综合类考试职称英语必备练习题之阅读理解(四)
<p> <span word="Life">Life</span> <span word="in">in</span> <span word="the">the</span> <span word="Universe">Universe</span></p><p> <span word="Many">Many</span> <span word="scientists">scientists</span> <span word="today">today</span> <span word="are">are</span> <span word="convinced">convinced</span> <span word="that">that</span> <span word="life">life</span> <span word="exists">exists</span> <span word="elsewhere">elsewhere</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span>---<span word="life">life</span> <span word="probably">probably</span> <span word="much">much</span> <span word="like">like</span> <span word="that">that</span> <span word="on">on</span> <span word="our">our</span> <span word="own">own</span> <span word="planet">planet</span>. <span word="They">They</span> <span word="reason">reason</span> <span word="in">in</span> <span word="the">the</span> <span word="following">following</span> <span word="way">way</span>.</p><p> <span word="As">As</span> <span word="far">far</span> <span word="as">as</span> <span word="astronomers">astronomers</span> <span word="can">can</span> <span word="determine">determine</span>, <span word="the">the</span> <span word="entire">entire</span> <span word="universe">universe</span> <span word="is">is</span> <span word="built">built</span> <span word="of">of</span> <span word="the">the</span> <span word="same">same</span> <span word="matter">matter</span>. <span word="They">They</span> <span word="have">have</span> <span word="no">no</span> <span word="reason">reason</span> <span word="to">to</span> <span word="doubt">doubt</span> <span word="that">that</span> <span word="matter">matter</span> <span word="obeys">obeys</span> <span word="the">the</span> <span word="same">same</span> <span word="laws">laws</span> <span word="in">in</span> <span word="every">every</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="universe">universe</span>. <span word="Therefore">Therefore</span>, <span word="it">it</span> <span word="is">is</span> <span word="reasonable">reasonable</span> <span word="to">to</span> <span word="guess">guess</span> <span word="that">that</span> <span word="other">other</span> <span word="stars">stars</span>, <span word="with">with</span> <span word="their">their</span> <span word="own">own</span> <span word="planets">planets</span>, <span word="were">were</span> <span word="born">born</span> <span word="in">in</span> <span word="the">the</span> <span word="same">same</span> <span word="way">way</span> <span word="as">as</span> <span word="our">our</span> <span word="own">own</span> <span word="solar">solar</span> <span word="system">system</span>. <span word="What">What</span> <span word="we">we</span> <span word="know">know</span> <span word="of">of</span> <span word="life">life</span> <span word="on">on</span> <span word="earth">earth</span> <span word="suggests">suggests</span> <span word="that">that</span> <span word="life">life</span> <span word="will">will</span> <span word="arise">arise</span> <span word="wherever">wherever</span> <span word="the">the</span> <span word="proper">proper</span> <span word="conditions">conditions</span> <span word="exist">exist</span>.</p><p> <span word="Life">Life</span> <span word="requires">requires</span> <span word="the">the</span> <span word="right">right</span> <span word="amount">amount</span> <span word="and">and</span> <span word="kind">kind</span> <span word="of">of</span> <span word="atmosphere">atmosphere</span>. <span word="This">This</span> <span word="eliminates">eliminates</span> <span word="all">all</span> <span word="those">those</span> <span word="planets">planets</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span> <span word="that">that</span> <span word="are">are</span> <span word="not">not</span> <span word="about">about</span> <span word="the">the</span> <span word="same">same</span> <span word="size">size</span> <span word="and">and</span> <span word="weight">weight</span> <span word="as">as</span> <span word="the">the</span> <span word="earth">earth</span>. <span word="A">A</span> <span word="smaller">smaller</span> <span word="planet">planet</span> <span word="would">would</span> <span word="lose">lose</span> <span word="its">its</span> <span word="atmosphere">atmosphere</span>; <span word="a">a</span> <span word="larger">larger</span> <span word="one">one</span> <span word="would">would</span> <span word="hold">hold</span> <span word="too">too</span> <span word="much">much</span> <span word="of">of</span> <span word="it">it</span>.</p><p> <span word="Life">Life</span> <span word="also">also</span> <span word="requires">requires</span> <span word="a">a</span> <span word="steady">steady</span> <span word="supply">supply</span> <span word="of">of</span> <span word="heat">heat</span> <span word="and">and</span> <span word="light">light</span>. <span word="This">This</span> <span word="eliminates">eliminates</span> <span word="double">double</span> <span word="stars">stars</span>, <span word="or">or</span> <span word="stars">stars</span> <span word="that">that</span> <span word="flare">flare</span> <span word="up">up</span> <span word="suddenly">suddenly</span>. <span word="Only">Only</span> <span word="single">single</span> <span word="stars">stars</span> <span word="that">that</span> <span word="are">are</span> <span word="steady">steady</span> <span word="sources">sources</span> <span word="of">of</span> <span word="heat">heat</span> <span word="and">and</span> <span word="light">light</span> <span word="like">like</span> <span word="our">our</span> <span word="sun">sun</span> <span word="would">would</span> <span word="qualify">qualify</span>.