2015年考研英语作文素材精选 五
<p> 2015考研英语作文素材精选</p><p> 17.<span word="Evolution">Evolution</span> <span word="of">of</span> <span word="sleep">sleep</span></p><p> <span word="Sleep">Sleep</span> <span word="is">is</span> <span word="very">very</span> <span word="ancient">ancient</span>. <span word="In">In</span> <span word="the">the</span> <span word="electroencephalographic">electroencephalographic</span> <span word="sense">sense</span> <span word="we">we</span> <span word="share">share</span> <span word="it">it</span> <span word="with">with</span> <span word="all">all</span> <span word="the">the</span> <span word="primates">primates</span> <span word="and">and</span> <span word="almost">almost</span> <span word="all">all</span> <span word="the">the</span> <span word="other">other</span> <span word="mammals">mammals</span> <span word="and">and</span> <span word="birds">birds</span>: <span word="it">it</span> <span word="may">may</span> <span word="extend">extend</span> <span word="back">back</span> <span word="as">as</span> <span word="far">far</span> <span word="as">as</span> <span word="the">the</span> <span word="reptiles">reptiles</span>.</p><p> <span word="There">There</span> <span word="is">is</span> <span word="some">some</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="the">the</span> <span word="two">two</span> <span word="types">types</span> <span word="of">of</span> <span word="sleep">sleep</span>, <span word="dreaming">dreaming</span> <span word="and">and</span> <span word="dreamless">dreamless</span>, <span word="depend">depend</span> <span word="on">on</span> <span word="the">the</span> <span word="life">life</span>-<span word="style">style</span> <span word="of">of</span> <span word="the">the</span> <span word="animal">animal</span>, <span word="and">and</span> <span word="that">that</span> <span word="predators">predators</span> <span word="are">are</span> <span word="statistically">statistically</span> <span word="much">much</span> <span word="more">more</span> <span word="likely">likely</span> <span word="to">to</span> <span word="dream">dream</span> <span word="than">than</span> <span word="prey">prey</span>, <span word="which">which</span> <span word="are">are</span> <span word="in">in</span> <span word="turn">turn</span> <span word="much">much</span> <span word="more">more</span> <span word="likely">likely</span> <span word="to">to</span> <span word="experience">experience</span> <span word="dreamless">dreamless</span> <span word="sleep">sleep</span>. <span word="In">In</span> <span word="dream">dream</span> <span word="sleep">sleep</span>, <span word="the">the</span> <span word="animal">animal</span> <span word="is">is</span> <span word="powerfully">powerfully</span> <span word="immobilized">immobilized</span> <span word="and">and</span> <span word="remarkably">remarkably</span> <span word="unresponsive">unresponsive</span> <span word="to">to</span> <span word="external">external</span> <span word="stimuli">stimuli</span>. <span word="Dreamless">Dreamless</span> <span word="sleep">sleep</span> <span word="is">is</span> <span word="much">much</span> <span word="shallower">shallower</span>, <span word="and">and</span> <span word="we">we</span> <span word="have">have</span> <span word="all">all</span> <span word="witnessed">witnessed</span> <span word="cats">cats</span> <span word="or">or</span> <span word="dogs">dogs</span> <span word="cocking">cocking</span> <span word="their">their</span> <span word="ears">ears</span> <span word="to">to</span> <span word="a">a</span> <span word="sound">sound</span> <span word="when">when</span> <span word="apparently">apparently</span> <span word="fast">fast</span> <span word="asleep">asleep</span>. <span word="The">The</span> <span word="fact">fact</span> <span word="that">that</span> <span word="deep">deep</span> <span word="dream">dream</span> <span word="sleep">sleep</span> <span word="is">is</span> <span word="rare">rare</span> <span word="among">among</span> <span word="pray">pray</span> <span word="today">today</span> <span word="seems">seems</span> <span word="clearly">clearly</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> <span word="product">product</span> <span word="of">of</span> <span word="natural">natural</span> <span word="selection">selection</span>, <span word="and">and</span> <span word="it">it</span> <span word="makes">makes</span> <span word="sense">sense</span> <span word="that">that</span> <span word="today">today</span>, <span word="when">when</span> <span word="sleep">sleep</span> <span word="is">is</span> <span word="highly">highly</span> <span word="evolved">evolved</span>, <span word="the">the</span> <span word="stupid">stupid</span> <span word="animals">animals</span> <span