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雅思阅读真题重点推荐：Otters水獭READINGPASSAGE1Youshouldspendabout20minutesonQuestions1-13,whicharebasedonReadingPassage1below.A)Ottersarescmiaqualic(orinthecaseoftheseaotter,aquatic)monirnals.rHieyuremi'inbersoftheMustelidfamilywhichincludesbadgers,polecats,martens,weasels,stoatsanhaveinluibitedtheearthforthelast30millionyearsandovertheyearshaveundergonesubtlechangestothecarnivorebodiestoexploittherichaquaticenvironment.Ottershavelongliiinbodyandshortlegs~idealforpushingdenseundergrowthorhuntingintunnels.Anadultmalemaybeupto4feetlongand30pounds.Femalesaresmaller,around16poundstypically.TheEurasianotternoseisaboutihcsmallestamongtheotterspeciesandhasacharacteristicshapedescribedasashidlow"W".Anotter'stail(orrudder,orstern)isstoulattliebaseandtaperstowardsthetipwhereilflattens.ITiisformspartofthepropulsionunitwhenswimmingfastunderwater.Oderfurconsistsofiwotypesofhair:stoutguardhairswhichformawaterproofoutercovering,andundcrfiirwhichisdenseandfine，equivalenttoanotter'sthermalunderwear.Thefurmusthekeptingoodconditionbygrooming.Seawaterreducesthewaterproofingandinsulatingqualitiesofotterfurwhensaltwatergetsinthefur.Thisiswhyfreshwaterpoolsareimportanttootterslivingonthecoast.Afterswimming,theywashthesaltsofTinthepoolsandthensquirmonthegroundtorubdryagainstvegetation.B)Scentisusedforhuntingonland,forcommunicationandfordetectingdanger.Otterinesenseofsmellislikelytosimilarinsensitivitytodogs.Ottershavesmalleyesandarcprobablyshort-siglitedonland.Buitheydohavetheabilitytomodifytheshapeofthelensintheeyetomakeitmorespherical,andhenceovercometherefractionofwaterInclearwaterandgoodliglit,otterscanhuntfishbysight.Theotter'seyesandnostrilsareplacedhighonitsheadsothatitc-anseeandbreulhcovenwhentherestofdiebodyissubmerg'd,"Thelongwhiskersgrowingiinmndthemuzzleareusedtodetectthepresenceoffish.Theydetectregularvihrutionscruisedbythebeatofthefish'stailasitswimsawuy.I'histdlowsotterstohunteveninverymurkywater.Underwater,theotterholdsitslegsagainstthebody,exceptforsteering,andthehindendofthebodyisf
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