gre阅读练习每日一篇(十八)
<p> 掌握了<span word="gre">gre</span>阅读里的长难句，到了实战演习的时候了。<span word="gre">gre</span>阅读练习每日一篇帮助<span word="gre">gre</span>考生循序渐进地进行练习和总结。希望<span word="gre">gre</span>考生在进行<span word="gre">gre</span>阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。</p><p> <span word="The">The</span> <span word="dark">dark</span> <span word="regions">regions</span> <span word="in">in</span> <span word="the">the</span> <span word="starry">starry</span> <span word="night">night</span> <span word="sky">sky</span> <span word="are">are</span> <span word="not">not</span> <span word="pockets">pockets</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span> <span word="that">that</span> <span word="are">are</span> <span word="devoid">devoid</span> <span word="of">of</span> <span word="stars">stars</span> <span word="as">as</span> <span word="had">had</span> <span word="long">long</span> <span word="been">been</span> <span word="thought">thought</span>. <span word="Rather">Rather</span>, <span word="they">they</span> <span word="are">are</span> <span word="dark">dark</span> <span word="because">because</span> <span word="of">of</span> <span word="interstellar">interstellar</span> <span word="dust">dust</span> <span word="that">that</span> <span word="hides">hides</span> <span word="the">the</span> <span word="stars">stars</span> <span word="behind">behind</span> <span word="it">it</span>. <span word="Although">Although</span> <span word="its">its</span> <span word="visual">visual</span> <span word="effect">effect</span> <span word="is">is</span> <span word="so">so</span> <span word="pronounced">pronounced</span>, <span word="dust">dust</span> <span word="is">is</span> <span word="only">only</span> <span word="a">a</span> <span word="minor">minor</span> <span word="constituent">constituent</span> <span word="of">of</span> <span word="the">the</span> <span word="material">material</span>, <span word="extremely">extremely</span> <span word="low">low</span> <span word="in">in</span> <span word="density">density</span>, <span word="that">that</span> <span word="lies">lies</span> <span word="between">between</span> <span word="the">the</span> <span word="stars">stars</span>. <span word="Dust">Dust</span> <span word="accounts">accounts</span> <span word="for">for</span> <span word="about">about</span> <span word="one">one</span> <span word="percent">percent</span> <span word="of">of</span> <span word="the">the</span> <span word="total">total</span> <span word="mass">mass</span> <span word="of">of</span> <span word="interstellar">interstellar</span> <span word="matter">matter</span>. <span word="The">The</span> <span word="rest">rest</span> <span word="is">is</span> <span word="hydrogen">hydrogen</span> <span word="and">and</span> <span word="helium">helium</span> <span word="gas">gas</span>, <span word="with">with</span> <span word="small">small</span> <span word="amounts">amounts</span> <span word="of">of</span> <span word="other">other</span> <span word="elements">elements</span>. <span word="The">The</span> <span word="interstellar">interstellar</span> <span word="material">material</span>, <span word="rather">rather</span> <span word="like">like</span> <span word="terrestrial">terrestrial</span> <span word="clouds">clouds</span>, <span word="comes">comes</span> <span word="in">in</span> <span word="all">all</span> <span word="shapes">shapes</span> <span word="and">and</span> <span word="sizes">sizes</span>. <span word="The">The</span> <span word="average">average</span> <span word="density">density</span> <span word="of">of</span> <span word="interstellar">interstellar</span> <span word="material">material</span> <span word="in">in</span> <span word="the">the</span> <span word="vicinity">vicinity</span> <span word="of">of</span> <span word="our">our</span> <span word="Sun">Sun</span> <span word="is">is</span> 1,000 <span word="to">to</span> 10,000 <span word="times">times</span> <span word="less">less</span> <span word="than">than</span> <span word="the">the</span> <span word="best">best</span> <span word="terrestrial">terrestrial</span> <span word="laboratory">laboratory</span> <span word="vacuum">vacuum</span>. <span word="It">It</span> <span word="is">is</span> <span word="only">only</span> <span word="because">because</span> <span word="of">of</span> <span word="the">the</span> <span word="enormous">enormous</span> <span word="interstellar">interstellar</span> <span word="distances">distances</span> <span word="that">that</span> <span word="so">so</span> <span word="little">little</span> <span word="material">material</span> <span word="per">per</span> <span word="unit">unit</span> <span word="of">of</span> <span word="volume">volume</span> <span word="becomes">becomes</span> <span word="so">so</span> <span word="significant">significant</span>. <span word="Optical">Optical</span> <span word="astronomy">astronomy</span> <span word="is">is</span> <span word="most">most</span> <span word="directly">directly</span> <span word="affected">affected</span>, <span word="for">for</span> <span word="although">although</span> <span word="interstellar">interstellar</span> <span word="gas">gas</span> <span word="is">is</span> <span word="perfectly">perfectly</span> <span word="transparent">transparent</span>, <span word="the">the</span> <span word="dust">dust</span> <span word="is">is</span> <span word="not">not</span>.</p><p> 17. <span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="passage">passage</span>, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="is">is</span> <span word="a">a</span> <span word="direct">direct</span> <span word="perceptual">perceptual</span> <span word="consequence">consequence</span> <span word="of">of</span> <span word="interstellar">interstellar</span> <span word="dust">dust</span>?</p><p> <span word="Some">Some</span> <span word="stars">stars</span> <span word="are">are</span> <span word="rendered">rendered</span> <span word="invisible">invisible</span> <span word="to">to</span> <span word="observers">observers</span> <span word="on">on</span> <span word="Earth">Earth</span>.</p>
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