2015考研英语阅读寒武纪大爆发
<p> <span word="The">The</span> <span word="Cambrian">Cambrian</span> <span word="explosion">explosion</span></p><p> 寒武纪大爆发</p><p> <span word="Kingdom">Kingdom</span> <span word="come">come</span></p><p> 动物王国出现</p><p> <span word="Chinese">Chinese</span> <span word="palaeontologists">palaeontologists</span> <span word="hope">hope</span> <span word="to">to</span> <span word="explain">explain</span> <span word="the">the</span> <span word="riseof">riseof</span> <span word="the">the</span> <span word="animals">animals</span></p><p> 中国古生物学家希望解释动物的起源</p><p> <span word="AMONG">AMONG</span> <span word="the">the</span> <span word="mysteries">mysteries</span> <span word="of">of</span> <span word="evolution">evolution</span>, <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="most">most</span> <span word="profound">profound</span> <span word="is">is</span> <span word="what">what</span> <span word="exactly">exactly</span> <span word="happened">happened</span> <span word="atthe">atthe</span> <span word="beginning">beginning</span> <span word="of">of</span> <span word="the">the</span> <span word="Cambrian">Cambrian</span> <span word="period">period</span>.</p><p> 在众多进化之谜中，其中意义最深远的就是在寒武纪开始时期到底发生了什么。</p><p> <span word="Before">Before</span> <span word="that">that</span> <span word="period">period</span>, <span word="which">which</span> <span word="started">started</span> 541<span word="m">m</span> <span word="years">years</span> <span word="ago">ago</span> <span word="and">and</span> <span word="ran">ran</span> <span word="on">on</span> <span word="for">for</span> 56<span word="m">m</span> <span word="years">years</span>, <span word="life">life</span> <span word="was">was</span> <span word="amodest">amodest</span> <span word="thing">thing</span>.</p><p> 在寒武纪之前，从5.41亿年前开始持续5600万年的时代里，生命是适度存在的。</p><p> <span word="Bacteria">Bacteria</span> <span word="had">had</span> <span word="been">been</span> <span word="around">around</span> <span word="for">for</span> <span word="about">about</span> 3 <span word="billion">billion</span> <span word="years">years</span>, <span word="but">but</span> <span word="for">for</span> <span word="most">most</span> <span word="of">of</span> <span word="this">this</span> <span word="time">time</span> <span word="they">they</span> <span word="had">had</span> <span word="had">had</span> <span word="theEarth">theEarth</span> <span word="to">to</span> <span word="themselves">themselves</span>.</p><p> 细菌已经存在了大约30亿年，但是在多数时间里，它们主宰着地球。</p><p> <span word="Seaweeds">Seaweeds</span>, <span word="jellyfish">jellyfish</span>-<span word="like">like</span> <span word="creatures">creatures</span>,<span word="sponges">sponges</span> <span word="and">and</span> <span word="the">the</span> <span word="odd">odd</span> <span word="worm">worm</span> <span word="do">do</span> <span word="start">start</span> <span word="to">to</span> <span word="put">put</span> <span word="in">in</span> <span word="an">an</span> <span word="appearance">appearance</span> <span word="a">a</span> <span word="few">few</span> <span word="million">million</span> <span word="years">years</span> <span word="before">before</span> <span word="theCambrian">theCambrian</span> <span word="begins">begins</span>.</p><p> 海藻、类似水母的生物、海绵生物和奇怪的虫子确实在寒武纪开始的前几百万年已经出现。</p><p> <span word="But">But</span> <span word="red">red</span> <span word="in">in</span> <span word="tooth">tooth</span> <span word="and">and</span> <span word="claw">claw</span> <span word="the">the</span> <span word="Precambrian">Precambrian</span> <span word="was">was</span> <span word="notfor">notfor</span> <span word="neither">neither</span> <span word="teeth">teeth</span> <span word="nor">nor</span> <span word="claws">claws</span> <span word="existed">existed</span>.</p>
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