六级阅读SpeedReading的实战练习四
<p> <span word="Passage">Passage</span> <span word="Four">Four</span></p><p> <span word="Our">Our</span> <span word="galaxy">galaxy</span> <span word="is">is</span> <span word="a">a</span> <span word="gigantic">gigantic</span> <span word="agglomeration">agglomeration</span> <span word="of">of</span> <span word="stars">stars</span> <span word="and">and</span> <span word="planets">planets</span> <span word="whose">whose</span> <span word="numbers">numbers</span> <span word="will">will</span> <span word="probably">probably</span> <span word="never">never</span> <span word="been">been</span> <span word="known">known</span>. <span word="Currently">Currently</span> <span word="we">we</span> <span word="estimate">estimate</span> <span word="this">this</span> <span word="number">number</span> <span word="to">to</span> <span word="be">be</span> <span word="about">about</span> <span word="thirty">thirty</span> <span word="billion">billion</span>. <span word="Scientists">Scientists</span> <span word="have">have</span> <span word="estimated">estimated</span> <span word="that">that</span> <span word="the">the</span> <span word="diameter">diameter</span> <span word="of">of</span> <span word="our">our</span> <span word="galaxy">galaxy</span>, <span word="if">if</span> <span word="it">it</span> <span word="were">were</span> <span word="to">to</span> <span word="be">be</span> <span word="traveled">traveled</span>, <span word="would">would</span> <span word="take">take</span> <span word="us">us</span> <span word="about">about</span> <span word="fifty">fifty</span> <span word="thousand">thousand</span> <span word="light">light</span> <span word="years">years</span> <span word="and">and</span> <span word="the">the</span> <span word="thickness">thickness</span> <span word="to">to</span> <span word="be">be</span> <span word="about">about</span> <span word="fifteen">fifteen</span> <span word="to">to</span> <span word="twenty">twenty</span> <span word="light">light</span> <span word="years">years</span>.</p><p> <span word="We">We</span> <span word="live">live</span> <span word="in">in</span> <span word="small">small</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Way">Way</span> <span word="Galaxy">Galaxy</span>, <span word="which">which</span> <span word="is">is</span> <span word="referred">referred</span> <span word="to">to</span> <span word="as">as</span> <span word="a">a</span> <span word="solar">solar</span> <span word="system">system</span>. <span word="Our">Our</span> <span word="solar">solar</span> <span word="system">system</span> <span word="is">is</span> <span word="made">made</span> <span word="up">up</span> <span word="of">of</span> <span word="nine">nine</span> <span word="planets">planets</span> <span word="and">and</span> 31 <span word="moons">moons</span>, <span word="which">which</span> <span word="orbit">orbit</span> <span word="the">the</span> <span word="center">center</span> <span word="of">of</span> <span word="galaxy">galaxy</span>. <span word="At">At</span> <span word="the">the</span> <span word="center">center</span> <span word="of">of</span> <span word="our">our</span> <span word="galaxy">galaxy</span> <span word="is">is</span> <span word="our">our</span> <span word="Sun">Sun</span>, <span word="which">which</span> <span word="is">is</span> <span word="approximately">approximately</span> <span word="twenty">twenty</span>-<span word="five">five</span> <span word="thousand">thousand</span> <span word="light">light</span> <span word="years">years</span> <span word="from">from</span> <span word="our">our</span> <span word="solar">solar</span> <span word="system">system</span>.</p><p> <span word="These">These</span> <span word="nine">nine</span> <span word="major">major</span> <span word="planets">planets</span> <span word="in">in</span> <span word="order">order</span> <span word="from">from</span> <span word="the">the</span> <span word="center">center</span> <span word="are">are</span> <span word="Mercury">Mercury</span>, <span word="Venus">Venus</span>, <span word="Earth">Earth</span>, <span word="Mars">Mars</span>, <span word="Jupiter">Jupiter</span>, <span word="Saturn">Saturn</span>, <span word="Uranus">Uranus</span>, <span word="Neptune">Neptune</span>, <span word="and">and</span> <span word="Pluto">Pluto</span>.