2015职称英语理工类A级阅读理解练习及答案(3)
<p> <span word="The">The</span> <span word="Exploding">Exploding</span> <span word="Lakes">Lakes</span> <span word="of">of</span> <span word="Cameroon">Cameroon</span></p><p> <span word="Lake">Lake</span> <span word="Nyos">Nyos</span> <span word="and">and</span> <span word="Lake">Lake</span> <span word="Monoun">Monoun</span> <span word="are">are</span> <span word="craterlakes">craterlakes</span> <span word="They">They</span> <span word="were">were</span> <span word="formed">formed</span> <span word="when">when</span> <span word="water">water</span> <span word="collected">collected</span> <span word="in">in</span> <span word="the">the</span> <span word="craters">craters</span> <span word="of">of</span> <span word="old">old</span> <span word="volcanoes">volcanoes</span> <span word="The">The</span> <span word="volcanoes">volcanoes</span> <span word="under">under</span> <span word="Lake">Lake</span> <span word="Nyos">Nyos</span> <span word="and">and</span> <span word="Lake">Lake</span> <span word="Monoun">Monoun</span> <span word="are">are</span> <span word="not">not</span> <span word="active">active</span> <span word="anymore">anymore</span>. <span word="However">However</span>, <span word="poisonous">poisonous</span> <span word="gases">gases</span> <span word="from">from</span> <span word="the">the</span> <span word="center">center</span> <span word="of">of</span> <span word="the">the</span> <span word="earth">earth</span> <span word="continue">continue</span> <span word="to">to</span> <span word="flow">flow</span> <span word="up">up</span> <span word="through">through</span> <span word="cracks">cracks</span> <span word="in">in</span> <span word="the">the</span> <span word="bottom">bottom</span> <span word="of">of</span> <span word="the">the</span> <span word="lake">lake</span>. <span word="This">This</span> <span word="is">is</span> <span word="normal">normal</span> <span word="in">in</span> <span word="a">a</span> <span word="crater">crater</span> <span word="lake">lake</span>. <span word="In">In</span> <span word="most">most</span> <span word="crater">crater</span> <span word="lakes">lakes</span>，<span word="these">these</span> <span word="gases">gases</span> <span word="are">are</span> <span word="released">released</span> <span word="often">often</span> <span word="because">because</span> <span word="the">the</span> <span word="waterturns">waterturns</span> <span word="overregularly">overregularly</span>.<span word="That">That</span> <span word="is">is</span>，<span word="the">the</span> <span word="water">water</span> <span word="from">from</span> <span word="the">the</span> <span word="bottom">bottom</span> <span word="of">of</span> <span word="the">the</span> <span word="lake">lake</span> <span word="rises">rises</span> <span word="and">and</span> <span word="mixes">mixes</span> <span word="with">with</span> <span word="the">the</span> <span word="water">water</span> <span word="at">at</span> <span word="the">the</span> <span word="top">top</span>，<span word="allowing">allowing</span> <span word="the">the</span> <span word="gases">gases</span> <span word="to">to</span> <span word="escape">escape</span> <span word="slowly">slowly</span>.</p><p> <span word="In">In</span> <span word="the">the</span> <span word="past">past</span>，<span word="no">no</span> <span word="one">one</span> <span word="knew">knew</span> <span word="when">when</span> <span word="the">the</span> <span word="gases">gases</span> <span word="might">might</span> <span word="explode">explode</span>，<span word="so">so</span> <span word="there">there</span> <span word="was">was</span> <span word="no">no</span> <span word="way">way</span> <span word="for">for</span> <span word="the">the</span> <span word="villagers">villagers</span> <span word="to">to</span> <span word="escape">escape</span> <span word="disaster">disaster</span>. <span word="Now">Now</span> <span word="scientists">scientists</span> <span word="from">from</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>，<span word="France">France</span>，<span word="and">and</span> <span word="Cameroon">Cameroon</span> <span word="have">have</span> <span word="found">found</span> <span word="a">a</span> <span word="way">way</span> <span word="to">to</span> <span word="reduce">reduce</span> <span word="the">the</span> <span word="gas">gas</span> <span word="pressure">pressure</span> <span word="at">at</span> <span word="the">the</span> <span word="bottom">bottom</span> <span word="of">of</span> <span word="Lake">Lake</span> <span word="Nyos">Nyos</span>.