职称英语理工类C级阅读理解精选练习题(2)
<p> <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> <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>. <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>. <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> <span word="has">has</span> <span word="other">other</span> <span word="unique">unique</span> <span word="features">features</span>, <span word="and">and</span> <span word="is">is</span> <span word="the">the</span> <span word="only">only</span> <span word="star">star</span> <span word="known">known</span> <span word="to">to</span> <span word="produce">produce</span> <span word="an">an</span> <span word="ultravioletlaser">ultravioletlaser</span> <span word="that">that</span> <span word="is">is</span> <span word="brighter">brighter</span> <span word="than">than</span> <span word="that">that</span> <span word="produced">produced</span> <span word="by">by</span> <span word="the">the</span> <span word="Sun">Sun</span>. <span word="Lasers">Lasers</span> <span word="have">have</span> <span word="been">been</span> <span word="observed">observed</span> <span word="in">in</span> <span word="other">other</span> <span word="frequencies">frequencies</span> <span word="from">from</span> <span word="a">a</span> <span word="few">few</span> <span word="stars">stars</span>. <span word="A">A</span>. <span word="some">some</span> <span word="very">very</span> <span word="common">common</span> <span word="behaviour">behaviour</span> <span word="B">B</span>. <span word="some">some</span> <span word="very">very</span> <span word="dull">dull</span> <span word="behaviour">behaviour</span> 32. <span word="The">The</span> <span word="word">word</span> <span word="period">period</span> <span word="in">in</span> <span word="Paragraph">Paragraph</span> 3 <span word="means">means</span> <span word="the">the</span> <span word="length">length</span> <span word="of">of</span> <span word="time">time</span> <span word="B">B</span>. <span word="for">for</span> <span word="which">which</span> <span word="Eta">Eta</span> <span word="carinaes">carinaes</span> <span word="brightening">brightening</span> <span word="lasts">lasts</span>. <span word="D">D</span>. <span word="it">it</span> <span word="takes">takes</span> <span word="the">the</span> <span word="laser">laser</span> <span word="from">from</span> <span word="Eta">Eta</span> <span word="carinae">carinae</span> <span word="to">to</span> <span word="travel">travel</span> <span word="to">to</span> <span word="the">the</span> <span word="earth">earth</span>. <span word="A">A</span>. <span word="it">it</span> <span word="is">is</span> <span word="too">too</span> <span word="far">far</span> <span word="away">away</span>. <span word="B">B</span>. <span word="there">there</span> <span word="is">is</span> <span word="too">too</span> <span word="much">much</span> <span word="dust">dust</span> <span word="and">and</span> <span word="gas">gas</span> <span word="around">around</span> <span word="it">it</span>. 34. <span word="Astronomers">Astronomers</span> <span word="are">are</span> <span word="particularly">particularly</span> <span word="interested">interested</span> <span word="in">in</span> <span word="Eta">Eta</span> <span word="Carinae">Carinae</span> <span word="because">because</span> <span word="C">C</span>. <span word="it">it</span> <span word="exploded">exploded</span> <span word="in">in</span> 1987. <span word="D">D</span>. <span word="it">it</span> <span word="is">is</span> <span word="brighter">brighter</span> <span word="than">than</span> <span word="the">the</span> <span word="sun">sun</span>. <span word="A">A</span>. <span word="It">It</span> <span word="will">will</span> <span word="end">end</span> <span word="up">up</span> <span word="as">as</span> <span word="a">a</span> <span word="supernova">supernova</span>.<span word="mda">mda</span>.<span word="com">com</span> <span word="C">C</span>. <span word="It">It</span> <span word="is">is</span> <span word="the">the</span> <span word="only">only</span> <span word="star">star</span> <span word="that">that</span> <span word="sends">sends</span> <span word="out">out</span> <span word="an">an</span> <span word="ultraviolet">ultraviolet</span> <span word="laser">laser</span>. <span word="Answers">Answers</span>: 31. <span word="D">D</span> 32. <span word="A">A</span> 33. <span word="B">B</span> 34. <span word="A">A</span> 35. <span word="C">C</span></p>
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