职称英语考试理工类完形填空基础练习及答案(5)
<p> <span word="Structure">Structure</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span></p><p> 1 <span word="The">The</span> <span word="temperature">temperature</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="is">is</span> <span word="over">over</span> 5,000 <span word="degrees">degrees</span> <span word="Fahrenheit">Fahrenheit</span> <span word="at">at</span> <span word="the">the</span> <span word="surface">surface</span>, <span word="but">but</span> <span word="it">it</span> <span word="rises">rises</span> <span word="to">to</span> <span word="perhaps">perhaps</span> <span word="more">more</span> <span word="than">than</span> 16 <span word="million">million</span> <span word="degrees">degrees</span> <span word="at">at</span> <span word="the">the</span> <span word="center">center</span>. <span word="The">The</span> <span word="Sun">Sun</span> <span word="is">is</span> <span word="so">so</span> <span word="much">much</span> <span word="hotter">hotter</span> <span word="than">than</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="that">that</span> <span word="matter">matter</span> <span word="can">can</span> <span word="exist">exist</span> <span word="only">only</span> <span word="as">as</span> <span word="a">a</span> <span word="gas">gas</span>, <span word="except">except</span> <span word="at">at</span> <span word="the">the</span> <span word="core">core</span>. <span word="In">In</span> <span word="the">the</span> <span word="core">core</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span>, <span word="the">the</span> <span word="pressures">pressures</span> <span word="are">are</span> <span word="so">so</span> <span word="great">great</span> <span word="against">against</span> <span word="the">the</span> <span word="gases">gases</span> <span word="that">that</span>, <span word="despite">despite</span> <span word="the">the</span> <span word="high">high</span> <span word="temperature">temperature</span>, <span word="there">there</span> <span word="may">may</span> <span word="be">be</span> <span word="a">a</span> <span word="small">small</span> <span word="solid">solid</span> <span word="core">core</span>. <span word="However">However</span>, <span word="no">no</span> <span word="one">one</span> <span word="really">really</span> <span word="knows">knows</span>, <span word="since">since</span> <span word="the">the</span> <span word="center">center</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="can">can</span> <span word="never">never</span> <span word="be">be</span> <span word="directly">directly</span> <span word="observed">observed</span>.</p><p> 2 <span word="Solar">Solar</span> <span word="astronomers">astronomers</span> <span word="do">do</span> <span word="know">know</span> <span word="that">that</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="is">is</span> <span word="divided">divided</span> <span word="into">into</span> <span word="five">five</span> <span word="layers">layers</span> <span word="of">of</span> <span word="zones">zones</span>. <span word="Starting">Starting</span> <span word="at">at</span> <span word="the">the</span> <span word="outside">outside</span> <span word="and">and</span> <span word="going">going</span> <span word="down">down</span> <span word="into">into</span> <span word="the">the</span> <span word="sun">sun</span>, <span word="the">the</span> <span word="zones">zones</span> <span word="are">are</span> <span word="the">the</span> <span word="corona">corona</span>, <span word="chromosphere">chromosphere</span>, <span word="photosphere">photosphere</span>, <span word="convection">convection</span> <span word="zone">zone</span>, <span word="and">and</span> <span word="finally">finally</span> <span word="the">the</span> <span word="core">core</span>. <span word="The">The</span> <span word="first">first</span> <span word="three">three</span> <span word="zones">zones</span> <span word="are">are</span> <span word="regarded">regarded</span> <span word="as">as</span> <span word="the">the</span> <span word="Suns">Suns</span> <span word="atmosphere">atmosphere</span>. <span word="But">But</span> <span word="since">since</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="has">has</span> <span word="no">no</span> <span word="solid">solid</span> <span word="surface">surface</span>, <span word="it">it</span> <span word="is">is</span> <span word="hard">hard</span> <span word="to">to</span> <span word="tell">tell</span> <span word="where">where</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span> <span word="ends">ends</span> <span word="and">and</span> <span word="the">the</span> <span word="main">main</span> <span word="body">body</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="begins">begins</span>.</p><p> 3 <span word="The">The</span> <span word="Suns">Suns</span> <span word="outermost">outermost</span> <span word="layer">layer</span> <span word="begins">begins</span> <span word="about">about</span> <span word="l">l</span>0000 <span word="miles">miles</span> <span word="above">above</span> <span word="the">the</span> <span word="visible">visible</span> <span word="surface">surface</span> <span word="and">and</span> <span word="goes">goes</span> <span word="outward">outward</span> <span word="for">for</span> <span word="millions">millions</span> <span word="of">of</span> <span word="miles">miles</span>. <span word="This">This</span> <span word="is">is</span> <span word="the">the</span> <span word="only">only</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="that">that</span> <span word="can">can</span> <span word="be">be</span> <span word="seen">seen</span> <span word="during">during</span> <span word="an">an</span> <span word="eclipse">eclipse</span> <span word="such">such</span> <span word="as">as</span> <span word="the">the</span> <span word="one">one</span> <span word="in">in</span> <span word="February">February</span> 1979. <span word="At">At</span> <span word="any">any</span> <span word="other">other</span> <span word="time">time</span>, <span word="the">the</span> <span word="corona">corona</span> <span word="can">can</span> <span word="be">be</span> <span word="seen">seen</span> <span word="only">only</span> <span word="when">when</span> <span word="special">special</span> <span word="instruments">instruments</span> <span word="are">are</span> <span word="used">used</span> <span word="on">on</span> <span word="cameras">cameras</span> <span word="and">and</span> <span word="telescopes">telescopes</span> <span word="to">to</span> <span word="shut">shut</span> <span word="out">out</span> <span word="the">the</span> <span word="glare">glare</span> <span word="of">of</span> <span word="the">the</span> <span word="Suns">Suns</span> <span word="rays">rays</span>.</p><p> 4 <span word="The">The</span> <span word="corona">corona</span> <span word="is">is</span> <span word="a">a</span> <span word="brilliant">brilliant</span>, <span word="pearly">pearly</span> <span word="white">white</span>, <span word="filmy">filmy</span> <span word="light">light</span>, <span word="about">about</span> <span word="as">as</span> <span word="bright">bright</span> <span word="as">as</span> <span word="the">the</span> <span word="full">full</span> <span word="Moon">Moon</span>. <span word="Its">Its</span> <span word="beautiful">beautiful</span> <span word="rays">rays</span> <span word="are">are</span> <span word="a">a</span> <span word="sensational">sensational</span> <span word="sight">sight</span> <span word="during">during</span> <span word="an">an</span> <span word="eclipse">eclipse</span>. <span word="The">The</span> <span word="coronas">coronas</span> <span word="rays">rays</span> <span word="flash">flash</span> <span word="out">out</span> <span word="in">in</span> <span word="a">a</span> <span word="brilliant">brilliant</span> <span word="fan">fan</span> <span word="that">that</span> <span word="has">has</span> <span word="wispy">wispy</span> <span word="spider">spider</span>-<span word="like">like</span> <span word="rays">rays</span> <span word="near">near</span> <span word="the">the</span> <span word="Suns">Suns</span> <span word="north">north</span> <span word="and">and</span> <span word="south">south</span> <span word="poles">poles</span>. <span word="The">The</span> <span word="corona">corona</span> <span word="is">is</span> <span word="thickest">thickest</span> <span word="at">at</span> <span word="the">the</span> <span word="Suns">Suns</span> <span word="equator">equator</span>.</p>
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