4.It'svitalthatchildrenshouldavoidplayingontheroadtosecurethemselvesdanger.

5.Theelephantshereshowusthatmankindcancoexistalltheotherlivingbeingsmakingourworldmagical.

6.Somenaturalofancienttimesarestilltopeopletoday.(mystery)

7.Myownproblemsseeminsignificant(compare)withotherpeople's.

8.TheInternethasmadepossibleforfriendsandfamilytokeepintoucheasilyeveniftheyareonoppositesidesoftheworld.

Ⅳ.完成句子1.(2021浙江1月写作)我谨代表我们学校对你们的到来表示诚挚的欢迎。,Iwouldliketoconveymysincerewelcometoyourvisiting.

2.当我朋友告诉我真相时,我才知道我误解了你,所以我应该向你道歉。(倒装句,owe)OnlywhenmyfriendtoldmethetruthIhadmisunderstoodyou,soI.

3.她一冲出房间,后悔的眼泪就滚落脸颊。(一句多译:hardly)①Shethehousewhentearsofregretrolleddownhercheeks.

②Hardlythehousewhentearsofregretrolleddownhercheeks.(读后续写—场景描写)

能力提升练Ⅰ.课文语法填空In2016,ShennongjiawasmadeontotheUNESCOWorldHeritageList.Itwasawardedthestatusbecauseitmeetstwo1(criterion)requiredbythelist.Itisoneofthemost“complete”naturalareasin2worldandhasincrediblebiodiversity.

Shennongjia3(range)fromabout400metrestoover3,000metresabovesealevel,whichgivesagreatvariationinclimate,4(allow)varietiesofspeciestolive.Someofthem,5(regard)aslivingfossils,havesurvivedmillionsofyears.

Untilnow,over3,000plantspecies6(find)inShennongjia,whichrepresentsovertenpercentofChina'stotalfloralrichness.Morethan600vertebratespeciesandaround4,300insectspeciesarelivingthere.Scientistscanobservethe7(ecology)andbiologicalprocessinrealtime.

Scientistsmakegreatefforts8(look)afterthevariousspecies.However,thelocalpeoplearethemostimpressivefortakingthingsfromnaturewithoutdamageandtheylive9harmonywithnature.Allarethereasons10ShennongjiadeservesitsplaceontheUNESCOWorldHeritageList.

1.2.3.4.5.

6.7.8.9.10.

Ⅱ.语法填空(2024辽宁抚顺六校协作体期中)Shennongjiaissaidtobetheplace1EmperorYanoncelived.Somevisitorshopethattheymayevenencounterthemysteriouswildmenintheremotemountainsandvirgin(原始状态的)forests.Theydonot2(actual)seeanywildmen,buttheyareattractedbyShennongjia'svibrant(充满生机的)ecology,richbiodiversityandkarstlandforms.

Shennongjia'sbeauty3(vary)overtheyearasnaturetakesitscourse.4(tourist)canenjoyflowerblossomsinspring,beshadedfromthesummerheat,appreciateredleavesinautumn5goskiinginwinter.In2017,Chinaannounceditsplanfor6(build)10pilotnationalparksforecosystemconservation,includingtheShennongjiaForestryDistrict,HubeiProvince.

OfficialdatashowedthatvisitorstotheShennongjiaForestryDistrict7(reach)about15.5millionin2020.By2025,theforestareaaims8(increase)thatannualfiguretoover30million,withtourismrevenueofmorethan10billionyuan.

Visitorscanemployabusserviceiftheydonotdrive9(they)owncars.ThejourneytoShennongjiawilltakeabout3.5hoursfromnearbyYichangbycoach.In2021,Shennongjiawasconnectedto10newlybuiltfreeway,makingthemountainousregionmoreaccessible.

1.2.3.4.5.

6.7.8.9.10.

