2015年职称英语理工类考试完形填空练习(3)
<p> <span word="Dark">Dark</span> <span word="Forces">Forces</span> <span word="Dominate">Dominate</span> <span word="Universe">Universe</span></p><p> <span word="The">The</span> <span word="earth">earth</span>.<span word="moon">moon</span>.<span word="sun">sun</span> <span word="and">and</span> <span word="all">all</span> <span word="visible">visible</span> <span word="stars">stars</span> <span word="in">in</span> <span word="the">the</span> <span word="sky">sky</span> <span word="make">make</span> <span word="up">up</span> <span word="less">less</span> <span word="than">than</span> <span word="one">one</span> <span word="percent">percent</span> <span word="of">of</span> <span word="the">the</span> <span word="universe">universe</span>.<span word="Almost">Almost</span> <span word="all">all</span> <span word="the">the</span> <span word="rest">rest</span> <span word="is">is</span> <span word="dark">dark</span> <span word="matter">matter</span> <span word="and">and</span> <span word="dark">dark</span> <span word="energy">energy</span>，<span word="unknown">unknown</span> <span word="forces">forces</span> <span word="that">that</span> ______<span word="astronomers">astronomers</span>.</p><p> <span word="Observations">Observations</span> <span word="in">in</span> <span word="recent">recent</span> <span word="years">years</span> <span word="have">have</span> <span word="changed">changed</span> <span word="the">the</span> <span word="basic">basic</span>______ <span word="of">of</span> <span word="how">how</span> <span word="the">the</span> <span word="universe">universe</span> <span word="evolved">evolved</span> <span word="and">and</span> <span word="have">have</span> <span word="indicated">indicated</span> <span word="how">how</span> <span word="little">little</span> <span word="is">is</span> <span word="known">known</span> <span word="about">about</span> <span word="the">the</span> <span word="major">major</span> <span word="forces">forces</span> <span word="and">and</span> <span word="substances">substances</span> <span word="that">that</span>______ <span word="our">our</span> <span word="world">world</span> <span word="Astronomers">Astronomers</span> <span word="now">now</span> <span word="know">know</span> <span word="that">that</span> <span word="luminousmatterstars">luminousmatterstars</span>，<span word="planets">planets</span> <span word="and">and</span> <span word="hot">hot</span> <span word="gas">gas</span>----<span word="Accounts">Accounts</span> ______ <span word="only">only</span> <span word="about">about</span> 0,4 <span word="percent">percent</span> <span word="of">of</span> <span word="the">the</span> <span word="universe">universe</span>.<span word="Non">Non</span>-<span word="luminous">luminous</span> <span word="components">components</span>，<span word="such">such</span> <span word="as">as</span> <span word="black">black</span> <span word="holes">holes</span> <span word="and">and</span> <span word="intergalacticgas">intergalacticgas</span>，______ <span word="up">up</span> 3.6 <span word="percent">percent</span> <span word="The">The</span> <span word="rest">rest</span> <span word="is">is</span> <span word="either">either</span> <span word="dark">dark</span> <span word="matter">matter</span> , <span word="about">about</span> 23 <span word="percent">percent</span>，<span word="or">or</span> <span word="dark">dark</span> <span word="energy">energy</span>，<span word="about">about</span> 73 <span word="percent">percent</span>.</p><p> <span word="Dark">Dark</span> <span word="matter">matter</span>.<span word="Sometimes">Sometimes</span> ______ <span word="cold">cold</span> <span word="dark">dark</span> <span word="matter">matter</span>，<span word="has">has</span> <span word="been">been</span> <span word="known">known</span> <span word="for">for</span> <span word="some">some</span> <span word="time">time</span>.<span word="Only">Only</span> <span word="recently">recently</span> <span word="have">have</span> <span word="researchers">researchers</span> <span word="come">come</span> <span word="to">to</span> <span word="understand">understand</span> <span word="the">the</span> <span word="key">key</span> <span word="role">role</span> <span word="it">it</span> ______ <span word="formation">formation</span> <span word="of">of</span> <span word="stars">stars</span>，<span word="planets">planets</span> <span word="and">and</span> <span word="even">even</span> <span word="people">people</span>.</p><p> <span word="We">We</span> ______ <span word="our">our</span> <span word="very">very</span> <span word="existence">existence</span> <span word="to">to</span> <span word="dark">dark</span> <span word="matter">matter</span>, <span word="said">said</span> <span word="physicist">physicist</span> <span word="Paul">Paul</span> <span word="Steinhardt">Steinhardt</span> <span word="and">and</span> <span word="a">a</span> <span word="co">co</span>-<span word="author">author</span> <span word="of">of</span> <span word="a">a</span> <span word="review">review</span> <span word="on">on</span> <span word="dark">dark</span> <span word="matter">matter</span> <span word="which">which</span> ______ <span word="not">not</span> <span word="long">long</span> <span word="ago">ago</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Science">Science</span>.</p><p> <span word="Dark">Dark</span> <span word="matter">matter</span> <span word="dominated">dominated</span> <span word="the">the</span> <span word="structure">structure</span> <span word="in">in</span> <span word="the">the</span> <span word="early">early</span> <span word="universe">universe</span>，<span word="Steinhardt">Steinhardt</span> <span word="said">said</span>。<span word="For">For</span> <span word="the">the</span> <span word="first">first</span> <span word="few">few</span> <span word="billion">billion</span> <span word="years">years</span> <span word="dark">dark</span> <span word="matter">matter</span> <span word="contained">contained</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="mass">mass</span> <span word="of">of</span> <span word="the">the</span> <span word="universe">universe</span> <span word="You">You</span> <span word="can">can</span> <span word="think">think</span> <span word="of">of</span> <span word="ordinary">ordinary</span> <span word="matter">matter</span> <span word="a">a</span> <span word="frothof">frothof</span> <span word="an">an</span> <span word="ocean">ocean</span> <span word="of">of</span> <span word="dark">dark</span> <span word="matter">matter</span>.<span word="The">The</span> <span word="darkmatter">darkmatter</span> <span word="dumpsand">dumpsand</span> <span word="the">the</span> <span word="ordinary">ordinary</span> <span word="matter">matter</span> <span word="falls">falls</span> <span word="into">into</span> <span word="it">it</span>.<span word="That">That</span> <span word="to">to</span> <span word="the">the</span> <span word="formation">formation</span> <span word="of">of</span> <span word="the">the</span> <span word="stars">stars</span> <span word="and">and</span> <span word="galaxies">galaxies</span>.<span word="Without">Without</span> <span word="dark">dark</span> <span word="matter">matter</span> , <span word="there">there</span> <span word="would">would</span> <span word="be">be</span> <span word="virtually">virtually</span> <span word="no">no</span> <span word="structures">structures</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span></p>
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