gre考试阅读真题解析(A)
<p> <span word="It">It</span> <span word="is">is</span> <span word="now">now</span> <span word="established">established</span> <span word="that">that</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Way">Way</span> <span word="is">is</span> <span word="far">far</span> <span word="more">more</span> <span word="extended">extended</span> <span word="and">and</span> <span word="of">of</span> <span word="much">much</span> <span word="greater">greater</span> <span word="mass">mass</span> <span word="than">than</span> <span word="was">was</span> <span word="hitherto">hitherto</span> <span word="thought">thought</span>. <span word="However">However</span>, <span word="all">all</span> <span word="that">that</span> <span word="is">is</span> <span word="visible">visible</span> <span word="of">of</span> <span word="the">the</span> <span word="constituents">constituents</span> <span word="of">of</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Ways">Ways</span> <span word="corona">corona</span> , <span word="where">where</span> <span word="much">much</span> <span word="of">of</span> <span word="the">the</span> <span word="galaxys">galaxys</span> <span word="mass">mass</span> <span word="must">must</span> <span word="be">be</span> <span word="located">located</span>, <span word="is">is</span> <span word="a">a</span> <span word="tiny">tiny</span> <span word="fraction">fraction</span> <span word="of">of</span> <span word="the">the</span> <span word="coronas">coronas</span> <span word="mass">mass</span>. <span word="Thus">Thus</span>, <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Ways">Ways</span> <span word="outlying">outlying</span> <span word="matter">matter</span> <span word="must">must</span> <span word="be">be</span> <span word="dark">dark</span>.</p><p> <span word="Why">Why</span>? <span word="Three">Three</span> <span word="facts">facts</span> <span word="are">are</span> <span word="salient">salient</span>. <span word="First">First</span>, <span word="dwarf">dwarf</span> <span word="galaxies">galaxies</span> <span word="and">and</span> <span word="globular">globular</span> <span word="clusters">clusters</span>, <span word="into">into</span> <span word="which">which</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="stars">stars</span> <span word="of">of</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Ways">Ways</span> <span word="corona">corona</span> <span word="are">are</span> <span word="probably">probably</span> <span word="bound">bound</span>, <span word="consist">consist</span> <span word="mainly">mainly</span> <span word="of">of</span> <span word="old">old</span> <span word="stars">stars</span>. <span word="Second">Second</span>, <span word="old">old</span> <span word="stars">stars</span> <span word="are">are</span> <span word="not">not</span> <span word="highly">highly</span> <span word="luminous">luminous</span>. <span word="Third">Third</span>, <span word="no">no</span> <span word="one">one</span> <span word="has">has</span> <span word="detected">detected</span> <span word="in">in</span> <span word="the">the</span> <span word="corona">corona</span> <span word="the">the</span> <span word="clouds">clouds</span> <span word="of">of</span> <span word="gaseous">gaseous</span> <span word="matter">matter</span> <span word="such">such</span> <span word="as">as</span> <span word="hydrogen">hydrogen</span> <span word="and">and</span> <span word="carbon">carbon</span> <span word="monoxide">monoxide</span> <span word="that">that</span> <span word="are">are</span> <span word="characteristic">characteristic</span> <span word="of">of</span> <span word="the">the</span> <span word="bright">bright</span> <span word="parts">parts</span> <span word="of">of</span> <span word="a">a</span> <span word="galaxy">galaxy</span>. <span word="At">At</span> <span word="present">present</span>, <span word="therefore">therefore</span>, <span word="the">the</span> <span word="best">best</span> <span word="explanationthough">explanationthough</span> <span word="still">still</span> <span word="quite">quite</span> <span word="tentativefor">tentativefor</span> <span word="the">the</span> <span word="darkness">darkness</span> <span word="of">of</span> <span word="the">the</span> <span word="corona">corona</span> <span word="is">is</span> <span word="that">that</span> <span word="the">the</span> <span word="corona">corona</span> <span word="is">is</span> <span word="composed">composed</span> <span word="mainly">mainly</span> <span word="of">of</span> <span word="old">old</span>, <span word="burned">burned</span>-<span word="out">out</span> <span word="stars">stars</span>.</p><p> 17. <span word="The">The</span> <span word="passage">passage</span> <span word="as">as</span> <span word="a">a</span> <span word="whole">whole</span> <span word="is">is</span> <span word="primarily">primarily</span> <span word="concerned">concerned</span> <span word="with">with</span></p><p> <span word="analyzing">analyzing</span> <span word="a">a</span> <span word="current">current</span> <span word="debate">debate</span></p><p> <span word="criticizing">criticizing</span> <span word="a">a</span> <span word="well">well</span>-<span word="established">established</span> <span word="theory">theory</span></p><p> <span word="showing">showing</span> <span word="how">how</span> <span word="new">new</span> <span word="facts">facts</span> <span word="support">support</span> <span word="a">a</span> <span word="previously">previously</span> <span word="dismissed">dismissed</span> <span word="hypothesis">hypothesis</span></p><p> <span word="stating">stating</span> <span word="a">a</span> <span word="conclusion">conclusion</span> <span word="and">and</span> <span word="adducing">adducing</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="may">may</span> <span word="justify">justify</span> <span word="it">it</span></p><p> <span word="contrasting">contrasting</span> <span word="two">two</span> <span word="types">types</span> <span word="of">of</span> <span word="phenomena">phenomena</span> <span word="and">and</span> <span word="showing">showing</span> <span word="how">how</span> <span word="they">they</span> <span word="are">are</span> <span word="related">related</span></p><p> 18. <span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="passage">passage</span>, <span word="a">a</span> <span word="bright">bright</span> <span word="part">part</span> <span word="of">of</span> <span word="a">a</span> <span word="galaxy">galaxy</span> <span word="typically">typically</span> <span word="includes">includes</span></p>
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