GRE写作范文——Cells and Temperature
<p> <span word="Cells">Cells</span> <span word="cannot">cannot</span> <span word="remain">remain</span> <span word="alive">alive</span> <span word="outside">outside</span> <span word="certain">certain</span> <span word="limits">limits</span> <span word="of">of</span> <span word="temperature">temperature</span> <span word="and">and</span> <span word="much">much</span> <span word="narrower">narrower</span> <span word="limits">limits</span> <span word="mark">mark</span> <span word="the">the</span> <span word="boundaries">boundaries</span> <span word="of">of</span> <span word="effective">effective</span> <span word="functioning">functioning</span>. <span word="Enzyme">Enzyme</span> <span word="systems">systems</span> <span word="of">of</span> <span word="mammals">mammals</span> <span word="and">and</span> <span word="birds">birds</span> <span word="are">are</span> <span word="most">most</span> <span word="efficient">efficient</span> <span word="only">only</span> <span word="within">within</span> <span word="a">a</span> <span word="narrow">narrow</span> <span word="range">range</span> <span word="around">around</span> 37<span word="C">C</span>;<span word="a">a</span> <span word="departure">departure</span> <span word="of">of</span> <span word="a">a</span> <span word="few">few</span> <span word="degrees">degrees</span> <span word="from">from</span> <span word="this">this</span> <span word="value">value</span> <span word="seriously">seriously</span> <span word="impairs">impairs</span> <span word="their">their</span> <span word="functioning">functioning</span>. <span word="Even">Even</span> <span word="though">though</span> <span word="cells">cells</span> <span word="can">can</span> <span word="survive">survive</span> <span word="wider">wider</span> <span word="fluctuations">fluctuations</span> <span word="the">the</span> <span word="integrated">integrated</span> <span word="actions">actions</span> <span word="of">of</span> <span word="bodily">bodily</span> <span word="systems">systems</span> <span word="are">are</span> <span word="impaired">impaired</span>. <span word="Other">Other</span> <span word="animals">animals</span> <span word="have">have</span> <span word="a">a</span> <span word="wider">wider</span> <span word="tolerance">tolerance</span> <span word="for">for</span> <span word="changes">changes</span> <span word="of">of</span> <span word="bodily">bodily</span> <span word="temperature">temperature</span>.</p><p> <span word="For">For</span> <span word="centuries">centuries</span> <span word="it">it</span> <span word="has">has</span> <span word="been">been</span> <span word="recognized">recognized</span> <span word="that">that</span> <span word="mammals">mammals</span> <span word="and">and</span> <span word="birds">birds</span> <span word="differ">differ</span> <span word="from">from</span> <span word="other">other</span> <span word="animals">animals</span> <span word="in">in</span> <span word="the">the</span> <span word="way">way</span> <span word="they">they</span> <span word="regulate">regulate</span> <span word="body">body</span> <span word="temperature">temperature</span>. <span word="Ways">Ways</span> <span word="of">of</span> <span word="characterizing">characterizing</span> <span word="the">the</span> <span word="difference">difference</span> <span word="have">have</span> <span word="become">become</span> <span word="more">more</span> <span word="accurate">accurate</span> <span word="and">and</span> <span word="meaningful">meaningful</span> <span word="over">over</span> <span word="time">time</span>, <span word="but">but</span> <span word="popular">popular</span> <span word="terminology">terminology</span> <span word="still">still</span> <span word="reflects">reflects</span> <span word="the">the</span> <span word="old">old</span> <span word="division">division</span> <span word="into">into</span> <span word="warm">warm</span>-<span word="blooded">blooded</span> <span word="and">and</span> <span word="cold">cold</span>-<span word="blooded">blooded</span> <span word="species">species</span>; <span word="warm">warm</span>-<span word="blooded">blooded</span> <span word="included">included</span> <span word="mammals">mammals</span> <span word="and">and</span> <span word="birds">birds</span> <span word="whereas">whereas</span> <span word="all">all</span> <span word="other">other</span> <span word="creatures">creatures</span> <span word="were">were</span> <span word="considered">considered</span> <span word="cold">cold</span>- <span word="blooded">blooded</span>.</p><p> <span word="As">As</span> <span word="more">more</span> <span word="species">species</span> <span word="were">were</span> <span word="studied">studied</span>, <span word="it">it</span> <span word="became">became</span> <span word="evident">evident</span> <span word="that">that</span> <span word="this">this</span> <span word="classification">classification</span> <span word="was">was</span> <span word="inadequate">inadequate</span>. <span word="A">A</span> <span word="fence">fence</span> <span word="lizard">lizard</span> <span word="or">or</span> <span word="a">a</span> <span word="desert">desert</span> <span word="iguana">iguana</span>-<span word="each">each</span> <span word="cold">cold</span>-<span word="blooded">blooded</span>----<span word="usually">usually</span> <span word="has">has</span> <span word="a">a</span> <span word="body">body</span> <span word="temperature">temperature</span> <span word="only">only</span> <span word="a">a</span> <span word="degree">degree</span> <span word="or">or</span> <span word="two">two</span> <span word="below">below</span> <span word="that">that</span> <span word="of">of</span> <span word="humans">humans</span> <span word="and">and</span> <span word="so">so</span> <span word="is">is</span> <span word="not">not</span> <span word="cold">cold</span>. <span word="Therefore">Therefore</span> <span word="the">the</span> <span word="next">next</span> <span word="distinction">distinction</span> <span word="was">was</span> <span word="made">made</span> <span word="between">between</span> <span word="animals">animals</span> <span word="that">that</span> <span word="maintain">maintain</span> <span word="a">a</span> <span word="constant">constant</span> <span word="body">body</span> <span word="temperature">temperature</span>, <span word="called">called</span> <span word="home">home</span>0<span word="therms">therms</span>, <span word="and">and</span> <span word="those">those</span> <span word="whose">whose</span> <span word="body">body</span> <span word="temperature">temperature</span> <span word="varies">varies</span> <span word="with">with</span> <span word="their">their</span> <span word="environments">environments</span>, <span word="called">called</span> <span word="poikilotherms">poikilotherms</span>. <span word="But">But</span> <span word="this">this</span> <span word="classification">classification</span> <span word="also">also</span> <span word="proved">proved</span> <span word="inadequate">inadequate</span>, <span word="because">because</span> <span word="among">among</span> <span word="mammals">mammals</span> <span word="there">there</span> <span word="are">are</span> <span word="many">many</span> <span word="that">that</span> <span word="vary">vary</span> <span word="their">their</span> <span word="body">body</span> <span word="temperatures">temperatures</span> <span word="during">during</span> <span word="hibernation">hibernation</span>.</p>
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