职称英语理工类阅读理解原文版练习(7)
<p> <span word="Plant">Plant</span> <span word="Gas">Gas</span> <span word="Previously">Previously</span>，<span word="researchers">researchers</span> <span word="had">had</span> <span word="thought">thought</span> <span word="that">that</span> <span word="it">it</span> <span word="was">was</span> <span word="impossible">impossible</span> <span word="for">for</span> <span word="plants">plants</span> <span word="to">to</span> <span word="make">make</span> <span word="significant">significant</span> <span word="amounts">amounts</span> <span word="of">of</span> <span word="the">the</span> <span word="gas">gas</span>.<span word="They">They</span> <span word="had">had</span> <span word="assumed">assumed</span> <span word="that">that</span>，<span word="microbes">microbes</span>2 <span word="need">need</span> <span word="to">to</span> <span word="be">be</span> <span word="in">in</span> <span word="environments">environments</span> <span word="without">without</span> <span word="oxygen">oxygen</span> <span word="to">to</span> <span word="produce">produce</span> <span word="methane">methane</span>.<span word="Methane">Methane</span> <span word="is">is</span> <span word="a">a</span> <span word="greenhouse">greenhouse</span> <span word="gas">gas</span>，<span word="like">like</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span>.<span word="Gases">Gases</span> <span word="such">such</span> <span word="as">as</span> <span word="methane">methane</span> <span word="and">and</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="trap">trap</span> <span word="heat">heat</span> <span word="in">in</span> <span word="Earths">Earths</span> <span word="atmosphere">atmosphere</span> <span word="and">and</span> <span word="contributeto">contributeto</span> <span word="global">global</span> <span word="warming">warming</span>. <span word="With">With</span> <span word="the">the</span> <span word="dried">dried</span> <span word="plants">plants</span>，<span word="the">the</span> <span word="researchers">researchers</span> <span word="took">took</span> <span word="measurement">measurement</span> <span word="at">at</span> <span word="temperatures">temperatures</span> <span word="ranging">ranging</span> <span word="from">from</span> 30 <span word="degrees">degrees</span> <span word="Celsius">Celsius</span> <span word="to">to</span> 70 <span word="degrees">degrees</span> <span word="C">C</span>.<span word="At">At</span> 30 <span word="degrees">degrees</span> <span word="C">C</span>，<span word="they">they</span> <span word="found">found</span>，<span word="a">a</span> <span word="gram">gram</span> <span word="of">of</span> <span word="dried">dried</span> <span word="plant">plant</span> <span word="material">material</span> <span word="released">released</span> <span word="up">up</span> <span word="to">to</span> 3 <span word="nanograms">nanograms</span> <span word="of">of</span> <span word="methane">methane</span> <span word="per">per</span> <span word="hour">hour</span>. <span word="With">With</span> <span word="every">every</span> 10-<span word="degree">degree</span> <span word="rise">rise</span> <span word="in">in</span> <span word="temperature">temperature</span>，<span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="methane">methane</span> <span word="released">released</span> <span word="each">each</span> <span word="hour">hour</span> <span word="roughly">roughly</span> <span word="doubled">doubled</span>. <span word="Beeause">Beeause</span> <span word="there">there</span> <span word="was">was</span> <span word="plenty">plenty</span> <span word="of">of</span> <span word="oxygen">oxygen</span> <span word="available">available</span>，<span word="its">its</span> <span word="unlikely">unlikely</span> <span word="that">that</span> <span word="the">the</span> <span word="types">types</span> <span word="of">of</span> <span word="bacteria">bacteria</span> <span word="that">that</span> <span word="normally">normally</span> <span word="make">make</span> <span word="methane">methane</span> <span word="were">were</span> <span word="involved">involved</span>. <span word="Experiments">Experiments</span> <span word="on">on</span> <span word="plants">plants</span> <span word="that">that</span> <span word="weregrown">weregrown</span> <span word="in">in</span> <span word="water">water</span> <span word="rather">rather</span> <span word="than">than</span> <span word="soil">soil</span> <span word="also">also</span> <span word="resulted">resulted</span> <span word="in">in</span> <span word="methane">methane</span> <span word="emissions">emissions</span>.