- 阅读理解A
题干：Intheirworldofdarkness,itwouldseemlikelythatsomeoftheanimalsmighthavebecomeblind,ashashappenedtosomecavefauna.So,indeed,manyofthemhave,compensatingforthelackofeyeswithmarvelouslydevelopedfeelersandlong,slenderfinsandprocesseswithwhichtheygropetheirway,likesomanyblindmenwithcanes,theirwholeknowledgeoffriends,enemies,orfoodcomingtothemthroughthesenseoftouch.Thelasttracesofplantlifeareleftbehindinthethinupperlayerofwater,fornoplantcanlivebelowabout600feeteveninveryclearwater,andfewfindenoughsunlightfortheirfood-manufacturingactivitiesbelow200feet.Sincenoanimalcanmakeitsownfood,thecreaturesofthedeeperwatersliveastrange,almostparasiticexistenceofutterdependenceontheupperlayers.Thesehungrycarnivorespreyfiercelyandrelentlesslyuponeachother,yetthewholecommunityisultimatelydependentupontheslowrainofdescendingfoodparticlesfromabove.Thecomponentsofthisnever-endingrainarethedeadanddyingplantsandanimalsfromthesurface,orfromoneoftheintermediatelayers.Foreachofthehorizontalzonesorcommunitiesoftheseathatliebetweenthesurfaceandtheseabottom,thefoodsupplyisdifferentandingeneralpoorerthanforthelayerabove.Pressure,darkness,andsilencearetheconditionsoflifeinthedeepsea.Butweknownowthattheconceptionoftheseaasasilentplaceiswhollyfalse.Wideexperiencewithhydrophonesandotherlisteningdevicesforthedetectionofsubmarineshasprovedthat,aroundtheshorelinesofmuchoftheworld,thereistheextraordinaryuproarproducedbyfishes,shrimps,porpoisesandprobablyotherformsnotyetidentified.Therehasbeenlittleinvestigationasyetofsoundinthedeep,offshoreareas,butwhenthecrewoftheAtlantisloweredahydrophoneintodeepwateroffBermuda,theyrecordedstrangemewingsounds,shrieks,andghostlymoans,thesourcesofwhichhavenotbeentraced.Butfishofshallowerzoneshavebeencapturedandconfinedinaquaria,wheretheirvoiceshavebeenrecordedforcomparisonwithsoundsheardatsea,andinmanycasessatisfactoryidentificationcanbemade.DuringtheSecondWorldWarthehydrophonenetworksetupbytheUnitedStatesNavytoprotecttheentrancetoChesapeakeBaywastemporarilymadeuselesswhen,inthespringof1942,thespeakersatthesurfacebegantogiveforth,everyevening,asounddescribedasbeinglike“apneumaticdrilltearinguppavement”.Theextraneousnoisesthatcameoverthehydrophonescompletelymaskedthesoundsofthepassageofships.Eventuallyitwasdiscoveredthatthesoundswerethevoicesoffishknownascroakers,whichinthespringmoveintoChesapeakeBayfromtheoffshorewinteringgrounds.Assoonasthenoisehadbeenidentifiedandanalyzed,itwaspossibletoscreenitoutwithanelectricfilter,sothatoncemoreonlythesoundsofshipscamethroughthespeakers.
题目： Animals that live near the bottom of the sea are most likely to be carnivorous because（）. - A 、they have developed sharp teeth and strong jaws with which to kill their prey
- B 、plants that grow far below the surface are not edible
- C 、animals cannot make their own food, so they eat each other
- D 、most surface vegetation is eaten before it sinks to the bottom of the sea
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参考答案【正确答案：C】
第二段提到，海中的植物只生存于海水的表层，在600英尺的海下，即使水色清清，植物也不能生存。几乎没有植物能生存于200英尺以下，因为那里不再有光合作用使它们获得养分。既然水下动物不能自行制造食物，深水中的鱼类完全靠上层生存，过着奇怪，甚至可以说是寄生的生活。这些饥饿的食肉动物凶猛而残忍地蚕食同类，但是，整个生活于深水中的鱼类却最终靠的是从上层缓缓落下的食物求得生存。
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