湖南省邵东县2016届英语一轮单项选择和阅读理解精炼（5）
<p> 湖南省邵东县2016高考英语单项选择和阅读理解精炼（5）</p><p> 阅读下列四篇短文，从每小题后所给的<span word="A">A</span>,<span word="B">B</span>,<span word="C">C</span>或<span word="D">D</span>四个选项中，选出最佳选项。</p><p> <span word="Below">Below</span> <span word="is">is</span> <span word="a">a</span> <span word="selection">selection</span> <span word="from">from</span> <span word="a">a</span> <span word="popular">popular</span> <span word="science">science</span> <span word="book">book</span>.</p><p> <span word="If">If</span> <span word="blood">blood</span> <span word="is">is</span> <span word="red">red</span>，<span word="why">why</span> <span word="are">are</span> <span word="veins">veins</span>(静脉) <span word="blue">blue</span>?</p><p> <span word="Actually">Actually</span>，<span word="veins">veins</span> <span word="are">are</span> <span word="not">not</span> <span word="blue">blue</span> <span word="at">at</span> <span word="all">all</span>.<span word="They">They</span> <span word="are">are</span> <span word="more">more</span> <span word="of">of</span> <span word="a">a</span> <span word="clear">clear</span>，<span word="yellowish">yellowish</span> <span word="colour">colour</span>.<span word="Although">Although</span> <span word="blood">blood</span> <span word="looks">looks</span> <span word="red">red</span> <span word="when">when</span> <span word="it">it</span>'<span word="s">s</span> <span word="outside">outside</span> <span word="the">the</span> <span word="body">body</span>，<span word="when">when</span> <span word="it">it</span>'<span word="s">s</span> <span word="sitting">sitting</span> <span word="in">in</span> <span word="a">a</span> <span word="vein">vein</span> <span word="near">near</span> <span word="the">the</span> <span word="surface">surface</span> <span word="of">of</span> <span word="the">the</span> <span word="skin">skin</span>，<span word="it">it</span>'<span word="s">s</span> <span word="more">more</span> <span word="of">of</span> <span word="a">a</span> <span word="dark">dark</span> <span word="reddish">reddish</span> <span word="purple">purple</span> <span word="colour">colour</span>.<span word="At">At</span> <span word="the">the</span> <span word="right">right</span> <span word="depth">depth</span>，<span word="these">these</span> <span word="blood">blood</span><span word="filled">filled</span> <span word="veins">veins</span> <span word="reflect">reflect</span> <span word="less">less</span> <span word="red">red</span> <span word="light">light</span> <span word="than">than</span> <span word="the">the</span> <span word="surrounding">surrounding</span> <span word="skin">skin</span>，<span word="making">making</span> <span word="them">them</span> <span word="look">look</span> <span word="blue">blue</span> <span word="by">by</span> <span word="comparison">comparison</span>.</p><p> <span word="Which">Which</span> <span word="works">works</span> <span word="harder">harder</span>，<span word="your">your</span> <span word="heart">heart</span> <span word="or">or</span> <span word="your">your</span> <span word="brain">brain</span>?</p><p> <span word="That">That</span> <span word="kind">kind</span> <span word="of">of</span> <span word="depends">depends</span> <span word="on">on</span> <span word="whether">whether</span> <span word="you">you</span>'<span word="re">re</span> <span word="busy">busy</span> <span word="thinking">thinking</span> <span word="or">or</span> <span word="busy">busy</span> <span word="exercising">exercising</span>.<span word="Your">Your</span> <span word="heart">heart</span> <span word="works">works</span> <span word="up">up</span> <span word="to">to</span> <span word="three">three</span> <span word="times">times</span> <span word="harder">harder</span> <span word="during">during</span> <span word="exercise">exercise</span>，<span word="and">and</span> <span word="shifts">shifts</span> <span word="enough">enough</span> <span word="blood">blood</span> <span word="over">over</span> <span word="a">a</span> <span word="lifetime">lifetime</span> <span word="to">to</span> <span word="fill">fill</span> <span word="a">a</span> <span word="supertanker">supertanker</span>.<span word="But">But</span>，<span word="in">in</span> <span word="the">the</span> <span word="long">long</span> <span word="run">run</span>，<span word="your">your</span> <span word="brain">brain</span> <span word="probably">probably</span> <span word="tips">tips</span> <span word="it">it</span>，<span word="because">because</span> <span word="even">even</span> <span word="when">when</span> <span word="you">you</span>'<span word="re">re</span> <span word="sitting">sitting</span> <span word="still">still</span> <span word="your">your</span> <span word="brain">brain</span> <span word="is">is</span> <span word="using">using</span> <span word="twice">twice</span> <span word="as">as</span> <span word="much">much</span> <span word="energy">energy</span> <span word="as">as</span> <span word="your">your</span> <span word="heart">heart</span>，<span word="and">and</span> <span word="it">it</span> <span word="takes">takes</span> <span word="four">four</span> <span word="to">to</span> <span word="five">five</span> <span word="times">times</span> <span word="as">as</span> <span word="much">much</span> <span word="blood">blood</span> <span word="to">to</span> <span word="feed">feed</span> <span word="it">it</span>.</p><p> <span word="Why">Why</span> <span word="do">do</span> <span word="teeth">teeth</span> <span word="fall">fall</span> <span word="out">out</span>，<span word="and">and</span> <span word="why">why</span> <span word="don">don</span>'<span word="t">t</span> <span word="they">they</span> <span word="grow">grow</span> <span word="back">back</span> <span word="in">in</span> <span word="grown">grown</span><span word="ups">ups</span>?</p><p> <span word="Baby">Baby</span> (<span word="or">or</span> “<span word="milk">milk</span>”) <span word="teeth">teeth</span> <span word="do">do</span> <span word="not">not</span> <span word="last">last</span> <span word="long">long</span>；<span word="they">they</span> <span word="fall">fall</span> <span word="out">out</span> <span word="to">to</span> <span word="make">make</span> <span word="room">room</span> <span word="for">for</span> <span word="bigger">bigger</span>，<span word="stronger">stronger</span> <span word="adult">adult</span> <span word="teeth">teeth</span> <span word="later">later</span> <span word="on">on</span>.<span word="Adult">Adult</span> <span word="teeth">teeth</span> <span word="fall">fall</span> <span word="out">out</span> <span word="when">when</span> <span word="they">they</span> <span word="become">become</span> <span word="damaged">damaged</span>，<span word="decayed">decayed</span> <span word="and">and</span> <span word="infected">infected</span> <span word="by">by</span> <span word="bacteria">bacteria</span>.<span word="Once">Once</span> <span word="this">this</span> <span word="second">second</span> <span word="set">set</span> <span word="of">of</span> <span word="teeth">teeth</span> <span word="has">has</span> <span word="grown">grown</span> <span word="in">in</span>，<span word="you">you</span>'<span word="re">re</span> <span word="done">done</span>.<span word="When">When</span> <span word="they">they</span>'<span word="re">re</span> <span word="gone">gone</span>，<span word="they">they</span>'<span word="re">re</span> <span word="gone">gone</span>.<span word="This">This</span> <span word="is">is</span> <span word="because">because</span> <span word="nature">nature</span> <span word="figures">figures</span> <span word="you">you</span>'<span word="re">re</span> <span word="set">set</span> <span word="for">for</span> <span word="life">life</span>，<span word="and">and</span> <span word="what">what</span> <span word="controls">controls</span> <span word="regrowth">regrowth</span> <span word="of">of</span> <span word="your">your</span> <span word="teeth">teeth</span> <span word="switches">switches</span> <span word="off">off</span>.</p>
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