2016长沙市岳麓区高考英语完形填空和阅读理解一轮练习（10）及答案
<p> 阅读理解。</p><p> <span word="A">A</span> <span word="recent">recent</span> <span word="study">study</span> <span word="of">of</span> <span word="ancient">ancient</span> <span word="and">and</span> <span word="modern">modern</span> <span word="elephants">elephants</span> <span word="has">has</span> <span word="come">come</span> <span word="up">up</span> <span word="with">with</span> <span word="the">the</span> <span word="unexpected">unexpected</span> <span word="conclusion">conclusion</span> <span word="that">that</span> <span word="the">the</span> <span word="African">African</span> <span word="elephant">elephant</span> <span word="is">is</span> <span word="divided">divided</span> <span word="into">into</span> <span word="two">two</span> <span word="distinct">distinct</span>(不同的) <span word="species">species</span>.</p><p> <span word="The">The</span> <span word="discovery">discovery</span> <span word="was">was</span> <span word="made">made</span> <span word="by">by</span> <span word="researchers">researchers</span> <span word="at">at</span> <span word="York">York</span> <span word="and">and</span> <span word="Harvard">Harvard</span> <span word="Universities">Universities</span> <span word="when">when</span> <span word="they">they</span> <span word="were">were</span> <span word="examining">examining</span> <span word="the">the</span> <span word="genetic">genetic</span> <span word="relationship">relationship</span> <span word="between">between</span> <span word="the">the</span> <span word="ancient">ancient</span> <span word="woolly">woolly</span> <span word="mammoth">mammoth</span> <span word="and">and</span> <span word="mastodon">mastodon</span> <span word="to">to</span> <span word="modern">modern</span> <span word="elephants">elephants</span>—<span word="the">the</span> <span word="Asian">Asian</span> <span word="elephant">elephant</span>, <span word="African">African</span> <span word="forest">forest</span> <span word="elephant">elephant</span>, <span word="and">and</span> <span word="African">African</span> <span word="savanna">savanna</span> <span word="elephant">elephant</span>.</p><p> <span word="Once">Once</span> <span word="they">they</span> <span word="obtained">obtained</span> <span word="DNA">DNA</span> <span word="sequences">sequences</span> (序列)<span word="from">from</span> <span word="two">two</span> <span word="fossils">fossils</span> (化石), <span word="mammoths">mammoths</span> <span word="and">and</span> <span word="mastodons">mastodons</span>, <span word="the">the</span> <span word="team">team</span> <span word="compared">compared</span> <span word="them">them</span> <span word="with">with</span> <span word="DNA">DNA</span> <span word="from">from</span> <span word="modern">modern</span> <span word="elephants">elephants</span>. <span word="They">They</span> <span word="found">found</span> <span word="to">to</span> <span word="their">their</span> <span word="amazement">amazement</span> <span word="that">that</span> <span word="modern">modern</span> <span word="forest">forest</span> <span word="and">and</span> <span word="savanna">savanna</span> <span word="elephants">elephants</span> <span word="are">are</span> <span word="as">as</span> <span word="distinct">distinct</span> <span word="from">from</span> <span word="each">each</span> <span word="other">other</span> <span word="as">as</span> <span word="Asian">Asian</span> <span word="elephants">elephants</span> <span word="and">and</span> <span word="mammoths">mammoths</span>.</p><p> <span word="The">The</span> <span word="scientists">scientists</span> <span word="used">used</span> <span word="detailed">detailed</span> <span word="genetic">genetic</span> <span word="analysis">analysis</span> <span word="to">to</span> <span word="prove">prove</span> <span word="that">that</span> <span word="the">the</span> <span word="African">African</span> <span word="savanna">savanna</span> <span word="elephant">elephant</span> <span word="and">and</span> <span word="the">the</span> <span word="African">African</span> <span word="forest">forest</span> <span word="elephant">elephant</span> <span word="have">have</span> <span word="been">been</span> <span word="distinct">distinct</span> <span word="species">species</span> <span word="for">for</span> <span word="several">several</span> <span word="million">million</span> <span word="years">years</span>. <span word="The">The</span> <span word="divergence">divergence</span> <span word="of">of</span> <span word="the">the</span> <span word="two">two</span> <span word="species">species</span> <span word="took">took</span> <span word="place">place</span> <span word="around">around</span> <span word="the">the</span> <span word="time">time</span> <span word="of">of</span> <span word="the">the</span> <span word="divergence">divergence</span> <span word="of">of</span> <span word="Asian">Asian</span> <span word="elephants">elephants</span> <span word="and">and</span> <span word="woolly">woolly</span> <span word="mammoths">mammoths</span>. <span word="This">This</span> <span word="result">result</span> <span word="amazed">amazed</span> <span word="all">all</span> <span word="the">the</span> <span word="scientists">scientists</span>.