职称英语考试理工类阅读理解的练习题(3)
<p> <span word="In">In</span> <span word="the">the</span> 1980<span word="s">s</span>, <span word="scientists">scientists</span> <span word="around">around</span> <span word="the">the</span> <span word="world">world</span> <span word="began">began</span> <span word="to">to</span> <span word="notice">notice</span> <span word="something">something</span> <span word="strange">strange</span>: <span word="Frogs">Frogs</span> <span word="were">were</span> <span word="disappearing">disappearing</span>. <span word="More">More</span> <span word="recent">recent</span> <span word="research">research</span> <span word="has">has</span> <span word="shown">shown</span> <span word="that">that</span> <span word="many">many</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="amphibians">amphibians</span> <span word="are">are</span> <span word="declining">declining</span> <span word="or">or</span> <span word="have">have</span> <span word="become">become</span> <span word="extinct">extinct</span>. <span word="They">They</span> <span word="have">have</span> <span word="been">been</span> <span word="around">around</span> <span word="for">for</span> <span word="a">a</span> <span word="long">long</span> <span word="time">time</span> - <span word="over">over</span> 350 <span word="million">million</span> <span word="years">years</span>. <span word="Why">Why</span> <span word="are">are</span> <span word="they">they</span> <span word="dying">dying</span> <span word="out">out</span> <span word="now">now</span>? <span word="The">The</span> <span word="most">most</span> <span word="serious">serious</span> <span word="aspect">aspect</span> <span word="of">of</span> <span word="amphibian">amphibian</span> <span word="loss">loss</span>, <span word="however">however</span>, <span word="goes">goes</span> <span word="beyond">beyond</span> <span word="the">the</span> <span word="amphibians">amphibians</span> <span word="themselves">themselves</span>. <span word="Scientists">Scientists</span> <span word="are">are</span> <span word="beginning">beginning</span> <span word="to">to</span> <span word="think">think</span> <span word="about">about</span> <span word="what">what</span> <span word="amphibian">amphibian</span> <span word="decline">decline</span> <span word="means">means</span> <span word="for">for</span> <span word="the">the</span> <span word="planet">planet</span> <span word="as">as</span> <span word="a">a</span> <span word="whole">whole</span>. <span word="If">If</span> <span word="the">the</span> <span word="earth">earth</span> <span word="is">is</span> <span word="becoming">becoming</span> <span word="unlivable">unlivable</span> <span word="for">for</span> <span word="amphibians">amphibians</span>, <span word="is">is</span> <span word="it">it</span> <span word="also">also</span> <span word="becoming">becoming</span> <span word="unlivable">unlivable</span> <span word="for">for</span> <span word="other">other</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="animals">animals</span> <span word="and">and</span> <span word="human">human</span> <span word="beings">beings</span> <span word="as">as</span> <span word="well">well</span>? <span word="There">There</span> <span word="are">are</span> <span word="a">a</span> <span word="number">number</span> <span word="of">of</span> <span word="other">other</span> <span word="factors">factors</span> <span word="in">in</span> <span word="amphibian">amphibian</span> <span word="decline">decline</span>. <span word="Pollution">Pollution</span> <span word="is">is</span> <span word="one">one</span> <span word="of">of</span> <span word="them">them</span>. <span word="In">In</span> <span word="many">many</span> <span word="industrial">industrial</span> <span word="areas">areas</span>, <span word="air">air</span> <span word="pollution">pollution</span> <span word="has">has</span> <span word="poisoned">poisoned</span> <span word="the">the</span> <span word="rain">rain</span>, <span word="which">which</span> <span word="then">then</span> <span word="falls">falls</span> <span word="on">on</span> <span word="ponds">ponds</span> <span word="and">and</span> <span word="kills">kills</span> <span word="the">the</span> <span word="frogs">frogs</span> <span word="and">and</span> <span word="toads">toads</span> <span word="that">that</span> <span word="live">live</span> <span word="there">there</span>. <span word="In">In</span> <span