英语六级阅读练习：灰尘背后的那些事儿02
<p> <span word="The">The</span> <span word="specific">specific</span> <span word="dust">dust</span> <span word="mix">mix</span> <span word="in">in</span> <span word="any">any</span> <span word="household">household</span> <span word="differs">differs</span> <span word="according">according</span> <span word="to">to</span> <span word="climate">climate</span>, <span word="age">age</span> <span word="of">of</span> <span word="the">the</span> <span word="house">house</span> <span word="and">and</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="people">people</span> <span word="who">who</span> <span word="live">live</span> <span word="in">in</span> <span word="it">it</span> <span word="not">not</span> <span word="to">to</span> <span word="mention">mention</span> <span word="the">the</span> <span word="occupants">occupants</span> <span word="cooking">cooking</span>, <span word="cleaning">cleaning</span> <span word="and">and</span> <span word="smoking">smoking</span> <span word="habits">habits</span>. <span word="But">But</span> <span word="nearly">nearly</span> <span word="everywhere">everywhere</span>, <span word="dust">dust</span> <span word="consists">consists</span> <span word="of">of</span> <span word="some">some</span> <span word="combination">combination</span> <span word="of">of</span> <span word="shed">shed</span> <span word="bits">bits</span> <span word="of">of</span> <span word="human">human</span> <span word="skin">skin</span>, <span word="animal">animal</span> <span word="fur">fur</span>, <span word="decomposing">decomposing</span> <span word="insects">insects</span>, <span word="food">food</span> <span word="debris">debris</span>, <span word="lint">lint</span> <span word="and">and</span> <span word="organic">organic</span> <span word="fibers">fibers</span> <span word="from">from</span> <span word="clothes">clothes</span>, <span word="bedding">bedding</span> <span word="and">and</span> <span word="other">other</span> <span word="fabrics">fabrics</span>, <span word="tracked">tracked</span>-<span word="in">in</span> <span word="soil">soil</span>, <span word="soot">soot</span>, <span word="particulate">particulate</span> <span word="matter">matter</span> <span word="from">from</span> <span word="smoking">smoking</span> <span word="and">and</span> <span word="cooking">cooking</span>, <span word="and">and</span>, <span word="disturbingly">disturbingly</span>, <span word="lead">lead</span>, <span word="arsenic">arsenic</span> <span word="and">and</span> <span word="even">even</span> <span word="DDT">DDT</span>.</p><p> <span word="There">There</span> <span word="are">are</span> <span word="more">more</span> , <span word="Beamer">Beamer</span> <span word="says">says</span>. <span word="Dust">Dust</span> <span word="is">is</span> <span word="a">a</span> <span word="hodgepodge">hodgepodge</span> <span word="of">of</span> <span word="all">all</span> <span word="sorts">sorts</span> <span word="of">of</span> <span word="things">things</span>. <span word="It">It</span> <span word="would">would</span> <span word="probably">probably</span> <span word="be">be</span> <span word="impossible">impossible</span> <span word="to">to</span> <span word="make">make</span> <span word="a">a</span> <span word="list">list</span> <span word="of">of</span> <span word="all">all</span> <span word="the">the</span> <span word="possible">possible</span> <span word="items">items</span>.</p><p> <span word="But">But</span> <span word="dusts">dusts</span> <span word="ingredient">ingredient</span> <span word="label">label</span> <span word="is">is</span> <span word="not">not</span> <span word="the">the</span> <span word="whole">whole</span> <span word="story">story</span>, <span word="since">since</span> <span word="all">all</span> <span word="of">of</span> <span word="those">those</span> <span word="flecks">flecks</span> <span word="and">and</span> <span word="bits">bits</span> <span word="behave">behave</span> <span word="differently">differently</span> <span word="and">and</span> <span word="present">present</span> <span word="different">different</span> <span word="levels">levels</span> <span word="of">of</span> <span word="health">health</span> <span word="risk">risk</span>. <span word="To">To</span> <span