2017届高考英语二轮专题复习 阅读理解部分之限时训练（四）
<p> 2017届高考英语二轮专题复习精品之<span word="A">A</span> <span word="breathtaking">breathtaking</span> <span word="trick">trick</span> <span word="potentially">potentially</span> <span word="left">left</span> <span word="over">over</span> <span word="from">from</span> <span word="our">our</span> <span word="ancestors">ancestors</span> <span word="might">might</span> <span word="be">be</span> <span word="found">found</span> <span word="in">in</span> <span word="us">us</span> — <span word="the">the</span> <span word="ability">ability</span> <span word="to">to</span> <span word="sense">sense</span> <span word="oxygen">oxygen</span> <span word="through">through</span> <span word="our">our</span> <span word="skin">skin</span>.</p><p> <span word="Amphibians">Amphibians</span>(两栖动物), <span word="animals">animals</span> <span word="such">such</span> <span word="as">as</span> <span word="frogs">frogs</span> <span word="that">that</span> <span word="can">can</span> <span word="live">live</span> <span word="both">both</span> <span word="on">on</span> <span word="land">land</span> <span word="and">and</span> <span word="in">in</span> <span word="water">water</span>, <span word="have">have</span> <span word="long">long</span> <span word="been">been</span> <span word="known">known</span> <span word="to">to</span> <span word="be">be</span> <span word="capable">capable</span> <span word="of">of</span> <span word="breathing">breathing</span> <span word="through">through</span> <span word="their">their</span> <span word="skin">skin</span>. <span word="In">In</span> <span word="fact">fact</span>, <span word="the">the</span> <span word="first">first</span> <span word="known">known</span> <span word="lungless">lungless</span> <span word="frog">frog</span> <span word="that">that</span> <span word="breathes">breathes</span> <span word="only">only</span> <span word="through">through</span> <span word="its">its</span> <span word="skin">skin</span> <span word="was">was</span> <span word="discovered">discovered</span> <span word="recently">recently</span> <span word="in">in</span> <span word="the">the</span> <span word="rivers">rivers</span> <span word="of">of</span> <span word="Borneo">Borneo</span>.</p><p> <span word="Now">Now</span> <span word="the">the</span> <span word="same">same</span> <span word="oxygen">oxygen</span> <span word="sensors">sensors</span> <span word="found">found</span> <span word="in">in</span> <span word="frog">frog</span> <span word="skins">skins</span> <span word="and">and</span> <span word="in">in</span> <span word="the">the</span> <span word="lungs">lungs</span> <span word="of">of</span> <span word="mammals">mammals</span> <span word="have">have</span> <span word="unexpectedly">unexpectedly</span> <span word="been">been</span> <span word="discovered">discovered</span> <span word="in">in</span> <span word="the">the</span> <span word="skin">skin</span> <span word="of">of</span> <span word="mice">mice</span>.</p><p> “<span word="No">No</span> <span word="one">one</span> <span word="had">had</span> <span word="ever">ever</span> <span word="looked">looked</span>,” <span word="explained">explained</span> <span word="Randall">Randall</span> <span word="Johnson">Johnson</span>, <span word="a">a</span> <span word="biologist">biologist</span> <span word="researcher">researcher</span>.</p><p> <span word="Mice">Mice</span> <span word="and">and</span> <span word="frogs">frogs</span> <span word="are">are</span> <span word="quite">quite</span> <span word="distant">distant</span> <span word="relatives">relatives</span>, <span word="so">so</span> <span word="the">the</span> <span word="fact">fact</span> <span word="they">they</span> <span word="have">have</span> <span word="these">these</span> <span word="molecules">molecules</span> (分子) <span word="in">in</span> <span word="common">common</span> <span word="in">in</span> <span word="their">their</span> <span word="skin">skin</span> <span word="suggests">suggests</span> <span word="they">they</span> <span word="might">might</span> <span word="well">well</span> <span word="be">be</span> <span word="found">found</span> <span word="in">in</span> <span word="the">the</span> <span word="skin">skin</span> <span word="of">of</span> <span word="other">other</span> <span word="mammals">mammals</span>, <span word="such">such</span> <span word="as">as</span> <span word="humans">humans</span>.</p><p> “<span word="We">We</span> <span word="have">have</span> <span word="no">no</span> <span word="reason">reason</span> <span word="to">to</span> <span word="think">think</span> <span word="that">that</span> <span word="they">they</span> <span word="are">are</span> <span word="not">not</span> <span word="in">in</span> <span word="the">the</span> <span word="skin">skin</span> <span word="of">of</span> <span word="people">people</span> <span word="too">too</span>,” <span word="Johnson">Johnson</span> <span word="said">said</span>.</p><p> <span word="These">These</span> <span word="molecules">molecules</span> <span word="not">not</span> <span word="only">only</span> <span word="detect">detect</span> <span word="oxygen">oxygen</span>, <span word="but">but</span> <span word="help">help</span> <span word="increase">increase</span> <span word="levels">levels</span> <span word="of">of</span> <span word="vital">vital</span> <span word="red">red</span> <span word="blood">blood</span> <span word="cells">cells</span>, <span word="which">which</span> <span word="carry">carry</span> <span word="oxygen">oxygen</span> <span word="around">around</span> <span word="the">the</span> <span word="body">body</span>. <span word="Normal">Normal</span> <span word="mice">mice</span> <span word="breathing">breathing</span> <span word="in">in</span> <span word="air">air</span> <span word="that">that</span> <span word="is">is</span> 10 <span word="percent">percent</span> <span word="oxygen">oxygen</span>—<span word="a">a</span> <span word="dangerously">dangerously</span> <span word="low">low</span> <span word="level">level</span> <span word="similar">similar</span> <span word="to">to</span> <span word="conditions">conditions</span> <span word="at">at</span> <span word="the">the</span> <span word="top">top</span> <span word="of">of</span> <span word="Mount">Mount</span> <span word="Everest">Everest</span>, <span word="and">and</span> <span word="about">about</span> <span word="half">half</span> <span word="that">that</span> <span word="of">of</span> <span word="air">air</span> <span word="at">at</span> <span word="sea">sea</span> <span word="level">level</span>. <span word="However">However</span>, <span word="mice">mice</span> <span word="that">that</span> <span word="had">had</span> <span word="the">the</span> <span word="oxygen">oxygen</span> <span word="sensor">sensor</span> <span word="HIF">HIF</span>-1 <span word="a">a</span> <span word="genetically">genetically</span> <span word="removed">removed</span> <span word="from">from</span> <span word="their">their</span> <span word="skin">skin</span> <span word="failed">failed</span> <span word="to">to</span> <span word="produce">produce</span> <span word="this">this</span> <span word="hormone">hormone</span> (荷尔蒙) <span word="even">even</span> <span word="after">after</span> <span word="hours">hours</span> <span word="of">of</span> <span word="such">such</span> <span word="low">low</span> <span word="oxygen">oxygen</span>.</p>
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