英语六级考试冲刺练习阅读篇68
<p> <span word="You">You</span> <span word="have">have</span> <span word="learned">learned</span> <span word="that">that</span> <span word="dissolved">dissolved</span> <span word="materials">materials</span> <span word="always">always</span> <span word="diffuse">diffuse</span> <span word="from">from</span> <span word="where">where</span> <span word="there">there</span> <span word="is">is</span> <span word="more">more</span> <span word="of">of</span> <span word="them">them</span> <span word="to">to</span> <span word="where">where</span> <span word="there">there</span> <span word="is">is</span> <span word="less">less</span>. <span word="Oxygen">Oxygen</span> <span word="from">from</span> <span word="the">the</span> <span word="air">air</span> <span word="dissolves">dissolves</span> <span word="in">in</span> <span word="the">the</span> <span word="moisture">moisture</span> <span word="on">on</span> <span word="the">the</span> <span word="lining">lining</span> <span word="of">of</span> <span word="the">the</span> <span word="air">air</span> <span word="sac">sac</span> <span word="and">and</span> <span word="diffuses">diffuses</span> <span word="through">through</span> <span word="the">the</span> <span word="lining">lining</span> <span word="into">into</span> <span word="the">the</span> <span word="blood">blood</span>. <span word="Meanwhile">Meanwhile</span>, <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="diffuses">diffuses</span> <span word="from">from</span> <span word="the">the</span> <span word="blood">blood</span> <span word="into">into</span> <span word="the">the</span> <span word="air">air</span> <span word="sac">sac</span>. <span word="The">The</span> <span word="blood">blood</span> <span word="then">then</span> <span word="flows">flows</span> <span word="from">from</span> <span word="the">the</span> <span word="lungs">lungs</span> <span word="back">back</span> <span word="to">to</span> <span word="the">the</span> <span word="heart">heart</span>, <span word="which">which</span> <span word="sends">sends</span> <span word="it">it</span> <span word="out">out</span> <span word="to">to</span> <span word="all">all</span> <span word="other">other</span> <span word="parts">parts</span> <span word="of">of</span> <span word="the">the</span> <span word="body">body</span>. <span word="Soon">Soon</span> <span word="after">after</span> <span word="air">air</span> <span word="goes">goes</span> <span word="into">into</span> <span word="an">an</span> <span word="air">air</span> <span word="sac">sac</span>, <span word="it">it</span> <span word="gives">gives</span> <span word="up">up</span> <span word="some">some</span> <span word="of">of</span> <span word="its">its</span> <span word="oxygen">oxygen</span> <span word="and">and</span> <span word="takes">takes</span> <span word="in">in</span> <span word="some">some</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="from">from</span> <span word="the">the</span> <span word="blood">blood</span>. <span word="To">To</span> <span word="keep">keep</span> <span word="diffusion">diffusion</span> <span word="going">going</span> <span word="as">as</span> <span word="it">it</span> <span word="should">should</span>, <span word="this">this</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="must">must</span> <span word="be">be</span> <span word="gotten">gotten</span> <span word="rid">rid</span> <span word="of">of</span>. <span word="Breathing">Breathing</span>, <span word="which">which</span> <span word="is">is</span> <span word="caused">caused</span> <span word="by">by</span> <span word="movements">movements</span> <span word="of">of</span> <span word="the">the</span> <span word="chest">chest</span>, <span word="forces">forces</span> <span word="the">the</span> <span word="used">used</span> <span word="air">air</span> <span word="out">out</span> <span word="of">of</span> <span word="the">the</span> <span word="air">air</span> <span word="sacs">sacs</span> <span word="in">in</span> <span word="your">your</span> <span word="lungs">lungs</span> <span word="and">and</span> <span word="brings">brings</span> <span word="in">in</span> <span word="fresh">fresh</span> <span word="air">air</span>. <span word="The">The</span> <span word="breathing">breathing</span> <span word="muscles">muscles</span> <span word="are">are</span> <span word="controlled">controlled</span> <span word="automatically">automatically</span> <span word="so">so</span> <span word="that">that</span> <span word="you">you</span> <span word="breathe">breathe</span> <span word="at">at</span> <span word="the">the</span> <span word="proper">proper</span> <span word="rate">rate</span> <span word="to">to</span> <span word="keep">keep</span> <span word="your">your</span> <span word="air">air</span> <span word="sacs">sacs</span> <span word="supplied">supplied</span> <span word="with">with</span> <span word="fresh">fresh</span> <span word="air">air</span>. <span word="Ordinarily">Ordinarily</span>, <span word="you">you</span> <span word="breathe">breathe</span> <span word="about">about</span> <span word="twenty">twenty</span>-<span word="two">two</span> <span word="times">times</span> <span word="a">a</span> <span word="minute">minute</span>. <span word="Of">Of</span> <span word="course">course</span>, <span word="you">you</span> <span word="breathe">breathe</span> <span word="faster">faster</span> <span word="when">when</span> <span word="you">you</span> <span word="are">are</span> <span word="exercising">exercising</span> <span word="and">and</span> <span word="slower">slower</span> <span word="when">when</span> <span word="you">you</span> <span word="are">are</span> <span word="resting">resting</span>. <span word="Fresh">Fresh</span> <span word="air">air</span> <span word="is">is</span> <span word="brought">brought</span> <span word="into">into</span> <span word="your">your</span> <span word="lungs">lungs</span> <span word="when">when</span> <span word="you">you</span> <span word="breathe">breathe</span> <span word="in">in</span>, <span word="or">or</span> <span word="inhale">inhale</span>, <span word="while">while</span> <span word="used">used</span> <span word="air">air</span> <span word="is">is</span> <span word="forced">forced</span> <span word="out">out</span> <span word="of">of</span> <span word="your">your</span> <span word="lungs">lungs</span> <span word="when">when</span> <span word="you">you</span> <span word="breathe">breathe</span> <span word="out">out</span>, <span word="or">or</span> <span word="exhale">exhale</span>. 