<span word="They">They</span> <span word="stood">stood</span> <span word="a">a</span> 672-<span word="foot">foot</span> <span word="plastic">plastic</span> <span word="pipe">pipe</span> <span word="in">in</span> <span word="the">the</span> <span word="middle">middle</span> <span word="of">of</span> <span word="the">the</span> <span word="lake">lake</span>，<span word="with">with</span> <span word="one">one</span> <span word="end">end</span> <span word="of">of</span> <span word="the">the</span> <span word="pipe">pipe</span> <span word="near">near</span> <span word="the">the</span> <span word="bottom">bottom</span> <span word="and">and</span> <span word="the">the</span> <span word="other">other</span> <span word="end">end</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span>.<span word="Near">Near</span> <span word="the">the</span> <span word="top">top</span> <span word="of">of</span> <span word="the">the</span> <span word="pipe">pipe</span>，<span word="the">the</span> <span word="team">team</span> <span word="put">put</span> <span word="several">several</span> <span word="holes">holes</span> <span word="that">that</span> <span word="could">could</span> <span word="be">be</span> <span word="opened">opened</span> <span word="or">or</span> <span word="closed">closed</span> <span word="by">by</span> <span word="a">a</span> <span word="computer">computer</span>.<span word="Now">Now</span>，<span word="when">when</span> <span word="the">the</span> <span word="gas">gas</span> <span word="pressure">pressure</span> <span word="gets">gets</span> <span word="too">too</span> <span word="high">high</span>，<span word="the">the</span> <span word="holes">holes</span> <span word="are">are</span> <span word="opened">opened</span> <span word="and">and</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="gas">gas</span>-<span word="filled">filled</span> <span word="water">water</span> <span word="shoots">shoots</span> <span word="up">up</span> <span word="through">through</span> <span word="the">the</span> <span word="pipe">pipe</span> <span word="into">into</span> <span word="the">the</span> <span word="air">air</span> <span word="like">like</span> <span word="a">a</span> <span word="fountain">fountain</span>.<span word="With">With</span> <span word="less">less</span> <span word="pressure">pressure</span>，<span word="a">a</span> <span word="disastrous">disastrous</span> <span word="explosion">explosion</span> <span word="is">is</span> <span word="much">much</span> <span word="less">less</span> <span word="likely">likely</span>.<span word="However">However</span>, <span word="the">the</span> <span word="scientists">scientists</span> <span word="are">are</span> <span word="not">not</span> <span word="sure">sure</span> <span word="that">that</span> <span word="one">one</span> <span word="pipe">pipe</span> <span word="will">will</span> <span word="be">be</span> <span word="enough">enough</span> <span word="to">to</span> <span word="prevent">prevent</span> <span word="explosions">explosions</span>.<span word="They">They</span> <span word="hope">hope</span> <span word="to">to</span> <span word="put">put</span> <span word="in">in</span> <span word="others">others</span> <span word="soon">soon</span> <span word="and">and</span> <span word="they">they</span> <span word="plan">plan</span> <span word="to">to</span> <span word="install">install</span> <span word="a">a</span> <span word="similar">similar</span> <span word="pipe">pipe</span> <span word="and">and</span> <span word="a">a</span> <span word="computer">computer</span> <span word="system">system</span> <span word="at">at</span> <span word="Lake">Lake</span> <span word="Monoun">Monoun</span> <span word="as">as</span> <span word="well">well</span>.</p>
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