Ⅲ.阅读理解(2024重庆巴蜀中学期中)COVID-19isnotthefirstdiseasetomigratefromanimalstohumans.TheBlackDeathofthe14centurywasspreadbyfleas(跳蚤).TheH1N1virusbehindtheepidemicof1918originatedinbirds.Thelistgoeson.Inthelasttwodecadesalone,we'vebeenhauntedbyzoonotic(动物传染病的)outbreaks,includingSARS,MERS,Ebola,birdflu,andmostrecently,COVID-19andmonkeypox.SomeresearchersarebeginningtocallthiseraaPandemicene.AstudypublishedinthejournalNatureinAprilsuggeststhatclimatechangemaybetoblame.“Thestudycomesfromasimpleidea,”saysColinCarlson,aglobalchangebiologistandaleadauthorofthepaper.Climatechangeismakingmanyhabitatsinhabitable.Whenanimalsmigratetowardcoolerclimates,theyintroducevirusestonewenvironments.“Thatleadstointerestingproblemsfromaviralstandpoint,”saysCarlson.Topredictdisplacementpatterns,Carlsonandhiscolleaguestaughtmachine-learningmodelsthekindsofhabitatsusedbydifferentmammals.Themodelingsoftwarethenpredicted,underarangeofpossibleclimatefutures,wheresuchconditionsmightbefoundin2070,heexplained.Manyanimalswillheadtocoolermountains,ortocoastalregionswithmildclimates;Indonesia,thePhilippines,theGreatRiftValley,andtheSahelregionareallexpectedtohavesky-highhumanpopulationdensityandbiodiversitylevelsbytheyear2070,makingthemeasytobeaffectedbyoutbreaksofzoonoticdisease.Carlsonandhiscolleaguespairedthesepredictionswithamodelthatanalyzeswhydifferentanimalsshareviruses.Thesameflightcapabilitiesthatmakebatsexcellentmosquito-huntersandseed-spreaders,forexample,alsomakethemmorelikelytotransmitdiseases.Andwhileit'seasierforvirusestospreadbetweencloselyrelatedspecies,evenvirusesforourdistantrelativescanfindpurchaseinus,givenenoughopportunitiesforinfection.Carlsonandhiscolleaguesestimatethatby2070,therewillbeatleast3,000instancesofnovelcross-speciesinfection.Notallwillbecomepandemics,butsomewill.1.Whyisthiseracalleda“Pandemicene”byresearchersinParagraph2?A.Manyspeciesaredisappearingfromtheearth.B.Theclimatechangehasbecomeunpredictable.C.Habitatsforwildlifearedestroyedbyhumanactivity.D.Diseasetransmittedfromanimalsistroublinghumans.2.WhichofthefollowingstatementswouldColinCarlsonprobablyagree?A.Infectiousdiseasesarerarelyrelatedtoanimals.B.Migrationofanimalscanleadtoviraloutbreaks.C.Livableplacesforwildanimalsshouldbeprotected.D.Globalpopulationanddensitywillreachthepeakin2070.3.WhatcanbeinferredfromCarlson'sresearchinParagraph5?A.Virusescanbespreadbetweendistantlyrelatedspecies.B.Bats'flightcapabilitiesmakethemimmunetodiseases.C.Wildcreaturesaregivenmanyopportunitiestospreaddisease.D.Humansmaybeinfectedwithdifferentvirusesatthesametime.4.Whatcanbeasuitabletitleforthetext?A.ColinCarlson,aGlobalChangeBiologistB.ClimateChange,aReasonforAnimalMigrationC.HabitatProtection,anEffectiveWaytoKeepBiodiversityD.Cross-SpeciesInfection,aBigThreattoHumanBeingsⅣ.七选五(2024山东青岛二中期中)Morethan40percentofAntarctica'siceshelveshavedecreasedinthepast25years,potentiallyacceleratingthesealevelrisebyallowingmorelandicetoflowintotheocean.1TheyplayacriticalroleinslowingtheflowoficeonlandintotheoceanbyessentiallyactingasawallandsurroundnearlytheentirecoastlineofAntarctica.Wheniceshelvesthinorretreat,iceonthelandcanflowintotheoceanmorequicklyandacceleratethesealevelrise.

Healthyiceshelvesnaturallyretreatandgrowovertime.Aniceshelfiscontinuouslyflowingandadvancingbutwillalsolosemassthroughmeltingorcalving,whichiswhenitsfrontbreaksoffintotheocean.2Butthelargeportionofsteadilyshrinkingiceshelvesshowsthisnaturalcycleisoff.

