英语六级听力练习：标准4.9(5)
<p> 找不到好的英语六级听力练习材料?绝对是你的不二选择。大家平时多用英语磨耳朵，时间长了英语六级听力绝对会有很大的提高。</p><p> 英语六级听力练习：标准4.9 点击收听</p><p> <span word="Scientists">Scientists</span> <span word="have">have</span> <span word="discovered">discovered</span> <span word="the">the</span> <span word="worlds">worlds</span> <span word="earliest">earliest</span> <span word="known">known</span> <span word="cardiovascular">cardiovascular</span> <span word="system">system</span> - <span word="heart">heart</span> <span word="and">and</span> <span word="blood">blood</span> <span word="vessels">vessels</span> - <span word="in">in</span> <span word="the">the</span> <span word="fossil">fossil</span> <span word="of">of</span> <span word="a">a</span> <span word="shrimp">shrimp</span>-<span word="like">like</span> <span word="creature">creature</span> <span word="from">from</span> <span word="more">more</span> <span word="than">than</span> 500 <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>. <span word="The">The</span> <span word="rare">rare</span> <span word="find">find</span> <span word="sheds">sheds</span> <span word="new">new</span> <span word="light">light</span> <span word="on">on</span> <span word="the">the</span> <span word="evolutionary">evolutionary</span> <span word="timeline">timeline</span> <span word="of">of</span> <span word="life">life</span> <span word="on">on</span> <span word="Earth">Earth</span>.</p><p> <span word="The">The</span> <span word="Yunnan">Yunnan</span> <span word="Province">Province</span> <span word="in">in</span> <span word="southwestern">southwestern</span> <span word="China">China</span> <span word="is">is</span> <span word="known">known</span> <span word="for">for</span> <span word="rich">rich</span> <span word="fossil">fossil</span> <span word="deposits">deposits</span>, <span word="but">but</span> <span word="researchers">researchers</span> <span word="had">had</span> <span word="not">not</span> <span word="expected">expected</span> <span word="a">a</span> <span word="fossil">fossil</span> <span word="so">so</span> <span word="exquisitely">exquisitely</span> <span word="preserved">preserved</span> <span word="as">as</span> <span word="the">the</span> <span word="specimen">specimen</span> <span word="of">of</span> <span word="the">the</span> 520-<span word="million">million</span>-<span word="year">year</span>-<span word="old">old</span> <span word="shrimp">shrimp</span>-<span word="like">like</span> <span word="species">species</span>.</p><p> <span word="Researcher">Researcher</span> <span word="Peiyun">Peiyun</span> <span word="Cong">Cong</span> <span word="with">with</span> <span word="the">the</span> <span word="Yunnan">Yunnan</span> <span word="Laboratory">Laboratory</span> <span word="for">for</span> <span word="Paleobiology">Paleobiology</span> <span word="unearthed">unearthed</span> <span word="the">the</span> <span word="fossil">fossil</span>, <span word="which">which</span> <span word="gave">gave</span> <span word="researchers">researchers</span> <span word="the">the</span> <span word="first">first</span> <span word="detailed">detailed</span> <span word="image">image</span> <span word="of">of</span> <span word="the">the</span> <span word="creatures">creatures</span> <span word="circulatory">circulatory</span> <span word="system">system</span>.</p><p> [<span word="The">The</span> <span word="fossil">fossil</span>] <span word="is">is</span> <span word="a">a</span> <span word="beautiful">beautiful</span> <span word="carbon">carbon</span> <span word="trace">trace</span>, <span word="said">said</span> <span word="University">University</span> <span word="of">of</span> <span word="Arizona">Arizona</span> <span word="neuroscientist">neuroscientist</span> <span word="and">and</span> <span word="team">team</span> <span word="member">member</span> <span word="Nicholas">Nicholas</span> <span word="Strausfeld">Strausfeld</span>. <span word="It">It</span> <span word="is">is</span> <span word="bilaterally">bilaterally</span> <span word="symmetrical">symmetrical</span>. <span word="It">It</span> <span word="shows">shows</span> <span word="the">the</span> <span word="dorsal">dorsal</span> <span word="blood">blood</span> <span word="vessel">vessel</span> <span word="and">and</span> <span word="the">the</span> <span word="lateral">lateral</span> <span word="vascular">vascular</span> <span word="components">components</span>, <span word="the">the</span> <span word="arteries">arteries</span>, <span word="the">the</span> <span word="lateral">lateral</span> <span word="arteries">arteries</span> <span word="and">and</span> <span word="then">then</span> <span word="a">a</span> <span word="very">very</span>, <span word="very">very</span>, <span word="beautiful">beautiful</span>, <span word="system">system</span> <span word="of">of</span> <span word="arteries">arteries</span> <span word="over">over</span> <span word="where">where</span> <span word="the">the</span> <span word="brain">brain</span> <span word="sits">sits</span> <span word="in">in</span> <span word="the">the</span> <span word="head">head</span>.</p><p> <span word="In">In</span> <span word="earlier">earlier</span> <span word="research">research</span> <span word="with">with</span> <span word="fossils">fossils</span> <span word="of">of</span> <span word="the">the</span> <span word="same">same</span> <span word="species">species</span>, <span word="the">the</span> <span word="scientists">scientists</span> <span word="on">on</span> <span word="this">this</span> <span word="project">project</span> <span word="had">had</span> <span word="identified">identified</span> <span word="its">its</span> <span word="brain">brain</span>, <span word="gut">gut</span> <span word="and">and</span> <span word="nervous">nervous</span> <span word="system">system</span>.</p>
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