word="farming">farming</span> <span word="areas">areas</span>, <span word="the">the</span> <span word="heavy">heavy</span> <span word="use">use</span> <span word="of">of</span> <span word="chemicals">chemicals</span> <span word="on">on</span> <span word="crops">crops</span> <span word="has">has</span> <span word="also">also</span> <span word="killed">killed</span> <span word="off">off</span> <span word="amphibians">amphibians</span>. <span word="Another">Another</span> <span word="factor">factor</span> <span word="is">is</span> <span word="that">that</span> <span word="air">air</span> <span word="pollution">pollution</span> <span word="has">has</span> <span word="led">led</span> <span word="to">to</span> <span word="increased">increased</span> <span word="levels">levels</span> <span word="of">of</span> <span word="ultraviolet">ultraviolet</span> <span word="light">light</span>. <span word="This">This</span> <span word="endangers">endangers</span> <span word="amphibians">amphibians</span>, <span word="which">which</span> <span word="seem">seem</span> <span word="to">to</span> <span word="be">be</span> <span word="especially">especially</span> <span word="sensitive">sensitive</span> <span word="to">to</span> <span word="UV">UV</span> <span word="light">light</span>. <span word="And">And</span> <span word="finally">finally</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="discovered">discovered</span> <span word="a">a</span> <span word="new">new</span> <span word="disease">disease</span> <span word="that">that</span> <span word="seems">seems</span> <span word="to">to</span> <span word="be">be</span> <span word="killing">killing</span> <span word="many">many</span> <span word="species">species</span> <span word="of">of</span> <span word="amphibians">amphibians</span> <span word="in">in</span> <span word="different">different</span> <span word="parts">parts</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span>. 36 <span word="Losing">Losing</span> <span word="amphibians">amphibians</span> <span word="means">means</span> <span word="losing">losing</span> <span word="B">B</span> <span word="knowledge">knowledge</span> <span word="about">about</span> <span word="air">air</span> <span word="and">and</span> <span word="water">water</span> <span word="pollution">pollution</span>. <span word="D">D</span> <span word="an">an</span> <span word="opportunity">opportunity</span> <span word="to">to</span> <span word="detect">detect</span> <span word="poisonous">poisonous</span> <span word="gases">gases</span>. <span word="A">A</span> <span word="in">in</span> <span word="any">any</span> <span word="stream">stream</span> <span word="they">they</span> <span word="can">can</span> <span word="find">find</span>, <span word="C">C</span> <span word="only">only</span> <span word="on">on</span> <span word="sand">sand</span>. 38 <span word="The">The</span> <span word="arroyo">arroyo</span> <span word="toad">toad</span> <span word="is">is</span> <span word="disappearing">disappearing</span> <span word="because">because</span> <span word="B">B</span> <span word="it">it</span> <span word="is">is</span> <span word="losing">losing</span> <span word="its">its</span> <span word="habitat">habitat</span>. <span word="D">D</span> <span word="it">it</span> <span word="cant">cant</span> <span word="bear">bear</span> <span word="the">the</span> <span word="cold">cold</span> <span word="of">of</span> <span word="winter">winter</span>. <span word="A">A</span> <span word="poisonous">poisonous</span> <span word="gases">gases</span>. <span word="C">C</span> <span word="water">water</span> <span word="leakage">leakage</span>. 40 <span word="Scientists">Scientists</span> <span word="think">think</span> <span word="that">that</span> <span word="the">the</span> <span word="decline">decline</span> <span word="of">of</span> <span word="amphibians">amphibians</span> <span word="could">could</span> <span word="B">B</span> <span word="cause">cause</span> <span word="a">a</span> <span word="decline">decline</span> <span word="in">in</span> <span word="other">other</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="animals">animals</span>. <span word="D">D</span> <span word="be">be</span> <span word="a">a</span> <span word="good">good</span> <span word="sign">sign</span> <span word="for">for</span> <span word="human">human</span> <span word="beings">beings</span>. </p>
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