Dangers from outer space 来自外星的危险
<p>随身英语 <span word="Dangers">Dangers</span> <span word="from">from</span> <span word="outer">outer</span> <span word="space">space</span> 来自外星的危险 </p><p><span word="Play">Play</span> <span word="audio">audio</span> <span word="file">file</span> 地球已经存在了 46 亿年，在此期间它经受了一些灾难性的事件，比如陨石冲击和气候的巨大改变。那么未来又会是怎样呢？系好安全带，让我们一起探讨那些来自外星际对地球可能会造成的危险。</p><p>课文内容 <span word="Vocabulary">Vocabulary</span>: <span word="Science">Science</span> 词汇: 科学 <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="greatest">greatest</span> <span word="threat">threat</span> <span word="to">to</span> <span word="life">life</span> <span word="on">on</span> <span word="our">our</span> <span word="planet">planet</span>? <span word="Is">Is</span> <span word="it">it</span> <span word="climate">climate</span> <span word="change">change</span>? <span word="Shortages">Shortages</span> <span word="of">of</span> <span word="food">food</span> <span word="or">or</span> <span word="water">water</span>? <span word="Or">Or</span> <span word="might">might</span> <span word="an">an</span> <span word="altogether">altogether</span> <span word="bigger">bigger</span> <span word="danger">danger</span> <span word="come">come</span> <span word="from">from</span> <span word="somewhere">somewhere</span> <span word="further">further</span> <span word="away">away</span>: <span word="space">space</span>?</p><p><span word="We">We</span>’<span word="re">re</span> <span word="not">not</span> <span word="talking">talking</span> <span word="about">about</span> <span word="an">an</span> <span word="invasion">invasion</span> <span word="by">by</span> <span word="little">little</span> <span word="green">green</span> <span word="men">men</span> <span word="here">here</span>. <span word="Instead">Instead</span>, <span word="how">how</span> <span word="about">about</span> <span word="the">the</span> <span word="prospect">prospect</span> <span word="of">of</span> <span word="being">being</span> <span word="hit">hit</span> <span word="by">by</span> <span word="a">a</span> <span word="gigantic">gigantic</span> <span word="meteorite">meteorite</span>, <span word="zapped">zapped</span> <span word="by">by</span> <span word="lethal">lethal</span> <span word="cosmic">cosmic</span> <span word="rays">rays</span> <span word="or">or</span> <span word="fried">fried</span> <span word="by">by</span> <span word="the">the</span> <span word="deadly">deadly</span> <span word="energy">energy</span> <span word="of">of</span> <span word="an">an</span> <span word="erupting">erupting</span> <span word="star">star</span>?</p><p><span word="It">It</span> <span word="wouldn">wouldn</span>’<span word="t">t</span> <span word="be">be</span> <span word="the">the</span> <span word="first">first</span> <span word="time">time</span>. <span word="Good">Good</span> <span word="old">old</span> <span word="planet">planet</span> <span word="Earth">Earth</span> <span word="has">has</span> <span word="had">had</span> <span word="a">a</span> <span word="rough">rough</span> <span word="ride">ride</span> <span word="over">over</span> <span word="the">the</span> <span word="last">last</span> 3.7 <span word="billion">billion</span> <span word="years">years</span>, <span word="with">with</span> <span word="some">some</span> <span word="spectacularly">spectacularly</span> <span word="devastating">devastating</span> <span word="events">events</span>. <span word="The">The</span> <span word="most">most</span> <span word="famous">famous</span> <span word="mass">mass</span> <span word="extinction">extinction</span> <span word="was">was</span> 66 <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>, <span word="when">when</span> <span word="it">it</span>’<span word="s">s</span> <span word="widely">widely</span> <span word="believed">believed</span> <span word="a">a</span> <span word="meteorite">meteorite</span> <span word="killed">killed</span> <span word="off">off</span> <span word="the">the</span> <span word="dinosaurs">dinosaurs</span>. <span word="A">A</span> 110-<span word="mile">mile</span>-<span word="wide">wide</span> <span word="crater">crater</span> <span word="in">in</span> <span word="Mexico">Mexico</span> <span word="with">with</span> <span word="the">the</span> <span word="same">same</span> <span word="geological">geological</span> <span word="age">age</span> <span word="supports">supports</span> <span word="this">this</span> <span word="theory">theory</span>.</p><p><span word="Believe">Believe</span> <span word="it">it</span> <span word="or">or</span> <span word="not">not</span>, <span word="this">this</span> <span word="wasn">wasn</span>’<span word="t">t</span> <span word="the">the</span> <span word="most">most</span> <span word="brutal">brutal</span> <span word="episode">episode</span> <span word="in">in</span> <span word="our">our</span> <span word="planet">planet</span>’<span word="s">s</span> <span word="history">history</span>. <span word="That">That</span> <span word="was">was</span> <span word="when">when</span> <span word="a">a</span> <span word="staggering">staggering</span> 96% <span word="of">of</span> <span word="life">life</span> <span word="was">was</span> <span word="wiped">wiped</span> <span word="out">out</span> <span word="at">at</span> <span word="the">the</span> <span word="end">end</span> <span word="of">of</span> <span word="the">the</span> <span word="Permian">Permian</span> <span word="period">period</span>, 252 <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>. <span word="Scientists">Scientists</span> <span word="don">don</span>’<span word="t">t</span> <span word="know">know</span> <span word="for">for</span> <span word="sure">sure</span> <span word="why">why</span> <span word="this">this</span> <span word="happened">happened</span>, <span word="but">but</span> <span word="any">any</span> <span word="potential">potential</span> <span word="explanations">explanations</span> <span word="carry">carry</span> <span word="with">with</span> <span word="them">them</span> <span word="the">the</span> <span word="grim">grim</span> <span word="possiblity">possiblity</span> <span word="that">that</span> <span word="similar">similar</span> <span word="events">events</span> <span word="could">could</span> <span word="happen">happen</span> <span word="again">again</span>.</p>
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