word="are">are</span> <span word="less">less</span> <span word="frequently">frequently</span> <span word="immobilized">immobilized</span> <span word="by">by</span> <span word="deep">deep</span> <span word="sleep">sleep</span> <span word="than">than</span> <span word="the">the</span> <span word="smart">smart</span> <span word="ones">ones</span>. <span word="But">But</span> <span word="why">why</span> <span word="should">should</span> <span word="they">they</span> <span word="sleep">sleep</span> <span word="deeply">deeply</span> <span word="at">at</span> <span word="all">all</span>? <span word="Why">Why</span> <span word="should">should</span> <span word="a">a</span> <span word="state">state</span> <span word="of">of</span> <span word="such">such</span> <span word="deep">deep</span> <span word="immobilization">immobilization</span> <span word="ever">ever</span> <span word="have">have</span> <span word="evolved">evolved</span>?</p><p> <span word="Perhaps">Perhaps</span> <span word="one">one</span> <span word="useful">useful</span> <span word="hint">hint</span> <span word="about">about</span> <span word="the">the</span> <span word="original">original</span> <span word="function">function</span> <span word="of">of</span> <span word="sleep">sleep</span> <span word="is">is</span> <span word="to">to</span> <span word="be">be</span> <span word="found">found</span> <span word="in">in</span> <span word="the">the</span> <span word="fact">fact</span> <span word="that">that</span> <span word="dolphins">dolphins</span> <span word="and">and</span> <span word="whales">whales</span> <span word="and">and</span> <span word="aquatic">aquatic</span> <span word="mammals">mammals</span> <span word="in">in</span> <span word="genera">genera</span> <span word="seem">seem</span> <span word="to">to</span> <span word="sleep">sleep</span> <span word="very">very</span> <span word="little">little</span>. <span word="There">There</span> <span word="is">is</span>, <span word="by">by</span> <span word="and">and</span> <span word="large">large</span>, <span word="no">no</span> <span word="place">place</span> <span word="to">to</span> <span word="hide">hide</span> <span word="in">in</span> <span word="the">the</span> <span word="ocean">ocean</span>. <span word="Could">Could</span> <span word="it">it</span> <span word="be">be</span> <span word="that">that</span>, <span word="rather">rather</span> <span word="than">than</span> <span word="increasing">increasing</span> <span word="an">an</span> <span word="animals">animals</span> <span word="vulnerability">vulnerability</span>, <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Florida">Florida</span> <span word="and">and</span> <span word="Ray">Ray</span> <span word="Meddis">Meddis</span> <span word="of">of</span> <span word="London">London</span> <span word="University">University</span> <span word="have">have</span> <span word="suggested">suggested</span> <span word="this">this</span> <span word="to">to</span> <span word="be">be</span> <span word="the">the</span> <span word="case">case</span>. <span word="It">It</span> <span word="is">is</span> <span word="conceivable">conceivable</span> <span word="that">that</span> <span word="animals">animals</span> <span word="who">who</span> <span word="are">are</span> <span word="too">too</span> <span word="stupid">stupid</span> <span word="to">to</span> <span word="be">be</span> <span word="quite">quite</span> <span word="on">on</span> <span word="their">their</span> <span word="own">own</span> <span word="initiative">initiative</span> <span word="are">are</span>, <span word="during">during</span> <span word="periods">periods</span> <span word="of">of</span> <span word="high">high</span> <span word="risk">risk</span>, <span word="immobilized">immobilized</span> <span word="by">by</span> <span word="the">the</span> <span word="implacable">implacable</span> <span word="arm">arm</span> <span word="of">of</span> <span word="sleep">sleep</span>. <span word="The">The</span> <span word="point">point</span> <span word="seems">seems</span> <span word="particularly">particularly</span> <span word="clear">clear</span> <span word="for">for</span> <span word="the">the</span> <span word="young">young</span> <span word="of">of</span> <span word="predatory">predatory</span> <span word="animals">animals</span>. <span word="This">This</span> <span word="is">is</span> <span word="an">an</span> <span word="interesting">interesting</span> <span word="notion">notion</span> <span word="and">and</span> <span word="probably">probably</span> <span word="at">at</span> <span word="least">least</span> <span word="partly">partly</span> <span word="true">true</span>.</p>
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