<span word="Thats">Thats</span> <span word="another">another</span> <span word="strong">strong</span> <span word="sign">sign</span> <span word="that">that</span> <span word="the">the</span> <span word="gas">gas</span> <span word="came">came</span> <span word="from">from</span> <span word="the">the</span> <span word="plants">plants</span> <span word="and">and</span> <span word="not">not</span> <span word="soil">soil</span> <span word="microbes">microbes</span>. 注释： <span word="microbe">microbe</span>：细菌，意义同<span word="bacterium">bacterium</span>。但<span word="microbe">microbe</span>不用作专门术语。 练习： <span word="A">A</span> <span word="h">h</span> <span word="was">was</span> <span word="produced">produced</span> <span word="from">from</span> <span word="plants">plants</span>． <span word="C">C</span> <span word="It">It</span> <span word="was">was</span> <span word="produced">produced</span> <span word="in">in</span> <span word="oxygen">oxygen</span>-<span word="free">free</span> <span word="environments">environments</span>． <span word="To">To</span> <span word="test">test</span> <span word="whether">whether</span> <span word="plants">plants</span> <span word="are">are</span> <span word="a">a</span> <span word="sot">sot</span>，<span word="roe">roe</span> <span word="of">of</span> <span word="methane">methane</span>，<span word="the">the</span> <span word="scientists">scientists</span> <span word="created">created</span> <span word="B">B</span> <span word="an">an</span> <span word="environment">environment</span> <span word="with">with</span> <span word="the">the</span> <span word="same">same</span> <span word="concentration">concentration</span> <span word="of">of</span> <span word="oxygen">oxygen</span> <span word="as">as</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="has">has</span>． <span word="D">D</span> <span word="an">an</span> <span word="environment">environment</span> <span word="filled">filled</span> <span word="with">with</span> <span word="the">the</span> <span word="greenhouse">greenhouse</span> <span word="gas">gas</span>． <span word="A">A</span> <span word="The">The</span> <span word="lower">lower</span> <span word="the">the</span> <span word="temperature">temperature</span>，<span word="the">the</span> <span word="higher">higher</span> <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="methane">methane</span> <span word="emissions">emissions</span>． <span word="C">C</span> <span word="When">When</span> <span word="exposed">exposed</span> <span word="to">to</span> <span word="sunlight">sunlight</span>，<span word="plants">plants</span> <span word="stop">stop</span> <span word="releasing">releasing</span> <span word="methane">methane</span>． <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="about">about</span> <span word="methane">methane</span> <span word="is">is</span> <span word="Not">Not</span> <span word="mentioned">mentioned</span> <span word="in">in</span> <span word="the">the</span> <span word="passage">passage</span>? <span word="B">B</span> <span word="Plants">Plants</span> <span word="growing">growing</span> <span word="in">in</span> <span word="water">water</span> <span word="release">release</span> <span word="methane">methane</span>． <span word="D">D</span> <span word="Microbes">Microbes</span> <span word="in">in</span> <span word="plants">plants</span> <span word="produce">produce</span> <span word="methane">methane</span>． <span word="A">A</span> <span word="Methane">Methane</span> <span word="becomes">becomes</span> <span word="less">less</span> <span word="poisonous">poisonous</span>． <span word="C">C</span> <span word="Less">Less</span> <span word="methane">methane</span> <span word="reaches">reaches</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span>． 答案与题解： <span word="C">C</span> 短文的第一和第二段都讲到，科学家过去曾经认为，沼气必须在无氧的环境中才能产生。注意，作者用的是过去式：<span word="Most">Most</span> <span word="scientists">scientists</span> <span word="assumed">assumed</span> <span word="that">that</span>．．．<span word="They">They</span> <span word="had">had</span> <span word="assumed">assumed</span> <span word="that">that</span>．．．。 <span word="D">D</span> 根据第四和第五段的内容，只有<span word="D">D</span>是正确的说法。温度越高沼气的释放量越高，有生命的植物释放的沼气远大于干植物的释放量，在阳光下，它们的沼气释放量是正常情况的三倍。 <span word="C">C</span> 最后一段的第二句可以找到本题的答案。</p>
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