大学英语六级阅读理解历年真题训练unit21
<p> <span word="Unit">Unit</span> 21</p><p> <span word="Part">Part</span> <span word="II">II</span> <span word="Reading">Reading</span> <span word="Comprehension">Comprehension</span></p><p> <span word="Directions">Directions</span>: <span word="There">There</span> <span word="are">are</span> 4 <span word="passages">passages</span> <span word="in">in</span> <span word="this">this</span> <span word="part">part</span>. <span word="Each">Each</span> <span word="passage">passage</span> <span word="is">is</span> <span word="followed">followed</span> <span word="by">by</span> <span word="some">some</span> <span word="questions">questions</span> <span word="or">or</span> <span word="unfinished">unfinished</span> <span word="statements">statements</span>. <span word="For">For</span> <span word="each">each</span> <span word="of">of</span> <span word="them">them</span> <span word="there">there</span> <span word="are">are</span> <span word="four">four</span> <span word="choices">choices</span> <span word="marked">marked</span> <span word="A">A</span>), <span word="B">B</span>), <span word="C">C</span>) <span word="and">and</span> <span word="D">D</span>). <span word="You">You</span> <span word="should">should</span> <span word="decide">decide</span> <span word="on">on</span> <span word="the">the</span> <span word="best">best</span> <span word="choice">choice</span> <span word="and">and</span> <span word="mark">mark</span> <span word="the">the</span> <span word="corresponding">corresponding</span> <span word="letter">letter</span> <span word="on">on</span> <span word="the">the</span> <span word="Answer">Answer</span> <span word="Sheet">Sheet</span> <span word="with">with</span> <span word="a">a</span> <span word="single">single</span> <span word="line">line</span> <span word="through">through</span> <span word="the">the</span> <span word="centre">centre</span>.</p><p> <span word="Passage">Passage</span> <span word="One">One</span></p><p> <span word="Questions">Questions</span> 21 <span word="to">to</span> 25 <span word="are">are</span> <span word="based">based</span> <span word="on">on</span> <span word="the">the</span> <span word="following">following</span> <span word="passage">passage</span>.</p><p> <span word="When">When</span> <span word="global">global</span> <span word="warming">warming</span> <span word="finally">finally</span> <span word="came">came</span>, <span word="it">it</span> <span word="stuck">stuck</span> <span word="with">with</span> <span word="a">a</span> <span word="vengeance">vengeance</span>. <span word="In">In</span> <span word="some">some</span> <span word="regions">regions</span>, <span word="temperatures">temperatures</span> <span word="rose">rose</span> <span word="several">several</span> <span word="degrees">degrees</span> <span word="in">in</span> <span word="less">less</span> <span word="than">than</span> <span word="a">a</span> <span word="century">century</span>. <span word="Sea">Sea</span> <span word="levels">levels</span> <span word="shot">shot</span> <span word="up">up</span> <span word="nearly">nearly</span> 400 <span word="feet">feet</span>, <span word="flooding">flooding</span> <span word="coastal">coastal</span> <span word="settlements">settlements</span> <span word="and">and</span> <span word="forcing">forcing</span> <span word="people">people</span> <span word="to">to</span> <span word="migrate">migrate</span> <span word="inland">inland</span>. <span word="Deserts">Deserts</span> <span word="spread">spread</span> <span word="throughout">throughout</span> <span word="the">the</span> <span word="world">world</span> <span word="as">as</span> <span word="vegetation">vegetation</span> <span word="shifted">shifted</span> <span word="drastically">drastically</span> <span word="in">in</span> <span word="North">North</span> <span word="America">America</span>, <span word="Europe">Europe</span> <span word="and">and</span> <span word="Asia">Asia</span>. <span word="After">After</span> <span word="driving">driving</span> <span word="many">many</span> <span word="of">of</span> <span word="the">the</span> <span word="animals">animals</span> <span word="around">around</span> <span word="them">them</span> <span word="to">to</span> <span word="near">near</span> <span word="extinction">extinction</span>, <span word="people">people</span> <span word="were">were</span> <span word="forced">forced</span> <span word="to">to</span> <span word="abandon">abandon</span> <span word="their">their</span> <span word="old">old</span> <span word="way">way</span> <span word="of">of</span> <span word="life">life</span> <span word="for">for</span> <span word="a">a</span> <span word="radically">radically</span> <span word="new">new</span> <span word="survival">survival</span> <span word="strategy">strategy</span> <span word="that">that</span> <span word="resulted">resulted</span> <span word="in">in</span> <span word="widespread">widespread</span> <span word="starvation">starvation</span> <span word="and">and</span> <span word="disease">disease</span>. <span word="The">The</span> <span word="adaptation">adaptation</span> <span word="was">was</span> <span word="farming">farming</span>: <span word="the">the</span> <span word="global">global</span>-<span word="warming">warming</span> <span word="crisis">crisis</span> <span word="that">that</span> <span word="gave">gave</span> <span word="rise">rise</span> <span word="to">to</span> <span word="it">it</span> <span word="happened">happened</span> <span word="more">more</span> <span word="than">than</span> 10,000 <span word="years">years</span> <span word="ago">ago</span>.</p><p> <span word="As">As</span> <span word="environmentalists">environmentalists</span> <span word="convene">convene</span> <span word="in">in</span> <span word="Rio">Rio</span> <span word="de">de</span> <span word="Janeiro">Janeiro</span> <span word="this">this</span> <span word="week">week</span> <span word="to">to</span> <span word="ponder">ponder</span> <span word="the">the</span> <span word="global">global</span> <span word="climate">climate</span> <span word="of">of</span> <span word="the">the</span> <span word="future">future</span>, <span word="earth">earth</span> <span word="scientists">scientists</span> <span word="are">are</span> <span word="in">in</span> <span word="the">the</span> <span word="midst">midst</span> <span word="of">of</span> <span word="a">a</span> <span word="revolution">revolution</span> <span word="in">in</span> <span word="understanding">understanding</span> <span word="how">how</span> <span word="climate">climate</span> <span word="has">has</span> <span word="changed">changed</span> <span word="in">in</span> <span word="the">the</span> <span word="pastand">pastand</span> <span word="how">how</span> <span word="those">those</span> <span word="changes">changes</span> <span word="have">have</span> <span word="transformed">transformed</span> <span word="human">human</span> <span word="existence">existence</span>. <span word="Researchers">Researchers</span> <span word="have">have</span> <span word="begun">begun</span> <span word="to">to</span> <span word="piece">piece</span> <span word="together">together</span> <span word="an">an</span> <span word="illuminating">illuminating</span> <span word="picture">picture</span> <span word="of">of</span> <span word="the">the</span> <span word="powerful">powerful</span> <span word="geological">geological</span> <span word="and">and</span> <span word="astronomical">astronomical</span> <span word="forces">forces</span> <span word="that">that</span> <span word="have">have</span> <span word="combined">combined</span> <span word="to">to</span> <span word="change">change</span> <span word="the">the</span> <span word="planets">planets</span> <span word="environment">environment</span> <span word="from">from</span> <span word="hot">hot</span> <span word="to">to</span> <span word="cold">cold</span>, <span word="wet">wet</span> <span word="to">to</span> <span word="dry">dry</span> <span word="and">and</span> <span word="back">back</span> <span word="again">again</span> <span word="over">over</span> <span word="a">a</span> <span word="time">time</span> <span word="period">period</span> <span word="stretching">stretching</span> <span word="back">back</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="millions">millions</span> <span word="of">of</span> <span word="year">year</span>.</p>
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