</p><p> <span word="Finally">Finally</span>, <span word="life">life</span> <span word="could">could</span> <span word="evolve">evolve</span> <span word="only">only</span> <span word="if">if</span> <span word="the">the</span> <span word="planet">planet</span> <span word="is">is</span> <span word="just">just</span> <span word="the">the</span> <span word="right">right</span> <span word="distance">distance</span> <span word="from">from</span> <span word="its">its</span> <span word="sun">sun</span>. <span word="With">With</span> <span word="a">a</span> <span word="weaker">weaker</span> <span word="sun">sun</span> <span word="than">than</span> <span word="our">our</span> <span word="own">own</span>, <span word="the">the</span> <span word="planet">planet</span> <span word="would">would</span> <span word="have">have</span> <span word="to">to</span> <span word="be">be</span> <span word="closer">closer</span> <span word="to">to</span> <span word="it">it</span>. <span word="With">With</span> <span word="a">a</span> <span word="stronger">stronger</span> <span word="sun">sun</span>, <span word="it">it</span> <span word="would">would</span> <span word="have">have</span> <span word="to">to</span> <span word="be">be</span> <span word="farther">farther</span> <span word="away">away</span>.</p><p> <span word="If">If</span> <span word="we">we</span> <span word="suppose">suppose</span> <span word="that">that</span> <span word="every">every</span> <span word="star">star</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span> <span word="has">has</span> <span word="a">a</span> <span word="family">family</span> <span word="of">of</span> <span word="planets">planets</span>, <span word="then">then</span> <span word="how">how</span> <span word="many">many</span> <span word="planets">planets</span> <span word="might">might</span> <span word="support">support</span> <span word="life">life</span>? <span word="First">First</span>, <span word="eliminate">eliminate</span> <span word="those">those</span> <span word="stars">stars</span> <span word="that">that</span> <span word="are">are</span> <span word="not">not</span> <span word="like">like</span> <span word="our">our</span> <span word="sun">sun</span>. <span word="Next">Next</span> <span word="eliminate">eliminate</span> <span word="most">most</span> <span word="of">of</span> <span word="their">their</span> <span word="planets">planets</span>; <span word="they">they</span> <span word="are">are</span> <span word="either">either</span> <span word="too">too</span> <span word="far">far</span> <span word="from">from</span> <span word="or">or</span> <span word="too">too</span> <span word="close">close</span> <span word="to">to</span> <span word="their">their</span> <span word="suns">suns</span>. <span word="Then">Then</span> <span word="eliminate">eliminate</span> <span word="all">all</span> <span word="those">those</span> <span word="planets">planets</span> <span word="which">which</span> <span word="are">are</span> <span word="not">not</span> <span word="the">the</span> <span word="same">same</span> <span word="size">size</span> <span word="and">and</span> <span word="weight">weight</span> <span word="as">as</span> <span word="the">the</span> <span word="earth">earth</span>. <span word="Finally">Finally</span>, <span word="remember">remember</span> <span word="that">that</span> <span word="the">the</span> <span word="proper">proper</span> <span word="conditions">conditions</span> <span word="do">do</span> <span word="not">not</span> <span word="necessarily">necessarily</span> <span word="mean">mean</span> <span word="that">that</span> <span word="life">life</span> <span word="actually">actually</span> <span word="does">does</span> <span word="exist">exist</span> <span word="on">on</span> <span word="a">a</span> <span word="planet">planet</span>. <span word="It">It</span> <span word="may">may</span> <span word="not">not</span> <span word="have">have</span> <span word="begun">begun</span> <span word="yet">yet</span>, <span word="or">or</span> <span word="it">it</span> <span word="may">may</span> <span word="have">have</span> <span word="already">already</span> <span word="died">died</span> <span word="out">out</span>. <span word="This">This</span> <span word="process">process</span> <span word="of">of</span> <span word="elimination">elimination</span> <span word="seems">seems</span> <span word="to">to</span> <span word="leave">leave</span> <span word="very">very</span> <span word="few">few</span> <span word="planets">planets</span> <span word="on">on</span> <span word="which">which</span> <span word="earthlike">earthlike</span> <span word="life">life</span> <span word="might">might</span> <span word="be">be</span> <span word="found">found</span>. <span word="However">However</span>, <span word="even">even</span> <span word="if">if</span> <span word="life">life</span> <span word="could">could</span> <span word="exist">exist</span> <span word="on">on</span> <span word="only">only</span> <span word="one">one</span> <span word="planet">planet</span> <span word="in">in</span> <span word="a">a</span> <span word="million">million</span>, <span word="there">there</span> <span word="are">are</span> <span word="so">so</span> <span word="many">many</span> <span word="billions">billions</span> <span word="of">of</span> <span word="planets">planets</span> <span word="that">that</span> <span word="this">this</span> <span word="would">would</span> <span word="still">still</span> <span word="leave">leave</span> <span word="a">a</span> <span word="vast">vast</span> <span word="number">number</span> <span word="on">on</span> <span word="which">which</span> <span word="life">life</span> <span word="could">could</span> <span word="exist">exist</span>.</p>
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