2013职称英语理工类的B级阅读理解通关习题7
<p> 阅读理解：</p><p> <span word="Putting">Putting</span> <span word="Plants">Plants</span> <span word="to">to</span> <span word="Work">Work</span></p><p> <span word="Cells">Cells</span> <span word="in">in</span> <span word="the">the</span> <span word="green">green</span> <span word="leaves">leaves</span> <span word="of">of</span> <span word="plants">plants</span> <span word="work">work</span> <span word="like">like</span> <span word="tiny">tiny</span> <span word="factories">factories</span> <span word="to">to</span> <span word="convert">convert</span> <span word="sunlight">sunlight</span>, <span word="carbon">carbon</span> <span word="dioxide">dioxide</span>, <span word="and">and</span> <span word="water">water</span> <span word="into">into</span> <span word="sugars">sugars</span> <span word="and">and</span> <span word="starches">starches</span>, <span word="stored">stored</span> <span word="energy">energy</span> <span word="that">that</span> <span word="the">the</span> <span word="plants">plants</span> <span word="can">can</span> <span word="use">use</span>. <span word="This">This</span> <span word="conversion">conversion</span> <span word="process">process</span> <span word="is">is</span> <span word="called">called</span> <span word="photosynthesis">photosynthesis</span>. <span word="Unfortunately">Unfortunately</span>, <span word="unless">unless</span> <span word="youre">youre</span> <span word="a">a</span> <span word="plant">plant</span>, <span word="its">its</span> <span word="difficult">difficult</span> <span word="and">and</span> <span word="expensive">expensive</span> <span word="to">to</span> <span word="convert">convert</span> <span word="sunlight">sunlight</span> <span word="into">into</span> <span word="storable">storable</span> <span word="energy">energy</span>. <span word="Thats">Thats</span> <span word="why">why</span> <span word="scientists">scientists</span> <span word="are">are</span> <span word="taking">taking</span> <span word="a">a</span> <span word="closer">closer</span> <span word="look">look</span> <span word="at">at</span> <span word="exactly">exactly</span> <span word="how">how</span> <span word="plants">plants</span> <span word="do">do</span> <span word="it">it</span>.</p><p> <span word="The">The</span> <span word="algae">algae</span> <span word="are">are</span> <span word="grown">grown</span> <span word="in">in</span> <span word="narrow">narrow</span>-<span word="necked">necked</span> <span word="glass">glass</span> <span word="bottles">bottles</span> <span word="to">to</span> <span word="produce">produce</span> <span word="hydrogen">hydrogen</span> <span word="in">in</span> <span word="the">the</span> <span word="lab">lab</span>. <span word="During">During</span> <span word="photosynthesis">photosynthesis</span>, <span word="plants">plants</span> <span word="normally">normally</span> <span word="make">make</span> <span word="sugars">sugars</span> <span word="or">or</span> <span word="starches">starches</span>. <span word="But">But</span> <span word="under">under</span> <span word="certain">certain</span> <span word="conditions">conditions</span>, <span word="a">a</span> <span word="lot">lot</span> <span word="of">of</span> <span word="algae">algae</span> <span word="are">are</span> <span word="able">able</span> <span word="to">to</span> <span word="use">use</span> <span word="the">the</span> <span word="sunlight">sunlight</span> <span word="energy">energy</span> <span word="not">not</span> <span word="to">to</span> <span word="store">store</span> <span word="starch">starch</span>, <span word="but">but</span> <span word="to">to</span> <span word="make">make</span> <span word="hydrogen">hydrogen</span>. <span word="Ghirardi">Ghirardi</span> <span word="says">says</span>. <span word="For">For</span> <span word="example">example</span>, <span word="algae">algae</span> <span word="will">will</span> <span word="produce">produce</span> <span word="hydrogen">hydrogen</span> <span word="in">in</span> <span word="an">an</span> <span word="airfree">airfree</span> <span word="environment">environment</span>. <span word="Its">Its</span> <span word="the">the</span> <span word="oxygen">oxygen</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span> <span word="that">that</span> <span word="prevents">prevents</span> <span word="algae">algae</span> <span word="from">from</span> <span word="making">making</span> <span word="hydrogen">hydrogen</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="time">time</span>.</p><p> <span word="Unfortunately">Unfortunately</span>, <span word="removing">removing</span> <span word="the">the</span> <span word="sulfate">sulfate</span> <span word="also">also</span> <span word="makes">makes</span> <span word="the">the</span> <span word="algaes">algaes</span> <span word="cells">cells</span> <span word="work">work</span> <span word="very">very</span> <span word="slowly">slowly</span>, <span word="and">and</span> <span word="not">not</span> <span word="much">much</span> <span word="hydrogen">hydrogen</span> <span word="is">is</span> <span word="produced">produced</span>. <span word="Still">Still</span>, <span word="the">the</span> <span word="researchers">researchers</span> <span word="see">see</span> <span word="this">this</span> <span word="as">as</span> <span word="a">a</span> <span word="first">first</span> <span word="step">step</span> <span word="in">in</span> <span word="their">their</span> <span word="goal">goal</span> <span word="to">to</span> <span word="produce">produce</span> <span word="hydrogen">hydrogen</span> <span word="efficiently">efficiently</span> <span word="from">from</span> <span word="algae">algae</span>. <span word="With">With</span> <span word="more">more</span> <span word="work">work</span>, <span word="they">they</span> <span word="may">may</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="speed">speed</span> <span word="the">the</span> <span word="cells">cells</span> <span word="activity">activity</span> <span word="and">and</span> <span word="produce">produce</span> <span word="larger">larger</span> <span word="quantities">quantities</span> <span word="of">of</span> <span word="hydrogen">hydrogen</span>.</p><p> 36. <span word="What">What</span> <span word="does">does</span> <span word="the">the</span> <span word="writer">writer</span> <span word="say">say</span> <span word="about">about</span> <span word="plants">plants</span> <span word="concerning">concerning</span> <span word="solar">solar</span> <span word="energy">energy</span>?</p><p> <span word="B">B</span> <span word="Plants">Plants</span> <span word="have">have</span> <span word="been">been</span> <span word="used">used</span> <span word="to">to</span> <span word="produce">produce</span> <span word="solar">solar</span> <span word="energy">energy</span>.</p><p> <span word="D">D</span> <span word="Plants">Plants</span> <span word="have">have</span> <span word="been">been</span> <span word="a">a</span> <span word="source">source</span> <span word="of">of</span> <span word="solar">solar</span> <span word="energy">energy</span>.</p>
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