gre阅读练习每日一篇(二十六)
<p> 掌握了<span word="gre">gre</span>阅读里的长难句，到了实战演习的时候了。<span word="gre">gre</span>阅读练习每日一篇帮助<span word="gre">gre</span>考生循序渐进地进行练习和总结。希望<span word="gre">gre</span>考生在进行<span word="gre">gre</span>阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。</p><p> <span word="The">The</span> <span word="molecules">molecules</span> <span word="of">of</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="in">in</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="atmosphere">atmosphere</span> <span word="affect">affect</span> <span word="the">the</span> <span word="heat">heat</span> <span word="balance">balance</span> <span word="of">of</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="by">by</span> <span word="acting">acting</span> <span word="as">as</span> <span word="a">a</span> <span word="one">one</span>-<span word="way">way</span> <span word="screen">screen</span>. <span word="Although">Although</span> <span word="these">these</span> <span word="molecules">molecules</span> <span word="allow">allow</span> <span word="radiation">radiation</span> <span word="at">at</span> <span word="visible">visible</span> <span word="wavelengths">wavelengths</span>, <span word="where">where</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="energy">energy</span> <span word="of">of</span> <span word="sunlight">sunlight</span> <span word="is">is</span> <span word="concentrated">concentrated</span>, <span word="to">to</span> <span word="pass">pass</span> <span word="through">through</span>, <span word="they">they</span> <span word="absorb">absorb</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="longer">longer</span>-<span word="wavelength">wavelength</span>, <span word="infrared">infrared</span> <span word="emissions">emissions</span> <span word="radiated">radiated</span> <span word="from">from</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="surface">surface</span>, <span word="radiation">radiation</span> <span word="that">that</span> <span word="would">would</span> <span word="otherwise">otherwise</span> <span word="be">be</span> <span word="transmitted">transmitted</span> <span word="back">back</span> <span word="into">into</span> <span word="space">space</span>. <span word="For">For</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="to">to</span> <span word="maintain">maintain</span> <span word="a">a</span> <span word="constant">constant</span> <span word="average">average</span> <span word="temperature">temperature</span>, <span word="such">such</span> <span word="emissions">emissions</span> <span word="from">from</span> <span word="the">the</span> <span word="planet">planet</span> <span word="must">must</span> <span word="balance">balance</span> <span word="incoming">incoming</span> <span word="solar">solar</span> <span word="radiation">radiation</span>. <span word="If">If</span> <span word="there">there</span> <span word="were">were</span> <span word="no">no</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="in">in</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span>, <span word="heat">heat</span> <span word="would">would</span> <span word="escape">escape</span> <span word="from">from</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="much">much</span> <span word="more">more</span> <span word="easily">easily</span>. <span word="The">The</span> <span word="surface">surface</span> <span word="temperature">temperature</span> <span word="would">would</span> <span word="be">be</span> <span word="so">so</span> <span word="much">much</span> <span word="lower">lower</span> <span word="that">that</span> <span word="the">the</span> <span word="oceans">oceans</span> <span word="might">might</span> <span word="be">be</span> <span word="a">a</span> <span word="solid">solid</span> <span word="mass">mass</span> <span word="of">of</span> <span word="ice">ice</span>.</p><p> <span word="Today">Today</span>, <span word="however">however</span>, <span word="the">the</span> <span word="potential">potential</span> <span word="problem">problem</span> <span word="is">is</span> <span word="too">too</span> <span word="much">much</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span>. <span word="The">The</span> <span word="burning">burning</span> <span word="of">of</span> <span word="fossil">fossil</span> <span word="fuels">fuels</span> <span word="and">and</span> <span word="the">the</span> <span word="clearing">clearing</span> <span word="of">of</span> <span word="forests">forests</span> <span word="have">have</span> <span word="increased">increased</span> <span word="atmospheric">atmospheric</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="by">by</span> <span word="about">about</span> 15 <span word="percent">percent</span> <span word="in">in</span> <span word="the">the</span> <span word="last">last</span> <span word="hundred">hundred</span> <span word="years">years</span>, <span word="and">and</span> <span word="we">we</span> <span word="continue">continue</span> <span word="to">to</span> <span word="add">add</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="to">to</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span>. <span word="Could">Could</span> <span word="the">the</span> <span word="increase">increase</span> <span word="in">in</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="cause">cause</span> <span word="a">a</span> <span word="global">global</span> <span word="rise">rise</span> <span word="in">in</span> <span word="average">average</span> <span word="temperature">temperature</span>, <span word="and">and</span> <span word="could">could</span> <span word="such">such</span> <span word="a">a</span> <span word="rise">rise</span> <span word="have">have</span> <span word="serious">serious</span> <span word="consequences">consequences</span> <span word="for">for</span> <span word="human">human</span> <span word="society">society</span>? <span word="Mathematical">Mathematical</span> <span word="models">models</span> <span word="that">that</span> <span word="allow">allow</span> <span word="us">us</span> <span word="to">to</span> <span word="calculate">calculate</span> <span word="the">the</span> <span word="rise">rise</span> <span word="in">in</span> <span word="temperature">temperature</span> <span word="as">as</span> <span word="a">a</span> <span word="function">function</span> <span word="of">of</span> <span word="the">the</span> <span word="increase">increase</span> <span word="indicate">indicate</span> <span word="that">that</span> <span word="the">the</span> <span word="answer">answer</span> <span word="is">is</span> <span word="probably">probably</span> <span word="yes">yes</span>.</p>
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