2015考研英语阅读羽毛化石
<p> <span word="Fossil">Fossil</span> <span word="feathers">feathers</span></p><p> 羽毛化石</p><p> <span word="Not">Not</span> <span word="just">just</span> <span word="for">for</span> <span word="the">the</span> <span word="birds">birds</span></p><p> 并非鸟类独有</p><p> <span word="A">A</span> <span word="trove">trove</span> <span word="of">of</span> <span word="fossils">fossils</span> <span word="sheds">sheds</span> <span word="light">light</span> <span word="on">on</span> <span word="the">the</span> <span word="evolution">evolution</span> <span word="of">of</span> <span word="feathers">feathers</span></p><p> 珍贵羽毛化石的发现能够更好地阐释羽毛的进化过程</p><p> <span word="THE">THE</span> <span word="fossil">fossil</span> <span word="record">record</span> <span word="is">is</span>, <span word="famously">famously</span>, <span word="full">full</span> <span word="of">of</span> <span word="holes">holes</span>.</p><p> 众所周知，化石记录总是漏洞百出。</p><p> <span word="One">One</span> <span word="such">such</span> <span word="lacuna">lacuna</span> <span word="has">has</span> <span word="been">been</span> <span word="the">the</span> <span word="absence">absence</span> <span word="of">of</span> <span word="well">well</span>-<span word="preserved">preserved</span> <span word="feathers">feathers</span> <span word="from">from</span> <span word="the">the</span> <span word="Cretaceous">Cretaceous</span>-<span word="theperiod">theperiod</span> <span word="between">between</span> 145<span word="m">m</span> <span word="and">and</span> 65<span word="m">m</span> <span word="years">years</span> <span word="ago">ago</span> <span word="that">that</span> <span word="ended">ended</span> <span word="with">with</span> <span word="the">the</span> <span word="mass">mass</span> <span word="extinction">extinction</span> <span word="that">that</span> <span word="wipedout">wipedout</span> <span word="the">the</span> <span word="dinosaurs">dinosaurs</span>.</p><p> 一个漏洞就是由于人们无法找到白垩纪时期保存完好的羽毛，因而该时期羽毛化石的记录一直处于空白状态。白垩纪是距今1.45亿年到6500万年的一段时期，末期发生了导致恐龙消失的物种大灭绝。</p><p> <span word="Now">Now</span>, <span word="this">this</span> <span word="gap">gap</span> <span word="has">has</span> <span word="been">been</span> <span word="partly">partly</span> <span word="filled">filled</span>.</p><p> 如今，这段空白得到了部分填充。</p><p> <span word="In">In</span> <span word="this">this</span> <span word="week">week</span> <span word="s">s</span> <span word="Science">Science</span>, <span word="a">a</span> <span word="team">team</span> <span word="led">led</span> <span word="by">by</span> <span word="Ryan">Ryan</span> <span word="McKellar">McKellar</span> <span word="from">from</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Alberta">Alberta</span> <span word="report">report</span> <span word="thediscovery">thediscovery</span> <span word="of">of</span> <span word="eleven">eleven</span> <span word="feathers">feathers</span> <span word="preserved">preserved</span> <span word="in">in</span> <span word="amber">amber</span> <span word="from">from</span> <span word="the">the</span> <span word="latter">latter</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="Cretaceous">Cretaceous</span>,<span word="about">about</span> 70<span word="m">m</span>-85<span word="m">m</span> <span word="years">years</span> <span word="ago">ago</span>.</p><p> 本周，瑞安?麦凯乐领导的研究小组在《科学》杂志上发表报告称，他们发现了11种白垩纪后期封存在琥珀里的羽毛。</p>
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