InWestAntarctica,theGetzIceShelfexperiencedsomeofthebiggesticelosses,shedding1.9trilliontonsoficeoverthestudyperiod.MosticeshelvesinEastAntarcticahowever,increasedinvolumeorstayedthesame.3Theregionisprotectedbyabandofcoldwateratthecoast,whichhelpskeepnearbywarmwateratbay.Evenso,thestudystillshowedpocketsofshrinkingiceshelves,andresearchersarestillinvestigatingthereasons.4

Thecurrenticeshelfdatasetisnotlongenoughforresearcherstodefinitivelymakeclimatechangeconnectionyet,butitwouldbearemarkablecoincidenceifthenaturalvariabilityiniceshelveswerejustthatmuchlarger.5Butwedon'tneedtohititbeforeseeinganeffectontheplanet.

A.Thenitcangainicefromthelandandgrowagain.B.Iceshelvesaremassivefloatingsectionsoficeextendingfromglaciersonland.C.Theeastisnotasexposedtothewarmwaterliketheothersideofthecontinent.D.Thethinningoftheiceshelveshasshownupinthesurroundingenvironment,too.E.Iceshelves,notjustthebigones,aresteadilylosingmassovertimewithnosignofrecovery.F.Onetheoryisthatthewarmerwateronthewesternsidecouldbeslowlycomingintheregion.G.Additionally,climatemodelspredicticeshelveswillsteadilyshrinkinawarmingworldasobserved,eventuallyhittingatippingpointforicesheetcollapse.1.2.3.4.5.

Ⅴ.读后续写(2023江苏南京期中)阅读下面材料,根据其内容和所给段落开头语续写两段,使之构成一篇完整的短文。Alexrodehisbikeonhiswayhome,andJohnson'spondcameintoview.Sometimeshisdadtookhimcanoeing(划独木舟)there,andAlexlovedit.Thepondwasalwayssoalivewithactivity,andsometimesAlexdiscoveredturtles(乌龟)sunbathingonsunnyrocks.Alexwascuriousaboutturtles.Whenitwastoorainytogocanoeing,heoftenwenttothelibrarytocheckoutbooksonturtles.Nowitlookedliketomorrowmightbeanothersunnyday.HedecidedtoaskDadiftheycouldgocanoeingandlookforturtlesagain.SuddenlyAlexsawsomethingintheroadupahead.Itlookedlikeabiggrayrock.Butitwasafunnyplaceforarocktobe.Hejumpedofftohavealook.Andthen,therockstartedtomove!Itwasactuallyalargeturtleslowlymakingitswayacrosstheroad!Alexknewrightawayitwasasnappingturtle.Outofthecornerofhiseye,hesawacarapproaching.Theturtlewasstillonlyhalfwayacrosstheroad.Alexknewhecouldn'tpickitupbecausesnappingturtleshaveapowerfulbiteandtheycouldevenbiteoffsomeone'sfinger!Whatcouldhedo?Thinkingfast,hestartedwavingbothhandswildly.“Stop!Stop!”hecried.Thecarslowedtoastop.“Areyouallright,Alex?”Itwashisneighbor,Mrs.Ramos.“I'mfine,Mrs.Ramos,”saidAlex.“I'mjusttryingtosaveaturtle.It'sprobablygoingtolayeggs.”“Oh,yeah.It'sspring,”saidMrs.Ramos.“So,Iguessalotofturtlesneedtolaytheireggsinthegrassacrosstheroad.”Thenshewavedgoodbyeanddroveoff.AlexthoughtaboutwhatMrs.Ramoshadsaid.“Therewouldprobablybemoreturtlestryingtocrosstheroadatthisspot!”herealized.Buthecouldn'tstandtherealldaytryingtostopcars.Helookedaroundandaroadsigncaughthiseye.Andthenhisfacebrightened.注意:续写词数应为150个左右。HejumpedonhisbikeandracedhometofindDad.