</p><p> <span word="Mercury">Mercury</span> <span word="is">is</span> <span word="the">the</span> <span word="planet">planet</span> <span word="nearest">nearest</span> <span word="to">to</span> <span word="the">the</span> <span word="Sun">Sun</span>. <span word="As">As</span> <span word="it">it</span> <span word="orbits">orbits</span> <span word="the">the</span> <span word="Sun">Sun</span>, <span word="it">it</span> <span word="does">does</span> <span word="not">not</span> <span word="rotate">rotate</span>, <span word="keeping">keeping</span> <span word="the">the</span> <span word="same">same</span> <span word="face">face</span> <span word="of">of</span> <span word="the">the</span> <span word="planet">planet</span> <span word="toward">toward</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="at">at</span> <span word="all">all</span> <span word="times">times</span>. <span word="This">This</span> <span word="means">means</span> <span word="that">that</span> <span word="one">one</span> <span word="side">side</span> <span word="of">of</span> <span word="the">the</span> <span word="planet">planet</span> <span word="has">has</span> <span word="a">a</span> <span word="continual">continual</span> <span word="burning">burning</span> <span word="day">day</span> <span word="of">of</span> 900 <span word="F">F</span>, <span word="and">and</span> <span word="the">the</span> <span word="other">other</span> <span word="side">side</span> <span word="a">a</span> <span word="continual">continual</span> <span word="night">night</span> <span word="and">and</span> <span word="a">a</span> <span word="deadly">deadly</span> <span word="cold">cold</span> <span word="of">of</span> 450 <span word="F">F</span> <span word="below">below</span> <span word="zero">zero</span>. <span word="Mercury">Mercury</span> <span word="is">is</span> <span word="the">the</span> <span word="fastest">fastest</span> <span word="traveling">traveling</span> <span word="of">of</span> <span word="the">the</span> <span word="nine">nine</span> <span word="planets">planets</span> <span word="making">making</span> <span word="one">one</span> <span word="full">full</span> <span word="orbit">orbit</span> <span word="around">around</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="in">in</span> <span word="only">only</span> <span word="eight">eight</span> <span word="days">days</span>. <span word="Life">Life</span> <span word="on">on</span> <span word="mercury">mercury</span> <span word="would">would</span> <span word="be">be</span> <span word="impossible">impossible</span>. <span word="If">If</span> <span word="you">you</span> <span word="could">could</span> <span word="live">live</span> <span word="where">where</span> <span word="the">the</span> <span word="night">night</span> <span word="meets">meets</span> <span word="the">the</span> <span word="day">day</span> <span word="and">and</span> <span word="survive">survive</span> <span word="the">the</span> <span word="extreme">extreme</span> <span word="conditions">conditions</span>, <span word="you">you</span> <span word="would">would</span> <span word="need">need</span> <span word="dark">dark</span> <span word="goggles">goggles</span> <span word="to">to</span> <span word="protect">protect</span> <span word="you">you</span> <span word="eyes">eyes</span> <span word="from">from</span> <span word="the">the</span> <span word="extreme">extreme</span> <span word="light">light</span>. <span word="Mercury">Mercury</span> <span word="has">has</span> <span word="little">little</span> <span word="or">or</span> <span word="no">no</span> <span word="atmosphere">atmosphere</span> <span word="to">to</span> <span word="diffuse">diffuse</span> <span word="the">the</span> <span word="sunlight">sunlight</span>. <span word="You">You</span> <span word="would">would</span> <span word="also">also</span> <span word="weigh">weigh</span> <span word="considerable">considerable</span> <span word="less">less</span> <span word="due">due</span> <span word="to">to</span> <span word="the">the</span> <span word="lack">lack</span> <span word="of">of</span> <span word="gravity">gravity</span>. <span word="A">A</span> <span word="person">person</span> <span word="weighting">weighting</span> 100 <span word="pounds">pounds</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="would">would</span> <span word="weigh">weigh</span> 27 <span word="pounds">pounds</span> <span word="on">on</span> <span word="Mercury">Mercury</span>.</p>
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