2012年英语四六级阅读练习灰尘背后的那些事儿
<p> 熟悉四六级阅读理解题型的同学应该都了解，阅读理解材料大多选自《时代》《卫报》《科学美国人》等外刊。要想阅读理解这部分拿到高分，必须在平常多阅读，掌握新词汇，锻炼阅读速度。但对于很多同学来说，如何每日在浩瀚的互联网世界寻找合适的阅读材料进行分析解读是一项很耗时间的事情。为此，考试大英语四六级站点每日精选《卫报》《时代》等外刊上的文章供大家进行阅读练习。 【今日阅读推荐】本篇阅读材料灰尘背后的那些事儿选自《时代》。如果大家觉得比较简单，就当作泛读材料了解了解，认识几个新单词或新表达方式也不错。如果大家觉得这些材料理解上有难度，不妨当做挑战自己的拔高训练，希望大家都有进步^^<span word="Its">Its</span> <span word="hard">hard</span> <span word="to">to</span> <span word="get">get</span> <span word="too">too</span> <span word="worked">worked</span> <span word="up">up</span> <span word="about">about</span> <span word="dust">dust</span>. <span word="Yes">Yes</span>, <span word="its">its</span> <span word="a">a</span> <span word="nuisance">nuisance</span>, <span word="but">but</span> <span word="its">its</span> <span word="hardly">hardly</span> <span word="one">one</span> <span word="that">that</span> <span word="causes">causes</span> <span word="us">us</span> <span word="much">much</span> <span word="anxiety">anxiety</span><span word="and">and</span> <span word="our">our</span> <span word="language">language</span> <span word="itself">itself</span> <span word="suggests">suggests</span> <span word="as">as</span> <span word="much">much</span>. <span word="We">We</span> <span word="call">call</span> <span word="those">those</span> <span word="clumps">clumps</span> <span word="of">of</span> <span word="the">the</span> <span word="stuff">stuff</span> <span word="under">under</span> <span word="the">the</span> <span word="bed">bed</span> <span word="dust">dust</span> <span word="bunnies">bunnies</span> <span word="after">after</span> <span word="all">all</span>, <span word="not">not</span>, <span word="say">say</span>, <span word="dust">dust</span> <span word="vermin">vermin</span>. <span word="to">to</span> <span word="get">get</span> <span word="worked">worked</span> <span word="up">up</span> 为某件事生气;不开心 <span word="clumps">clumps</span> <span word="of">of</span> 一团一团的 <span word="dust">dust</span> <span word="bunny">bunny</span> 积尘;灰兔子 <span word="But">But</span> <span word="theres">theres</span> <span word="a">a</span> <span word="higher">higher</span> <span word="ick">ick</span> <span word="factor">factor</span> <span word="to">to</span> <span word="dust">dust</span> <span word="than">than</span> <span word="you">you</span> <span word="might">might</span> <span word="think">think</span>. <span word="And">And</span> <span word="theres">theres</span> <span word="a">a</span> <span word="science">science</span> <span word="to">to</span> <span word="how">how</span> <span word="it">it</span> <span word="gets">gets</span> <span word="around">around</span><span word="a">a</span> <span word="science">science</span> <span word="that">that</span> <span word="David">David</span> <span word="Layton">Layton</span> <span word="and">and</span> <span word="Paloma">Paloma</span> <span word="Beamer">Beamer</span>, <span word="professors">professors</span> <span word="of">of</span> <span word="environmental">environmental</span> <span word="policy">policy</span> <span word="at">at</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Arizona">Arizona</span>, <span word="are">are</span> <span word="exploring">exploring</span>. <span word="get">get</span> <span word="around">around</span> 传播;散播 <span word="Layton">Layton</span> <span word="and">and</span> <span word="Beamer">Beamer</span>, <span word="whose">whose</span> <span word="latest">latest</span> <span word="study">study</span> <span word="has">has</span> <span word="been">been</span> <span word="accepted">accepted</span> <span word="for">for</span> <span word="fall">fall</span> <span word="publication">publication</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Environmental">Environmental</span> <span word="Science">Science</span> <span word="Technology">Technology</span>, <span word="knew">knew</span> <span word="a">a</span> <span word="lot">lot</span> <span word="about">about</span> <span word="their">their</span> <span word="subject">subject</span> <span word="even">even</span> <span word="before">before</span> <span word="they">they</span> <span word="set">set</span> <span word="to">to</span> <span word="work">work</span>. <span word="Historically">Historically</span>, <span word="everyone">everyone</span> <span word="from">from</span> <span word="chemists">chemists</span> <span word="to">to</span> <span word="homemakers">homemakers</span> <span word="has">has</span> <span word="tried">tried</span> <span word="to">to</span> <span