Thenextmorning,DadandAlexdrovetothepondwiththewoodensigninthecar.

答案与分层梯度式解析Unit5AdelicateworldPart3Developingideas&Presentingideas基础过关练Ⅰ.1.parisonⅡ.1.①名词;离开,出发句意:我们一大早就出发了。②名词;分歧,不同句意:现在她写了一部非悬疑小说,与她以前的作品大相径庭。2.①动词;相乘句意:6和7相乘得42。②动词;繁殖句意:如果一只动物被感染了,这种细菌将会快速繁殖。Ⅲ.1.security考查名词。句意:中国最近发布了一项节约食物的行动计划,以确保食品供应和安全。设空处与名词supplies是and连接的两个并列成分,共同作ensure的宾语,则设空处应用名词。由句意可知此处表示“安全”,应用名词security;security意为“安全”时是不可数名词。故填security。2.apparently考查副词。句意:无论我做什么,我都想做到完美,这在生活中显然是不可能的,但它消耗了我。根据句子结构和句意可知,设空处修饰句子,要用副词作状语。故填apparently。3.endangered考查形容词。句意:全球黑犀牛数量已降至5,500头,这使黑犀牛处于“极度濒危”状态。status是名词,应用形容词修饰。此处表示“濒危的”,故填endangered。4.against考查介词。句意:孩子们应该避免在马路上玩,以保护他们自己免遭危险,这是极其重要的。由句意可知,此处使用的是固定搭配“securesb.against...”,意为“保护某人免受……”。故填against。5.with考查介词。句意:这儿的大象向我们展示了人类可以和使我们的世界变得更神奇的所有其他生物共存。由句意可知,此处使用的是固定搭配“coexistwith”,表示“与……共存”。故填with。6.mysteries;mysterious考查名词复数和形容词。句意:古代的一些自然之谜对当今的人们来说仍然是神秘的。结合第一空前面的“Some”和句意可知,第一空要用名词复数形式,故填mysteries。由“arestilltopeople”及句意可知,第二空要用形容词作表语,表示“神秘的”,故填mysterious。

7.compared考查过去分词。句意:与别人的问题相比,我自己的问题似乎微不足道。该句中已有谓语seem,设空处应用非谓语动词。compare和Myownproblems之间为被动关系,故用过去分词形式。(be)comparedwith与……相比。8.it考查形式宾语。句意:互联网使朋友和家人即使天各一方也能轻松保持联系。“madepossible”是“make+it(形式宾语)+adj.(宾补)”结构。故填it。

