职称英语考试理工类阅读理解专项训练(3)
<p> <span word="Plant">Plant</span> <span word="Gas">Gas</span> <span word="Scientists">Scientists</span> <span word="have">have</span> <span word="been">been</span> <span word="studying">studying</span> <span word="natural">natural</span> <span word="sources">sources</span> <span word="of">of</span> <span word="methane">methane</span> <span word="for">for</span> <span word="decades">decades</span> <span word="but">but</span> <span word="hadnt">hadnt</span> <span word="regarded">regarded</span> <span word="plants">plants</span> <span word="as">as</span> <span word="a">a</span> <span word="producer">producer</span>，<span word="notes">notes</span> <span word="Frank">Frank</span> <span word="Keppler">Keppler</span>，<span word="a">a</span> <span word="geochem">geochem</span>[<span word="st">st</span> <span word="at">at</span> <span word="the">the</span> <span word="Max">Max</span> <span word="Planck">Planck</span> <span word="Institute">Institute</span> <span word="for">for</span> <span word="Nuclear">Nuclear</span> <span word="Physics">Physics</span> <span word="in">in</span> <span word="Heidelberg">Heidelberg</span>，<span word="Germany">Germany</span>1.<span word="Now">Now</span> <span word="Keppler">Keppler</span> <span word="and">and</span> <span word="his">his</span> <span word="colleagues">colleagues</span> <span word="find">find</span> <span word="that">that</span> <span word="plants">plants</span>，<span word="from">from</span> <span word="grasses">grasses</span> <span word="to">to</span> <span word="trees">trees</span>，<span word="may">may</span> <span word="also">also</span> <span word="be">be</span> <span word="sources">sources</span> <span word="of">of</span> <span word="the">the</span> <span word="greenhouse">greenhouse</span> <span word="gas">gas</span>.<span word="This">This</span> <span word="is">is</span> <span word="really">really</span> <span word="surprising">surprising</span>，<span word="because">because</span> <span word="most">most</span> <span word="scientists">scientists</span> <span word="assumed">assumed</span> <span word="that">that</span> <span word="methane">methane</span> <span word="production">production</span> <span word="requires">requires</span> <span word="an">an</span> <span word="oxygen">oxygen</span>-<span word="free">free</span> <span word="environment">environment</span>. <span word="In">In</span> <span word="its">its</span> <span word="experiments">experiments</span>，<span word="Kepplers">Kepplers</span> <span word="team">team</span> <span word="used">used</span> <span word="sealed">sealed</span> <span word="chambers">chambers</span> <span word="that">that</span> <span word="contained">contained</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="that">that</span> <span word="Earths">Earths</span> <span word="atmosphere">atmosphere</span> <span word="has">has</span>.<span word="They">They</span> <span word="measured">measured</span> <span word="the">the</span> <span word="amounts">amounts</span> <span word="of">of</span> <span word="methane">methane</span> <span word="that">that</span> <span word="were">were</span> <span word="released">released</span> <span word="by">by</span> <span word="both">both</span> <span word="living">living</span> <span word="plants">plants</span>;<span word="and">and</span> <span word="dried">dried</span> <span word="plant">plant</span> <span word="material">material</span>，<span word="such">such</span> <span word="as">as</span> <span word="fallen">fallen</span> <span word="leaves">leaves</span>. <span word="Living">Living</span> <span word="plants">plants</span> <span word="growing">growing</span> <span word="at">at</span> <span word="their">their</span> <span word="normal">normal</span> <span word="temperatures">temperatures</span> <span word="released">released</span> <span word="as">as</span> <span word="much">much</span> <span word="as">as</span> 370 <span word="nanograms">nanograms</span> <span word="of">of</span> <span word="methane">methane</span> <span word="per">per</span> <span word="gram">gram</span> <span word="of">of</span> <span word="plant">plant</span> <span word="tissue">tissue</span> <span word="per">per</span> <span word="hour">hour</span>.<span word="Methane">Methane</span> <span word="emissions">emissions</span> <span word="tripled">tripled</span> <span word="when">when</span> <span word="living">living</span> <span word="and">and</span> <span word="dead">dead</span> <span word="plant">plant</span> <span word="was">was</span> <span word="exposed">exposed</span> <span word="to">to</span> <span word="sunlight">sunlight</span>. <span word="The">The</span> <span word="new">new</span> <span word="finding">finding</span> <span word="is">is</span> <span word="an">an</span> <span word="interesting">interesting</span> <span word="observation">observation</span>, <span word="says">says</span> <span word="Jennifer">Jennifer</span> <span word="Y">Y</span>.<span word="King">King</span>，<span word="a">a</span> <span word="biogeochemist">biogeochemist</span> <span word="at">at</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Minnesota">Minnesota</span> <span word="in">in</span> <span word="St">St</span>.<span word="Paul">Paul</span>3.<span word="Because">Because</span> <span word="some">some</span> <span word="types">types</span> <span word="of">of</span> <span word="soil">soil</span> <span word="microbes">microbes</span> <span word="consume">consume</span> <span word="methane">methane</span>，<span word="they">they</span> <span word="may">may</span> <span word="prevent">prevent</span> <span word="plant">plant</span>-<span word="produced">produced</span> <span word="methane">methane</span> <span word="from">from</span> <span word="reaching">reaching</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span>.<span word="Field">Field</span> <span word="tests">tests</span> <span word="will">will</span> <span word="be">be</span> <span word="needed">needed</span> <span word="to">to</span> <span word="assess">assess</span> <span word="the">the</span> <span word="plants">plants</span> <span word="influence">influence</span>，<span word="she">she</span> <span word="notes">notes</span>. <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>. 2. <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>. 4. <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>. </p>
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