GRE阅读：Black Holes
<p> 编辑点评： <span word="GRE">GRE</span>阅读的方法相信大家已经积累了很多了，本文就为大家提供一些<span word="GRE">GRE</span>阅读的材料，大家来练一练，把平时学到的东西运用到实际中，也多多积累词汇和句子，提高自己的阅读能力。</p><p> <span word="Astronomers">Astronomers</span> <span word="think">think</span> <span word="the">the</span> <span word="object">object</span> <span word="shown">shown</span> <span word="in">in</span> <span word="this">this</span> <span word="Chandra">Chandra</span> <span word="X">X</span>-<span word="ray">ray</span> <span word="Observatory">Observatory</span> <span word="image">image</span> <span word="may">may</span> <span word="be">be</span> <span word="an">an</span> <span word="elusive">elusive</span> <span word="intermediate">intermediate</span>-<span word="mass">mass</span> <span word="black">black</span> <span word="hole">hole</span>. <span word="Located">Located</span> <span word="about">about</span> 32 <span word="million">million</span> <span word="light">light</span>-<span word="years">years</span> <span word="from">from</span> <span word="Earth">Earth</span> <span word="in">in</span> <span word="the">the</span> <span word="Messier">Messier</span> 74 <span word="galaxy">galaxy</span> , <span word="this">this</span> <span word="object">object</span> <span word="emits">emits</span> <span word="periodic">periodic</span> <span word="bursts">bursts</span> <span word="of">of</span> <span word="x">x</span>-<span word="rays">rays</span> <span word="at">at</span> <span word="a">a</span> <span word="rate">rate</span> <span word="that">that</span> <span word="suggests">suggests</span> <span word="it">it</span> <span word="is">is</span> <span word="much">much</span> <span word="larger">larger</span> <span word="than">than</span> <span word="a">a</span> <span word="stellar">stellar</span>-<span word="mass">mass</span> <span word="black">black</span> <span word="hole">hole</span> <span word="but">but</span> <span word="significantly">significantly</span> <span word="smaller">smaller</span> <span word="than">than</span> <span word="the">the</span> <span word="supermassive">supermassive</span> <span word="black">black</span> <span word="holes">holes</span> <span word="found">found</span> <span word="at">at</span> <span word="the">the</span> <span word="centers">centers</span> <span word="of">of</span> <span word="galaxies">galaxies</span>. <span word="Few">Few</span> <span word="such">such</span> <span word="middling">middling</span> <span word="black">black</span> <span word="holes">holes</span> <span word="have">have</span> <span word="been">been</span> <span word="discovered">discovered</span>, <span word="and">and</span> <span word="scientists">scientists</span> <span word="aren">aren</span> <span word="t">t</span> <span word="sure">sure</span> <span word="how">how</span> <span word="they">they</span> <span word="form">form</span>.</p><p> <span word="Black">Black</span> <span word="holes">holes</span> <span word="are">are</span> <span word="the">the</span> <span word="cold">cold</span> <span word="remnants">remnants</span> <span word="of">of</span> <span word="former">former</span> <span word="stars">stars</span>, <span word="so">so</span> <span word="dense">dense</span> <span word="that">that</span> <span word="no">no</span> <span word="matter">matter</span> <span word="not">not</span> <span word="even">even</span> <span word="light">light</span> <span word="is">is</span> <span word="able">able</span> <span word="to">to</span> <span word="escape">escape</span> <span word="their">their</span> <span word="powerful">powerful</span> <span word="gravitational">gravitational</span> <span word="pull">pull</span>.</p><p> <span word="While">While</span> <span word="most">most</span> <span word="stars">stars</span> <span word="end">end</span> <span word="up">up</span> <span word="as">as</span> <span word="white">white</span> <span word="dwarfs">dwarfs</span> <span word="or">or</span> <span word="neutron">neutron</span> <span word="stars">stars</span>, <span word="black">black</span> <span word="holes">holes</span> <span word="are">are</span> <span word="the">the</span> <span word="last">last</span> <span word="evolutionary">evolutionary</span> <span word="stage">stage</span> <span word="in">in</span> <span word="the">the</span> <span word="lifetimes">lifetimes</span> <span word="of">of</span> <span word="enormous">enormous</span> <span word="stars">stars</span> <span word="that">that</span> <span word="had">had</span> <span word="been">been</span> <span word="at">at</span> <span word="least">least</span> 10 <span word="or">or</span> 15 <span word="times">times</span> <span word="as">as</span> <span word="massive">massive</span> <span word="as">as</span> <span word="our">our</span> <span word="own">own</span> <span word="sun">sun</span>.</p><p> <span word="When">When</span> <span word="giant">giant</span> <span word="stars">stars</span> <span word="reach">reach</span> <span word="the">the</span> <span word="final">final</span> <span word="stages">stages</span> <span word="of">of</span> <span word="their">their</span> <span word="lives">lives</span> <span word="they">they</span> <span word="often">often</span> <span word="detonate">detonate</span> <span word="in">in</span> <span word="cataclysms">cataclysms</span> <span word="known">known</span> <span word="as">as</span> <span word="supernovae">supernovae</span>. <span word="Such">Such</span> <span word="an">an</span> <span word="explosion">explosion</span> <span word="scatters">scatters</span> <span word="most">most</span> <span word="of">of</span> <span word="a">a</span> <span word="star">star</span> <span word="into">into</span> <span word="the">the</span> <span word="void">void</span> <span word="of">of</span> <span word="space">space</span> <span word="but">but</span> <span word="leaves">leaves</span> <span word="behind">behind</span> <span word="a">a</span> <span word="large">large</span> <span word="cold">cold</span> <span word="remnant">remnant</span> <span word="on">on</span> <span word="which">which</span> <span word="fusion">fusion</span> <span word="no">no</span> <span word="longer">longer</span> <span word="takes">takes</span> <span word="place">place</span>.</p><p> </p>
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