Ⅳ.1.Onbehalfofourschool2.didIknow;oweyouanapology3.①hadhardlyrushedoutof②hadsherushedoutof能力提升练Ⅰ.1.criteria考查名词的数。空前的two表明,此处应用名词复数作meets的宾语。易错归因此题易产生拼写错误,误填成“criterions”。criterion的复数是特殊形式,不能直接加-s,应单独记忆。2.the考查冠词。intheworld是固定短语,意为“在世界上”,此处表特指。3.ranges考查时态和主谓一致。该句中which引导非限制性定语从句,which前面为主句,主句中缺少谓语。分析句意可知此处陈述客观事实,应用一般现在时。主句主语Shennongjia是第三人称单数,故填ranges。4.allowing考查现在分词。此处表示“气候的多样性使得这里生存着各种各样的物种”,由语境可知设空处表示自然而然的结果,应用现在分词作结果状语。5.regarded考查过去分词。该句已有谓语havesurvived,故此处应用非谓语动词。regard与其逻辑主语Someofthem是被动关系,应用过去分词作后置定语。6.havebeenfound考查时态、语态和主谓一致。句中which引导非限制性定语从句,which前面为主句,设空处作主句的谓语。Untilnow是现在完成时的标志性时间状语,则主句应用现在完成时;主句主语over3,000plantspecies与find之间是被动关系,应用被动语态;species单复数同形,但over3,000表明主句谓语应用复数。故填havebeenfound。类比启发常与现在完成时连用的意为“直到现在”的常用短语还有sofar、uptonow、tillnow等。7.ecological考查形容词。设空处与形容词biological为and连接的并列成分,一起作定语修饰名词process,故用形容词形式。8.tolook考查动词不定式。makeeffortstodosth.是固定结构,意为“努力做某事”。9.in考查介词。inharmonywith是固定短语,意为“与……和谐相处”。10.why考查定语从句。设空处无提示词,空前是名词reasons,此处表示“神农架入选联合国教科文组织世界遗产名录的原因”,设空处作原因状语,故此处应用why引导定语从句。Ⅱ.◎语篇解读这是一篇说明文。文章介绍了中国最受欢迎的景点之一——神农架。1.where考查定语从句。句意:据说神农架是炎帝曾经生活过的地方。分析句子结构可知,空处引导定语从句,先行词为place,关系词在从句中作地点状语,应用关系副词where。故填where。2.actually考查副词。句意:他们实际上没有看到任何野人,但是他们被神农架生机勃勃的生态、丰富的生物多样性和喀斯特地貌吸引。设空处修饰动词see,应用副词作状语。故填actually。3.varies考查时态和主谓一致。句意:随着自然的发展,神农架的美景一年四季都不一样。根据下文“overtheyearasnaturetakesitscourse”和语境可知,此处表示客观事实,应用一般现在时。主语Shennongjia'sbeauty是不可数名词短语,谓语动词用第三人称单数形式。故填varies。4.Tourists考查名词的数。句意:游客可以在春天赏花,在夏天乘凉,在秋天赏红叶,在冬天滑雪。设空处作主语且表示“游客”,应用名词tourist;tourist为可数名词,空前无冠词,且此处泛指游客们,应用复数。故填Tourists。5.and考查连词。句意同上。根据句意和句子结构可知,“enjoyflowerblossomsinspring”“beshadedfromthesummerheat”“appreciateredleavesinautumn”和“goskiinginwinter”之间是并列关系,表示一年四季游客在神农架可以做的事,应用并列连词and连接。故填and。6.building考查动名词。句意:2017年,中国宣布了设立10个保护生态系统的国家公园体制试点的计划,其中包括湖北省神农架林区。介词后接动名词作宾语。故填building。7.reached考查时态。句意:官方数据显示,2020年神农架林区的游客达到了约一千五百五十万人次。分析句子可知,showed后是that引导的宾语从句,设空处为该从句的谓语。根据时间状语in2020可知,动作发生在过去,应用一般过去时。故填reached。8.toincrease考查动词不定式。句意:到2025年,林区力求把那个年度数字提高到三千万以上,旅游收入超过一百亿元。aimtodo...意为“力求做……”,故填toincrease。9.their考查代词。句意:游客如果不驾驶自己的汽车,可以使用公共汽车服务。设空处修饰空后的名词cars,应用形容词性物主代词。故填their。10.a考查冠词。句意:2021年,神农架与一条新建的高速干道相连接,使山区变得更加便利。此处泛指“一条新建的高速干道”,应用不定冠词;newly是辅音音素开头的单词,故填a。【高频词汇】1.encounterv.偶遇;遭遇2.biodiversityn.生物多样性3.shadev.给……遮挡(光线)n.阴凉处;背阴4.employv.使用;应用;雇用5.mountainousadj.多山的6.accessibleadj.可到达的;可进入的;易懂的;平易近人的【熟词生义】coachn.长途客车【差距词汇】1.landformn.地貌;地形2.revenuen.收入;税收Ⅲ.◎语篇解读本文是一篇说明文,主要介绍了研究表明动物传染病的暴发可能归咎于气候变化。