2015年职称英语考试理工类阅读理解测试题(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>?</p><p> <span word="Scientists">Scientists</span> <span word="are">are</span> <span word="seriously">seriously</span> <span word="concerned">concerned</span> <span word="about">about</span> <span word="this">this</span> <span word="question">question</span>. <span word="First">First</span> <span word="of">of</span> <span word="all">all</span>, <span word="amphibians">amphibians</span> <span word="are">are</span> <span word="an">an</span> <span word="important">important</span> <span word="source">source</span> <span word="of">of</span> <span word="scientific">scientific</span> <span word="and">and</span> <span word="medical">medical</span> <span word="knowledge">knowledge</span>. <span word="By">By</span> <span word="studying">studying</span> <span word="amphibians">amphibians</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="learned">learned</span> <span word="about">about</span> <span word="new">new</span> <span word="substances">substances</span> <span word="that">that</span> <span word="could">could</span> <span word="be">be</span> <span word="very">very</span> <span word="useful">useful</span> <span word="for">for</span> <span word="treating">treating</span> <span word="human">human</span> <span word="diseases">diseases</span>. <span word="Further">Further</span> <span word="research">research</span> <span word="could">could</span> <span word="lead">lead</span> <span word="to">to</span> <span word="many">many</span> <span word="more">more</span> <span word="discoveries">discoveries</span>, <span word="but">but</span> <span word="that">that</span> <span word="will">will</span> <span word="be">be</span> <span word="impossible">impossible</span> <span word="if">if</span> <span word="the">the</span> <span word="amphibians">amphibians</span> <span word="disappear">disappear</span>.</p><p> <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>?</p><p> <span word="Scientists">Scientists</span> <span word="now">now</span> <span word="believe">believe</span> <span word="that">that</span> <span word="amphibian">amphibian</span> <span word="decline">decline</span> <span word="is">is</span> <span word="due">due</span> <span word="to">to</span> <span word="several">several</span> <span word="environmental">environmental</span> <span word="factors">factors</span>. <span word="One">One</span> <span word="of">of</span> <span word="these">these</span> <span word="factors">factors</span> <span word="is">is</span> <span word="the">the</span> <span word="destruction">destruction</span> <span word="of">of</span> <span word="habitat">habitat</span>, <span word="the">the</span> <span word="natural">natural</span> <span word="area">area</span> <span word="where">where</span> <span word="an">an</span> <span word="animal">animal</span> <span word="lives">lives</span>. <span word="Amphibians">Amphibians</span> <span word="are">are</span> <span word="very">very</span> <span word="sensitive">sensitive</span> <span word="to">to</span> <span word="changes">changes</span> <span word="in">in</span> <span word="their">their</span> <span word="habitat">habitat</span>. <span word="If">If</span> <span word="they">they</span> <span word="cannot">cannot</span> <span word="find">find</span> <span word="the">the</span> <span word="right">right</span> <span word="conditions">conditions</span>, <span word="they">they</span> <span word="will">will</span> <span word="not">not</span> <span word="lay">lay</span> <span word="their">their</span> <span word="eggs">eggs</span>. <span word="These">These</span> <span word="days">days</span>, <span word="as">as</span> <span word="wild">wild</span> <span word="areas">areas</span> <span word="are">are</span> <span word="covered">covered</span> <span word="with">with</span> <span word="houses">houses</span>, <span word="roads">roads</span>, <span word="farms">farms</span>, <span word="or">or</span> <span word="factories">factories</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="no">no</span> <span word="longer">longer</span> <span word="laying">laying</span> <span word="eggs">eggs</span>. <span word="For">For</span> <span word="example">example</span>, <span word="the">the</span> <span word="arroyo">arroyo</span> <span word="toad">toad</span> <span word="of">of</span> <span word="southern">southern</span> <span word="California">California</span> <span word="will">will</span> <span word="only">only</span> <span word="lay">lay</span> <span word="its">its</span> <span word="eggs">eggs</span> <span word="on">on</span> <span word="the">the</span> <span word="sandy">sandy</span> <span word="bottom">bottom</span> <span word="of">of</span> <span word="a">a</span> <span word="slow">slow</span>-<span word="moving">moving</span> <span word="stream">stream</span>. <span word="There">There</span> <span word="are">are</span> <span word="very">very</span> <span word="few">few</span> <span word="streams">streams</span> <span word="left">left</span> <span word="in">in</span> <span word="southern">southern</span> <span word="California">California</span>, <span word="and">and</span> <span word="those">those</span> <span word="streams">streams</span> <span word="are">are</span> <span word="often">often</span> <span word="muddy">muddy</span> <span word="because">because</span> <span word="of">of</span> <span word="building">building</span> <span word="projects">projects</span>. <span word="Not">Not</span> <span word="surprisingly">surprisingly</span>, <span word="the">the</span> <span word="arroyo">arroyo</span> <span word="toad">toad</span> <span word="is">is</span> <span word="now">now</span> <span word="in">in</span> <span word="danger">danger</span> <span word="of">of</span> <span word="extinction">extinction</span>.</p>
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