word="investigate">investigate</span> <span word="those">those</span> <span word="factors">factors</span> <span word="more">more</span> <span word="closely">closely</span>, <span word="Layton">Layton</span> <span word="and">and</span> <span word="Beamer">Beamer</span> <span word="developed">developed</span> <span word="a">a</span> <span word="computer">computer</span> <span word="algorithm">algorithm</span> <span word="that">that</span> <span word="looked">looked</span> <span word="at">at</span> <span word="the">the</span> <span word="size">size</span>, <span word="source">source</span> <span word="and">and</span> <span word="toxicity">toxicity</span> <span word="of">of</span> <span word="dust">dust</span> <span word="particles">particles</span> <span word="as">as</span> <span word="well">well</span> <span word="as">as</span> <span word="how">how</span> <span word="easily">easily</span> <span word="they">they</span> <span word="enter">enter</span> <span word="the">the</span> <span word="house">house</span>, <span word="if">if</span> <span word="they">they</span> <span word="ever">ever</span> <span word="exit">exit</span> <span word="and">and</span>, <span word="if">if</span> <span word="so">so</span>, <span word="by">by</span> <span word="what">what</span> <span word="route">route</span>. <span word="That">That</span> <span word="information">information</span>, <span word="by">by</span> <span word="extension">extension</span>, <span word="can">can</span> <span word="provide">provide</span> <span word="at">at</span> <span word="least">least</span> <span word="a">a</span> <span word="rough">rough</span> <span word="sense">sense</span> <span word="of">of</span> <span word="the">the</span> <span word="dust">dust</span> <span word="load">load</span> <span word="in">in</span> <span word="your">your</span> <span word="own">own</span> <span word="home">home</span>.</p><p> <span word="As">As</span> <span word="a">a</span> <span word="general">general</span> <span word="rule">rule</span>, <span word="the">the</span> <span word="majority">majority</span> <span word="of">of</span> <span word="household">household</span> <span word="dust">dust</span> <span word="about">about</span> 60% <span word="comes">comes</span> <span word="from">from</span> <span word="outside">outside</span>, <span word="through">through</span> <span word="windows">windows</span>, <span word="doors">doors</span>, <span word="vents">vents</span> <span word="and">and</span>, <span word="significantly">significantly</span>, <span word="on">on</span> <span word="the">the</span> <span word="soles">soles</span> <span word="of">of</span> <span word="your">your</span> <span word="shoes">shoes</span>. <span word="Smaller">Smaller</span> <span word="dust">dust</span> <span word="particles">particles</span> <span word="from">from</span> 28 <span word="to">to</span> 49 <span word="microns">microns</span>, <span word="or">or</span> <span word="thousandths">thousandths</span> <span word="of">of</span> <span word="a">a</span> <span word="millimeter">millimeter</span> <span word="tend">tend</span> <span word="to">to</span> <span word="stay">stay</span> <span word="on">on</span> <span word="your">your</span> <span word="shoes">shoes</span>. <span word="The">The</span> <span word="rest">rest</span> <span word="is">is</span> <span word="shaken">shaken</span> <span word="off">off</span> <span word="inside">inside</span>. <span word="A">A</span> <span word="higher">higher</span> <span word="share">share</span> <span word="of">of</span> <span word="the">the</span> <span word="dust">dust</span> <span word="that">that</span> <span word="floats">floats</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span> <span word="gets">gets</span> <span word="deposited">deposited</span>, <span word="but">but</span> <span word="again">again</span>, <span word="theres">theres</span> <span word="a">a</span> <span word="lot">lot</span> <span word="that">that</span> <span word="determines">determines</span> <span word="how">how</span> <span word="much">much</span> <span word="any">any</span> <span word="one">one</span> <span word="home">home</span> <span word="will">will</span> <span word="get">get</span>.</p>
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