六级冲刺练习：阅读（89）
<p> <span word="You">You</span> <span word="have">have</span> <span word="probably">probably</span> <span word="heard">heard</span> <span word="it">it</span> <span word="said">said</span> <span word="that">that</span> <span word="if">if</span> <span word="you">you</span> <span word="put">put</span> <span word="a">a</span> <span word="horsehair">horsehair</span> <span word="in">in</span> <span word="a">a</span> <span word="container">container</span> <span word="of">of</span> <span word="rainwater">rainwater</span> <span word="and">and</span> <span word="place">place</span> <span word="it">it</span> <span word="in">in</span> <span word="the">the</span> <span word="sunshine">sunshine</span>, <span word="a">a</span> <span word="snake">snake</span> <span word="will">will</span> <span word="develop">develop</span>. <span word="It">It</span> <span word="is">is</span> <span word="hard">hard</span> <span word="to">to</span> <span word="convince">convince</span> <span word="people">people</span> <span word="even">even</span> <span word="today">today</span> <span word="that">that</span> <span word="this">this</span> <span word="is">is</span> <span word="not">not</span> <span word="true">true</span>, <span word="yet">yet</span> <span word="it">it</span> <span word="is">is</span> <span word="not">not</span> <span word="difficult">difficult</span> <span word="to">to</span> <span word="get">get</span> <span word="a">a</span> <span word="horsehair">horsehair</span> <span word="and">and</span> <span word="some">some</span> <span word="rainwater">rainwater</span> <span word="to">to</span> <span word="try">try</span> <span word="the">the</span> <span word="experiment">experiment</span>. <span word="Since">Since</span> <span word="very">very</span> <span word="early">early</span> <span word="times">times</span> <span word="men">men</span> <span word="have">have</span> <span word="believed">believed</span> <span word="that">that</span> <span word="living">living</span> <span word="things">things</span> <span word="could">could</span> <span word="come">come</span> <span word="from">from</span> <span word="non">non</span>-<span word="living">living</span> <span word="things">things</span>. <span word="Some">Some</span> <span word="people">people</span> <span word="thought">thought</span> <span word="that">that</span> <span word="frogs">frogs</span> <span word="and">and</span> <span word="toads">toads</span> <span word="developed">developed</span> <span word="from">from</span> <span word="the">the</span> <span word="mud">mud</span> <span word="of">of</span> <span word="ponds">ponds</span>, <span word="rats">rats</span> <span word="from">from</span> <span word="the">the</span> <span word="river">river</span> <span word="Nile">Nile</span>, <span word="and">and</span> <span word="insects">insects</span> <span word="from">from</span> <span word="dew">dew</span> <span word="or">or</span> <span word="from">from</span> <span word="rotting">rotting</span> <span word="waste">waste</span>. <span word="Vergil">Vergil</span> <span word="wrote">wrote</span> <span word="that">that</span> <span word="slime">slime</span> <span word="begat">begat</span> <span word="frogs">frogs</span>. <span word="Centuries">Centuries</span> <span word="later">later</span>, <span word="other">other</span> <span word="men">men</span> <span word="wrote">wrote</span> <span word="that">that</span> <span word="water">water</span> <span word="produced">produced</span> <span word="fishes">fishes</span> <span word="and">and</span> <span word="that">that</span> <span word="mice">mice</span> <span word="came">came</span> <span word="from">from</span> <span word="old">old</span> <span word="rags">rags</span>. <span word="This">This</span> <span word="notion">notion</span> <span word="that">that</span> <span word="living">living</span> <span word="things">things</span> <span word="can">can</span> <span word="come">come</span> <span word="from">from</span> <span word="lifeless">lifeless</span> <span word="matter">matter</span> <span word="is">is</span> <span word="known">known</span> <span word="as">as</span> <span word="the">the</span> <span word="theory">theory</span> <span word="of">of</span> <span word="spontaneous">spontaneous</span> <span word="generation">generation</span>.<span word="Today">Today</span> <span word="we">we</span> <span word="know">know</span> <span word="that">that</span> <span word="living">living</span> <span word="things">things</span> <span word="can">can</span> <span word="come">come</span> <span word="only">only</span> <span word="from">from</span> <span word="living">living</span> <span word="things">things</span>. <span word="Redi">Redi</span>, <span word="in">in</span> <span word="the">the</span> <span word="seventeenth">seventeenth</span> <span word="century">century</span>, <span word="was">was</span> <span word="the">the</span> <span word="first">first</span> <span word="to">to</span> <span word="experiment">experiment</span> <span word="to">to</span> <span word="prove">prove</span> <span word="that">that</span> <span word="insects">insects</span> <span word="do">do</span> <span word="not">not</span> <span word="originate">originate</span> <span word="from">from</span> <span word="rotting">rotting</span> <span word="matter">matter</span>. <span word="From">From</span> <span word="his">his</span> <span word="experiment">experiment</span>, <span word="Redi">Redi</span> <span word="concluded">concluded</span> <span word="that">that</span> <span word="maggots">maggots</span> <span word="appear">appear</span> <span word="in">in</span> <span word="decaying">decaying</span> <span word="meat">meat</span> <span word="simply">simply</span> <span word="because">because</span> <span word="the">the</span> <span word="eggs">eggs</span> <span word="of">of</span> <span word="flies">flies</span> <span word="hatch">hatch</span> <span word="there">there</span>, <span word="and">and</span> <span word="not">not</span> <span word="from">from</span> <span word="spontaneous">spontaneous</span> <span word="generation">generation</span>.</p><p> <span word="At">At</span> <span word="the">the</span> <span word="time">time</span> <span word="of">of</span> <span word="Leeuwenhoek">Leeuwenhoek</span> <span word="the">the</span> <span word="microscope">microscope</span> <span word="was">was</span> <span word="not">not</span> <span word="well">well</span> <span word="developed">developed</span>, <span word="but">but</span> <span word="with">with</span> <span word="it">it</span> <span word="he">he</span> <span word="discovered">discovered</span> <span word="bacteria">bacteria</span>. <span word="The">The</span> <span word="study">study</span> <span word="of">of</span> <span word="these">these</span> <span word="tiny">tiny</span> <span word="forms">forms</span> <span word="of">of</span> <span word="life">life</span> <span word="which">which</span> <span word="looked">looked</span> <span word="like">like</span> <span word="specks">specks</span> <span word="to">to</span> <span word="him">him</span> <span word="was">was</span> <span word="not">not</span> <span word="practical">practical</span> <span word="until">until</span> <span word="more">more</span> <span word="than">than</span> 150 <span word="years">years</span> <span word="later">later</span>, <span word="when">when</span> <span word="microscopes">microscopes</span> <span word="were">were</span> <span word="much">much</span> <span word="improved">improved</span>. <span word="However">However</span>, <span word="the">the</span> <span word="discovery">discovery</span> <span word="led">led</span> <span word="some">some</span> <span word="medical">medical</span> <span word="men">men</span> <span word="at">at</span> <span word="the">the</span> <span word="time">time</span> <span word="to">to</span> <span word="think">think</span> <span word="that">that</span> <span word="contagious">contagious</span> <span word="diseases">diseases</span> <span word="were">were</span> <span word="due">due</span> <span word="to">to</span> <span word="germs">germs</span> <span word="passed">passed</span> <span word="from">from</span> <span word="the">the</span> <span word="sick">sick</span> <span word="to">to</span> <span word="the">the</span> <span word="well">well</span>.</p>
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