word="figure">figure</span> <span word="out">out</span> <span word="just">just</span> <span word="what">what</span> <span word="dust">dust</span> <span word="is">is</span> <span word="made">made</span> <span word="of">of</span>, <span word="and">and</span> <span word="the">the</span> <span word="Arizona">Arizona</span> <span word="researchers">researchers</span> <span word="drew">drew</span> <span word="their">their</span> <span word="preliminary">preliminary</span> <span word="data">data</span> <span word="mostly">mostly</span> <span word="from">from</span> <span word="two">two</span> <span word="studies">studies</span> <span word="of">of</span> <span word="household">household</span> <span word="dust">dust</span> <span word="conducted">conducted</span> <span word="in">in</span> <span word="the">the</span> <span word="Netherlands">Netherlands</span> <span word="and">and</span> <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="The">The</span> <span word="American">American</span> <span word="survey">survey</span> <span word="in">in</span> <span word="particular">particular</span> <span word="was">was</span> <span word="a">a</span> <span word="big">big</span> <span word="one">one</span>, <span word="covering">covering</span> <span word="six">six</span> <span word="Midwestern">Midwestern</span> <span word="states">states</span>. <span word="Layton">Layton</span> <span word="and">and</span> <span word="Beamer">Beamer</span> <span word="also">also</span> <span word="included">included</span> <span word="a">a</span> <span word="localized">localized</span> <span word="study">study</span> <span word="in">in</span> <span word="Sacramento">Sacramento</span>, <span word="Calif">Calif</span>., <span word="that">that</span> <span word="focused">focused</span> <span word="particularly">particularly</span> <span word="on">on</span> <span word="lead">lead</span> <span word="contamination">contamination</span>. <span word="What">What</span> <span word="all">all</span> <span word="those">those</span> <span word="surveys">surveys</span> <span word="showed">showed</span> <span word="was">was</span> <span word="decidedly">decidedly</span> <span word="unappetizing">unappetizing</span>. <span word="figure">figure</span> <span word="out">out</span> 理解;解决;计算 <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>. <span word="There">There</span> <span word="are">are</span> <span word="more">more</span> [<span word="components">components</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>.<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>. <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>. <span word="Here">Here</span> <span word="in">in</span> <span word="Arizona">Arizona</span>, <span word="says">says</span> <span word="Beamer">Beamer</span>, <span word="where">where</span> <span word="we">we</span> <span word="leave">leave</span> <span word="our">our</span> <span word="windows">windows</span> <span word="open">open</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="year">year</span> <span word="and">and</span> <span word="have">have</span> <span word="an">an</span> <span word="arid">arid</span> <span word="climate">climate</span>, <span word="we">we</span> <span word="would">would</span> <span word="probably">probably</span> <span word="have">have</span> <span word="a">a</span> <span word="higher">higher</span> <span word="ratio">ratio</span>. <span word="Industrial">Industrial</span> <span word="centers">centers</span> <span word="or">or</span> <span word="sooty">sooty</span> <span word="cities">cities</span> <span word="have">have</span> <span word="plenty">plenty</span> <span word="of">of</span> <span word="dust">dust</span> <span word="too">too</span>, <span word="though">though</span> <span word="for">for</span> <span word="different">different</span> <span word="reasons">reasons</span>. <span word="arid">arid</span> <span word="adj">adj</span>. 干旱的;不毛的 <span word="ratio">ratio</span> <span word="n">n</span>. 