1.D细节理解题。根据第二段中的“Inthelasttwodecadesalone,we'vebeenhauntedbyzoonoticoutbreaks,including...callthiseraaPandemicene.”可知,在过去的二十年里,人类深受各种动物传染病暴发带来的困扰,所以这个时代被称为疫情时代。故选D。2.B推理判断题。根据第三段中的“Whenanimalsmigratetowardcoolerclimates,theyintroducevirusestonewenvironments.‘Thatleadstointerestingproblemsfromaviralstandpoint,’saysCarlson.”可知,动物迁徙时会将病毒引入新的环境,而这会导致一些问题的出现。由此可推测出,ColinCarlson可能同意动物的迁徙会导致病毒暴发这一观点。故选B。3.A推理判断题。根据第五段中的“Andwhileit's...evenvirusesforourdistantrelativescanfindpurchaseinus,givenenoughopportunitiesforinfection.”可推测出,在合适的条件下,亲缘关系远的物种之间也能传染病毒。故选A。4.D主旨大意题。通读全文可知,第二段引出本文主题,即气候变化可能是当今动物传染病暴发的罪魁祸首,再结合最后一段(Carlson和他的同事估计,到2070年,将至少有三千例新的跨物种感染病例。不是所有的都会成为流行病,但有些会。)可知,动物传染病将变得越来越严重。全文围绕“动物传染病”展开,表明动物传染病对人类造成了巨大威胁,所以D项(跨物种感染,对人类的巨大威胁)最适合作本文标题。故选D。【高频词汇】1.originatev.起源;来自2.analyzev.分析3.transmitv.传染;传送;传递4.infectionn.感染;传染infectiousadj.传染性的;有感染力的infectv.使感染;传染5.estimatev.估计;估算【熟词生义】1.pairv.配对2.purchasen.握紧;抓牢;蹬稳;支点;抓拿处【差距词汇】1.hauntv.(长期)困扰;缠扰2.standpointn.观点,立场3.densityn.密度;密集;稠密4.immuneadj.有免疫力;免疫的长难句原句Carlsonandhiscolleaguespairedthesepredictionswithamodelthatanalyzeswhydifferentanimalsshareviruses.分析这是一个主从复合句。“Carlsonandhiscolleaguespairedthesepredictionswithamodel”是主句。“thatanalyzeswhydifferentanimalsshareviruses”为that引导的定语从句,修饰先行词model,其中“whydifferentanimalsshareviruses”为why引导的宾语从句,作analyzes的宾语。译文卡尔森和他的同事们将这些预测与一个模型配对,该模型分析了为什么不同的动物共享病毒。Ⅳ.◎语篇解读这是一篇说明文。文章主要讲述了南极洲的冰架正在减少,这可能会使更多的陆地冰流入海洋,从而加速海平面上升。文章还介绍了这一现象的原因可能和气候变化有关。1.B细节句。下文“Theyplayacriticalroleinslowingtheflowoficeonlandintotheocean...acceleratethesealevelrise.”说明了南极冰架在减缓陆地上的冰流入海洋方面的作用。结合选项可知B项(冰架是从陆地冰川延伸出来的巨大的浮冰)引出本段的话题——冰架,并介绍什么是冰架,下文的“They”指代“Iceshelves”,符合语境。故选B。2.A细节句。上文“Healthyiceshelvesnaturallyretreatandgrowovertime.”说明冰架是可以自然消退和增长的。结合选项可知A项(然后它可以从陆地上获得冰并再次生长)承接上文,表明冰架会融化或崩解,也会再次生长,符合语境。A项中“gainicefromthelandandgrowagain”和前文“naturallyretreatandgrowovertime”相呼应,故选A。3.C过渡句。上文“MosticeshelvesinEastAntarcticahowever,increasedinvolumeorstayedthesame.”以及下文“Theregionisprotectedbyabandofcoldwateratthecoast,whichhelpskeepnearbywarmwateratbay.”说明南极东部大部分冰架的体积都在增加或保持不变是因为附近的温暖的海水没有进入。结合选项可知C项(东部不像大陆的另一边那样会接触到温暖的海水)承接上文,说明南极东部大部分冰架的体积都在增加或保持不变的原因,同时引出下文的进一步解释,承上启下,符合语境,故选C。4.F细节句。上文“Evenso,thestudystillshowedpocketsofshrinkingiceshelves,andresearchersarestillinvestigatingthereasons.”说明研究人员仍在调查该区域冰架缩小的原因。结合选项可知F项(一种理论是,西侧温暖的海水可能正在缓慢地涌入该地区)表明调查的一个原因,承接上文,符合语境。F项中的“Onetheory”和前文的“investigating