26. <span word="In">In</span> <span word="the">the</span> <span word="respiratory">respiratory</span> <span word="process">process</span>, <span word="only">only</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="actions">actions</span> <span word="takes">takes</span> <span word="place">place</span>: <span word="it">it</span> <span word="is">is</span>_______. <span word="A">A</span>. <span word="the">the</span> <span word="diffusion">diffusion</span> <span word="of">of</span> <span word="blood">blood</span> <span word="through">through</span> <span word="capillary">capillary</span> <span word="walls">walls</span> <span word="into">into</span> <span word="air">air</span> <span word="sacs">sacs</span> <span word="B">B</span>. <span word="the">the</span> <span word="diffusion">diffusion</span> <span word="of">of</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="through">through</span> <span word="capillary">capillary</span> <span word="and">and</span> <span word="air">air</span> <span word="sac">sac</span> <span word="walls">walls</span> <span word="into">into</span> <span word="the">the</span> <span word="blood">blood</span> <span word="C">C</span>. <span word="the">the</span> <span word="diffusion">diffusion</span> <span word="of">of</span> <span word="oxygen">oxygen</span> <span word="through">through</span> <span word="the">the</span> <span word="air">air</span> <span word="sac">sac</span> <span word="and">and</span> <span word="capillary">capillary</span> <span word="walls">walls</span> <span word="into">into</span> <span word="the">the</span> <span word="blood">blood</span> <span word="D">D</span>. <span word="the">the</span> <span word="exchange">exchange</span> <span word="of">of</span> <span word="nitrogen">nitrogen</span> <span word="within">within</span> <span word="air">air</span> <span word="sacs">sacs</span> 27. <span word="The">The</span> <span word="number">number</span> <span word="of">of</span> <span word="times">times</span> <span word="per">per</span> <span word="minute">minute</span> <span word="that">that</span> <span word="you">you</span> <span word="breathe">breathe</span> <span word="is">is</span>_______. <span word="A">A</span>. <span word="independent">independent</span> <span word="of">of</span> <span word="your">your</span> <span word="rate">rate</span> <span word="of">of</span> <span word="exercise">exercise</span> <span word="B">B</span>. <span word="fixed">fixed</span> <span word="at">at</span> <span word="twenty">twenty</span>-<span word="two">two</span> <span word="times">times</span> <span word="per">per</span> <span word="minute">minute</span> <span word="C">C</span>. <span word="influenced">influenced</span> <span word="by">by</span> <span word="your">your</span> <span word="age">age</span> <span word="and">and</span> <span word="sex">sex</span> <span word="D">D</span>. <span word="controlled">controlled</span> <span word="automatically">automatically</span> <span word="by">by</span> <span word="an">an</span> <span word="unspecified">unspecified</span> <span word="body">body</span> <span word="mechanism">mechanism</span> 28. <span word="The">The</span> <span word="process">process</span> <span word="by">by</span> <span word="which">which</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="and">and</span> <span word="oxygen">oxygen</span> <span word="are">are</span> <span word="transferred">transferred</span> <span word="does">does</span> <span word="not">not</span> <span word="depend">depend</span> <span word="on">on</span> <span word="A">A</span>. <span word="the">the</span> <span word="presence">presence</span> <span word="of">of</span> <span word="nitrogen">nitrogen</span> <span word="in">in</span> <span word="the">the</span> <span word="blood">blood</span> <span word="B">B</span>. <span word="breathing">breathing</span> <span word="muscles">muscles</span> <span word="C">C</span>. <span word="the">the</span> <span word="flow">flow</span> <span word="of">of</span> <span word="blood">blood</span> <span word="D">D</span>. <span word="the">the</span> <span word="moisture">moisture</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span> <span word="sac">sac</span> <span word="linings">linings</span> 29. <span word="The">The</span> <span word="authors">authors</span> <span word="style">style</span> <span word="in">in</span> <span word="this">this</span> <span word="passage">passage</span> <span word="can">can</span> <span word="best">best</span> <span word="be">be</span> <span word="described">described</span> <span word="as">as</span>---------. <span word="A">A</span> <span word="informal">informal</span> <span word="and">and</span> <span word="matter">matter</span> <span word="of">of</span> <span word="fact">fact</span> <span word="B">B</span>. <span word="impersonal">impersonal</span> <span word="C">C</span>. <span word="personal">personal</span> <span word="P">P</span>- <span word="matter">matter</span> <span word="of">of</span> <span word="fact">fact</span> <span word="and">and</span> <span word="formal">formal</span> 30. <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="words">words</span> <span word="can">can</span> <span word="replace">replace</span> <span word="the">the</span> <span word="word">word</span> <span word="exhale">exhale</span>? <span word="A">A</span>. <span word="Breathe">Breathe</span> <span word="out">out</span>. <span word="B">B</span>. <span word="Breathe">Breathe</span> <span word="in">in</span>. <span word="C">C</span>. <span word="Diffuse">Diffuse</span>. <span word="D">D</span>. <span word="Exchange">Exchange</span>. </p>
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