2015考研英语阅读大灭绝
<p> <span word="Mass">Mass</span> <span word="extinctions">extinctions</span></p><p> 大灭绝</p><p> <span word="Small">Small</span> <span word="but">but</span> <span word="deadly">deadly</span></p><p> 陨石很小不过危害却很致命</p><p> <span word="The">The</span> <span word="biggest">biggest</span> <span word="extinction">extinction</span> <span word="in">in</span> <span word="history">history</span> <span word="was">was</span> <span word="probablycaused">probablycaused</span> <span word="by">by</span> <span word="a">a</span> <span word="space">space</span> <span word="rock">rock</span> <span word="that">that</span> <span word="changed">changed</span> <span word="the">the</span> <span word="climate">climate</span></p><p> 历史上规模最大的一次物种灭绝，也许是由于陨石坠落导致的气候变化而造成</p><p> <span word="AS">AS</span> <span word="EVERY">EVERY</span> <span word="schoolchild">schoolchild</span> <span word="knows">knows</span>, <span word="the">the</span> <span word="dinosaurs">dinosaurs</span> <span word="were">were</span> <span word="wiped">wiped</span> <span word="out">out</span> <span word="in">in</span> <span word="an">an</span> <span word="instant">instant</span>, <span word="when">when</span> <span word="a">a</span> <span word="rock">rock</span> <span word="fromouter">fromouter</span> <span word="space">space</span> <span word="hit">hit</span> <span word="what">what</span> <span word="is">is</span> <span word="now">now</span> <span word="southern">southern</span> <span word="Mexico">Mexico</span>.</p><p> 就像每个小学生知道的那样，当一块天外陨石坠落到现今的墨西哥南部地区之后，恐龙就那在一瞬间遭受了灭顶之灾。</p><p> <span word="That">That</span> <span word="happened">happened</span> 66<span word="m">m</span> <span word="years">years</span> <span word="ago">ago</span>, <span word="at">at</span> <span word="the">the</span> <span word="end">end</span> <span word="of">of</span> <span word="the">the</span> <span word="Cretaceous">Cretaceous</span> <span word="period">period</span>.</p><p> 这一切就发生在6600万年前的白垩纪末期。</p><p> <span word="Well">Well</span>-<span word="informed">informed</span> <span word="schoolchildren">schoolchildren</span> <span word="also">also</span> <span word="know">know</span> <span word="that">that</span> <span word="this">this</span> <span word="mass">mass</span> <span word="extinction">extinction</span> <span word="was">was</span> <span word="neither">neither</span> <span word="unique">unique</span> <span word="northe">northe</span> <span word="biggest">biggest</span>.</p><p> 一些博学的小学生还知道这次物种大灭绝既不是历史上唯一的一次，也不是历史上最大的一次。</p><p> <span word="The">The</span> <span word="geological">geological</span> <span word="record">record</span> <span word="speaks">speaks</span> <span word="of">of</span> <span word="four">four</span> <span word="others">others</span> <span word="since">since</span> <span word="animal">animal</span> <span word="life">life</span> <span word="became">became</span> <span word="complex">complex</span> <span word="at">at</span> <span word="thebeginning">thebeginning</span> <span word="of">of</span> <span word="the">the</span> <span word="Cambrian">Cambrian</span> <span word="period">period</span> 541<span word="m">m</span> <span word="years">years</span> <span word="ago">ago</span>.</p><p> 地质学档案记录了5亿4100万年前寒武纪物种多样化以来的另外四次物种大灭绝。</p><p> <span word="What">What</span> <span word="neither">neither</span> <span word="these">these</span> <span word="clever">clever</span> <span word="schoolchildren">schoolchildren</span> <span word="nor">nor</span> <span word="anyone">anyone</span> <span word="else">else</span> <span word="knows">knows</span>, <span word="however">however</span>, <span word="is">is</span> <span word="whether">whether</span> <span word="theseextinctions">theseextinctions</span> <span word="had">had</span> <span word="similar">similar</span> <span word="causes">causes</span>.</p>
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