</p><p> <span word="There">There</span> <span word="has">has</span> <span word="long">long</span> <span word="been">been</span> <span word="debate">debate</span> <span word="in">in</span> <span word="the">the</span> <span word="scientific">scientific</span> <span word="community">community</span> <span word="that">that</span> <span word="the">the</span> <span word="two">two</span> <span word="might">might</span> <span word="be">be</span> <span word="separate">separate</span> <span word="species">species</span>, <span word="but">but</span> <span word="this">this</span> <span word="is">is</span> <span word="the">the</span> <span word="most">most</span> <span word="convincing">convincing</span> <span word="scientific">scientific</span> <span word="evidence">evidence</span> <span word="so">so</span> <span word="far">far</span> <span word="that">that</span> <span word="they">they</span> <span word="are">are</span> <span word="indeed">indeed</span> <span word="different">different</span> <span word="species">species</span>.</p><p> <span word="Previously">Previously</span>, <span word="many">many</span> <span word="naturalists">naturalists</span> <span word="believed">believed</span> <span word="that">that</span> <span word="African">African</span> <span word="savanna">savanna</span> <span word="elephants">elephants</span> <span word="and">and</span> <span word="African">African</span> <span word="forest">forest</span> <span word="elephants">elephants</span> <span word="were">were</span> <span word="two">two</span> <span word="populations">populations</span> <span word="of">of</span> <span word="the">the</span> <span word="same">same</span> <span word="species">species</span>, <span word="despite">despite</span> <span word="the">the</span> <span word="elephants">elephants</span>' <span word="significant">significant</span> <span word="size">size</span> <span word="differences">differences</span>. <span word="The">The</span> <span word="savanna">savanna</span> <span word="elephant">elephant</span> <span word="has">has</span> <span word="an">an</span> <span word="average">average</span> <span word="shoulder">shoulder</span> <span word="height">height</span> <span word="of">of</span> 3.5 <span word="metres">metres</span> <span word="while">while</span> <span word="the">the</span> <span word="forest">forest</span> <span word="elephant">elephant</span> <span word="has">has</span> <span word="an">an</span> <span word="average">average</span> <span word="shoulder">shoulder</span> <span word="height">height</span> <span word="of">of</span> 2.5 <span word="metres">metres</span>. <span word="The">The</span> <span word="savanna">savanna</span> <span word="elephant">elephant</span> <span word="weighs">weighs</span> <span word="between">between</span> <span word="six">six</span> <span word="and">and</span> <span word="seven">seven</span> <span word="tons">tons</span>, <span word="roughly">roughly</span> <span word="double">double</span> <span word="the">the</span> <span word="weight">weight</span> <span word="of">of</span> <span word="the">the</span> <span word="forest">forest</span> <span word="elephant">elephant</span>. <span word="But">But</span> <span word="the">the</span> <span word="fact">fact</span> <span word="that">that</span> <span word="they">they</span> <span word="look">look</span> <span word="so">so</span> <span word="different">different</span> <span word="does">does</span> <span word="not">not</span> <span word="necessarily">necessarily</span> <span word="mean">mean</span> <span word="they">they</span> <span word="are">are</span> <span word="different">different</span> <span word="species">species</span>. <span word="However">However</span> <span word="the">the</span> <span word="proof">proof</span> <span word="lay">lay</span> <span word="in">in</span> <span word="the">the</span> <span word="analysis">analysis</span> <span word="of">of</span> <span word="the">the</span> <span word="DNA">DNA</span>.</p>
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