英语六级考试备考晨读美文——Marine Mammals
<p> <span word="Marine">Marine</span> <span word="Mammals">Mammals</span></p><p> <span word="Since">Since</span> <span word="there">there</span> <span word="is">is</span> <span word="such">such</span> <span word="an">an</span> <span word="abundance">abundance</span> <span word="of">of</span> <span word="food">food</span> <span word="in">in</span> <span word="the">the</span> <span word="sea">sea</span>, <span word="it">it</span> <span word="is">is</span> <span word="understandable">understandable</span> <span word="that">that</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="efficient">efficient</span>, <span word="highly">highly</span> <span word="adaptable">adaptable</span>, <span word="warm">warm</span>-<span word="blooded">blooded</span> <span word="mammals">mammals</span> <span word="that">that</span> <span word="evolved">evolved</span> <span word="on">on</span> <span word="land">land</span> <span word="should">should</span> <span word="have">have</span> <span word="returned">returned</span> <span word="to">to</span> <span word="the">the</span> <span word="sea">sea</span>. <span word="Those">Those</span> <span word="that">that</span> <span word="did">did</span> <span word="have">have</span> <span word="flourished">flourished</span>. <span word="Within">Within</span> <span word="about">about</span> 50 <span word="million">million</span> <span word="years">years</span> -- <span word="no">no</span> <span word="time">time</span> <span word="at">at</span> <span word="all">all</span>, <span word="geologically">geologically</span> <span word="speaking">speaking</span> -- <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="four">four</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="mammals">mammals</span> <span word="that">that</span> <span word="has">has</span> <span word="returned">returned</span> <span word="to">to</span> <span word="a">a</span> <span word="marine">marine</span> <span word="environment">environment</span> <span word="has">has</span> <span word="developed">developed</span> <span word="into">into</span> <span word="the">the</span> <span word="largest">largest</span> <span word="of">of</span> <span word="all">all</span> <span word="animal">animal</span> <span word="forms">forms</span>, <span word="the">the</span> <span word="whale">whale</span>. <span word="A">A</span> <span word="second">second</span> <span word="kind">kind</span>, <span word="the">the</span> <span word="seal">seal</span>, <span word="has">has</span> <span word="produced">produced</span> <span word="what">what</span> <span word="is">is</span> <span word="probably">probably</span> <span word="the">the</span> <span word="greatest">greatest</span> <span word="population">population</span> <span word="of">of</span> <span word="large">large</span> <span word="carnivorous">carnivorous</span> <span word="mammals">mammals</span> <span word="on">on</span> <span word="Earth">Earth</span>. <span word="This">This</span> <span word="suggests">suggests</span> <span word="that">that</span> <span word="these">these</span> <span word="top">top</span> <span word="dogs">dogs</span> <span word="of">of</span> <span word="the">the</span> <span word="ocean">ocean</span> <span word="are">are</span> <span word="prospering">prospering</span> <span word="and">and</span> <span word="multiplying">multiplying</span>. <span word="However">However</span>, <span word="such">such</span> <span word="has">has</span> <span word="not">not</span> <span word="been">been</span> <span word="the">the</span> <span word="case">case</span>, <span word="at">at</span> <span word="least">least</span> <span word="not">not</span> <span word="for">for</span> <span word="the">the</span> <span word="last">last</span> 150 <span word="years">years</span>. <span word="Trouble">Trouble</span> <span word="has">has</span> <span word="closed">closed</span> <span word="in">in</span> <span word="on">on</span> <span word="these">these</span> <span word="mammals">mammals</span> <span word="in">in</span> <span word="the">the</span> <span word="form">form</span> <span word="of">of</span> <span word="equally">equally</span> <span word="warm">warm</span>-<span word="blooded">blooded</span> <span word="and">and</span> <span word="even">even</span> <span word="more">more</span> <span word="efficient">efficient</span> <span word="and">and</span> <span word="adaptable">adaptable</span> <span word="predators">predators</span>, <span word="humans">humans</span>. <span word="At">At</span> <span word="sea">sea</span>, <span word="as">as</span> <span word="on">on</span> <span word="land">land</span>, <span word="humans">humans</span> <span word="have">have</span> <span word="now">now</span> <span word="positioned">positioned</span> <span word="themselves">themselves</span> <span word="on">on</span> <span word="the">the</span> <span word="top">top</span> <span word="of">of</span> <span word="the">the</span> <span word="whole">whole</span> <span word="great">great</span> <span word="pyramid">pyramid</span> <span word="of">of</span> <span word="life">life</span>, <span word="and">and</span> <span word="they">they</span> <span word="have">have</span> <span word="caused">caused</span> <span word="serious">serious</span> <span word="problems">problems</span> <span word="for">for</span> <span word="the">the</span> <span word="mammals">mammals</span> <span word="of">of</span> <span word="the">the</span> <span word="sea">sea</span>. <span word="There">There</span> <span word="is">is</span> <span word="a">a</span> <span word="simple">simple</span> <span word="reason">reason</span> <span word="for">for</span> <span word="this">this</span>. <span word="Marine">Marine</span> <span word="mammals">mammals</span> <span word="have">have</span> <span word="the">the</span> <span word="misfortune">misfortune</span> <span word="to">to</span> <span word="be">be</span> <span word="swimming">swimming</span> <span word="aggregates">aggregates</span> <span word="of">of</span> <span word="commodities">commodities</span> <span word="that">that</span> <span word="humans">humans</span> <span word="want">want</span>: <span word="fur">fur</span>, <span word="oil">oil</span> <span word="and">and</span> <span word="meat">meat</span>. <span word="Even">Even</span> <span word="so">so</span>, <span word="they">they</span> <span word="might">might</span> <span word="not">not</span> <span word="be">be</span> <span word="so">so</span> <span word="vulnerable">vulnerable</span> <span word="to">to</span> <span word="human">human</span> <span word="depredation">depredation</span> <span word="if">if</span> <span word="they">they</span> <span word="did">did</span> <span word="not">not</span>, <span word="like">like</span> <span word="humans">humans</span>, <span word="reproduce">reproduce</span> <span word="so">so</span> <span word="slowly">slowly</span>. <span word="Every">Every</span> <span word="year">year</span> <span word="humans">humans</span> <span word="take">take</span> <span word="more">more</span> <span word="than">than</span> 50 <span word="million">million</span> <span word="tons">tons</span> <span word="of">of</span> <span word="fish">fish</span> <span word="from">from</span> <span word="the">the</span> <span word="oceans">oceans</span> <span word="without">without</span> <span word="critically">critically</span> <span word="depleting">depleting</span> <span word="the">the</span> <span word="population">population</span> <span word="of">of</span> <span word="any">any</span> <span word="species">species</span>. <span word="But">But</span> <span word="the">the</span> <span word="slow">slow</span>-<span word="breeding">breeding</span> <span word="mammals">mammals</span> <span word="of">of</span> <span word="the">the</span> <span word="sea">sea</span> <span word="have">have</span> <span word="been">been</span> <span word="all">all</span> <span word="but">but</span> <span word="wiped">wiped</span> <span word="out">out</span> <span word="by">by</span> <span word="humans">humans</span> <span word="seeking">seeking</span> <span word="to">to</span> <span word="satisfy">satisfy</span> <span word="their">their</span> <span word="wants">wants</span> <span word="and">and</span> <span word="whims">whims</span>.</p>
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