职称英语复习资料理工类C级阅读理解精选(2)
<p> <span word="Eta">Eta</span> <span word="Carinae">Carinae</span></p><p> <span word="As">As</span> <span word="possibly">possibly</span> <span word="the">the</span> <span word="galaxys">galaxys</span> <span word="most">most</span> <span word="massive">massive</span> <span word="star">star</span>, <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> <span word="is">is</span> <span word="now">now</span> <span word="engaging">engaging</span> <span word="in">in</span> <span word="some">some</span> <span word="very">very</span> <span word="unusual">unusual</span> <span word="behaviour">behaviour</span>. <span word="Australian">Australian</span> <span word="astronomers">astronomers</span>, <span word="being">being</span> <span word="in">in</span> <span word="the">the</span> <span word="Southern">Southern</span> <span word="Hemisphere">Hemisphere</span> , <span word="are">are</span> <span word="able">able</span> <span word="to">to</span> <span word="observe">observe</span> <span word="it">it</span> <span word="clearly">clearly</span>.</p><p> <span word="In">In</span> <span word="the">the</span> 19<span word="th">th</span> <span word="century">century</span>, <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> <span word="was">was</span> <span word="for">for</span> <span word="a">a</span> <span word="time">time</span> <span word="the">the</span> <span word="third">third</span> <span word="brightest">brightest</span> <span word="star">star</span> <span word="in">in</span> <span word="the">the</span> <span word="sky">sky</span>. <span word="It">It</span> <span word="has">has</span> <span word="now">now</span> <span word="become">become</span> <span word="less">less</span> <span word="bright">bright</span> <span word="so">so</span> <span word="that">that</span> <span word="binoculars">binoculars</span> <span word="are">are</span> <span word="needed">needed</span> <span word="to">to</span> <span word="see">see</span> <span word="it">it</span>. <span word="It">It</span> <span word="seems">seems</span> <span word="to">to</span> <span word="be">be</span> <span word="brightening">brightening</span> <span word="and">and</span> <span word="becoming">becoming</span> <span word="less">less</span> <span word="bright">bright</span> <span word="over">over</span> <span word="a">a</span> <span word="period">period</span> <span word="of">of</span> <span word="many">many</span> <span word="years">years</span>, <span word="said">said</span> <span word="Dr">Dr</span> <span word="Bob">Bob</span> <span word="Duncan">Duncan</span> <span word="from">from</span> <span word="the">the</span> <span word="Australia">Australia</span> <span word="Telescope">Telescope</span> <span word="National">National</span> <span word="Facility">Facility</span>.</p><p> <span word="While">While</span> <span word="it">it</span> <span word="is">is</span> <span word="not">not</span> <span word="unusual">unusual</span> <span word="for">for</span> <span word="stars">stars</span> <span word="to">to</span> <span word="vary">vary</span> <span word="in">in</span> <span word="brightness">brightness</span>, <span word="the">the</span> <span word="period">period</span> <span word="is">is</span> <span word="usually">usually</span> <span word="much">much</span> <span word="shorter">shorter</span>. <span word="Since">Since</span> 1992 <span word="it">it</span> <span word="has">has</span> <span word="become">become</span> <span word="four">four</span> <span word="times">times</span> <span word="brighter">brighter</span>, <span word="and">and</span> <span word="then">then</span> <span word="last">last</span> <span word="year">year</span> <span word="it">it</span> <span word="began">began</span> <span word="to">to</span> <span word="drop">drop</span> <span word="dramatically">dramatically</span>, <span word="he">he</span> <span word="said">said</span>.</p><p> <span word="The">The</span> <span word="problem">problem</span> <span word="in">in</span> <span word="observing">observing</span> <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> <span word="is">is</span> <span word="that">that</span> <span word="it">it</span> <span word="has">has</span> <span word="been">been</span> <span word="surrounded">surrounded</span> <span word="by">by</span> <span word="a">a</span> <span word="cloud">cloud</span> <span word="of">of</span> <span word="gas">gas</span> <span word="and">and</span> <span word="dust">dust</span>, <span word="making">making</span> <span word="it">it</span> <span word="hard">hard</span> <span word="to">to</span> <span word="see">see</span> <span word="the">the</span> <span word="star">star</span> <span word="directly">directly</span>. <span word="However">However</span>, <span word="radio">radio</span> <span word="waves">waves</span> <span word="and">and</span> <span word="infrared">infrared</span> <span word="light">light</span> <span word="can">can</span> <span word="pass">pass</span> <span word="through">through</span> <span word="this">this</span> <span word="cloud">cloud</span>, <span word="so">so</span> <span word="telescopes">telescopes</span> <span word="that">that</span> <span word="receive">receive</span> <span word="these">these</span> <span word="wavelengths">wavelengths</span> <span word="can">can</span> <span word="observe">observe</span> <span word="what">what</span> <span word="is">is</span> <span word="occurring">occurring</span>.</p><p> <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> is of particular interest to astronomers because it seems to be in its death throes(剧痛). Being so large it will end up as a supernova . There has not been a supernova in our galaxy since the invention of the telescope. While a 1987 explosion in a nearby galaxy gave astronomers plenty of valuable data, they are hungry for an even closer look.</p><p> <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> has other unique features, and is the only star known to produce an ultravioletlaser that is brighter than that produced by the Sun. Lasers have been observed in other frequencies from a few stars.</p>
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