比例 <span word="Theres">Theres</span> <span word="not">not</span> <span word="much">much</span> <span word="to">to</span> <span word="fret">fret</span> <span word="about">about</span> <span word="in">in</span> <span word="simple">simple</span> <span word="particles">particles</span> <span word="of">of</span> <span word="dirt">dirt</span> <span word="or">or</span> <span word="organic">organic</span> <span word="materials">materials</span> <span word="such">such</span> <span word="as">as</span> <span word="pollen">pollen</span> , <span word="but">but</span> <span word="lead">lead</span>, <span word="arsenic">arsenic</span> <span word="and">and</span> <span word="DDT">DDT</span> <span word="can">can</span> <span word="be">be</span> <span word="a">a</span> <span word="more">more</span> <span word="serious">serious</span> <span word="matter">matter</span>. <span word="About">About</span> <span word="one">one</span>-<span word="third">third</span> <span word="of">of</span> <span word="the">the</span> <span word="arsenic">arsenic</span> <span word="in">in</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span> <span word="comes">comes</span> <span word="from">from</span> <span word="natural">natural</span> <span word="sources">sources</span><span word="volcanoes">volcanoes</span> <span word="principally">principally</span>. <span word="The">The</span> <span word="rest">rest</span> <span word="comes">comes</span> <span word="from">from</span> <span word="mining">mining</span>, <span word="smelting">smelting</span>, <span word="burning">burning</span> <span word="fossil">fossil</span> <span word="fuels">fuels</span> <span word="and">and</span> <span word="other">other</span> <span word="industrial">industrial</span> <span word="processes">processes</span>. <span word="Even">Even</span> <span word="in">in</span> <span word="relatively">relatively</span> <span word="low">low</span> <span word="concentrations">concentrations</span>, <span word="arsenic">arsenic</span> <span word="is">is</span> <span word="not">not</span> <span word="without">without</span> <span word="risk">risk</span>, <span word="especially">especially</span> <span word="to">to</span> <span word="small">small</span> <span word="children">children</span> <span word="who">who</span> <span word="play">play</span> <span word="on">on</span> <span word="the">the</span> <span word="floor">floor</span> <span word="and">and</span> <span word="routinely">routinely</span> <span word="transfer">transfer</span> <span word="things">things</span> <span word="from">from</span> <span word="their">their</span> <span word="hands">hands</span> <span word="to">to</span> <span word="their">their</span> <span word="mouths">mouths</span>. <span word="The">The</span> <span word="same">same</span> <span word="is">is</span> <span word="true">true</span> <span word="for">for</span> <span word="lead">lead</span>, <span word="which">which</span> <span word="comes">comes</span> <span word="less">less</span> <span word="from">from</span> <span word="wall">wall</span> <span word="paint">paint</span><span word="the">the</span> <span word="source">source</span> <span word="most">most</span> <span word="people">people</span> <span word="would">would</span> <span word="expect">expect</span><span word="than">than</span> <span word="from">from</span> <span word="auto">auto</span> <span word="exhaust">exhaust</span>, <span word="smelting">smelting</span> <span word="and">and</span> <span word="soil">soil</span> <span word="deposits">deposits</span>. <span word="Lead">Lead</span> <span word="loading">loading</span> <span word="on">on</span> <span word="floors">floors</span> <span word="is">is</span> <span word="a">a</span> <span word="key">key</span> <span word="determinant">determinant</span> <span word="of">of</span> <span word="blood">blood</span>-<span word="lead">lead</span> <span word="levels">levels</span> <span word="in">in</span> <span word="children">children</span>, <span word="Layton">Layton</span> <span word="and">and</span> <span word="Beamer">Beamer</span> <span word="wrote">wrote</span> <span word="in">in</span> <span word="their">their</span> <span word="paper">paper</span>. <span word="fret">fret</span> <span word="about">about</span> 因焦急;为烦恼 <span word="particle">particle</span> <span word="n">n</span>. 颗粒;微粒 <span word="pollen">pollen</span> <span word="n">n</span>. 花粉 <span word="low">low</span> <span word="concentration">concentration</span> 低浓度 <span word="determinant">determinant</span> <span word="adj">adj</span>. 决定性的 <span word="n">n</span>. 决定因素 <span word="The">The</span> <span word="fact">fact</span> <span word="that">that</span> <span word="DDT">DDT</span> <span word="is">is</span> <span word="still">still</span> <span word="in">in</span> <span word="house">house</span> <span word="dust">dust</span> <span word="is">is</span> <span word="a">a</span> <span word="surprise">surprise</span> <span word="to">to</span> <span word="most">most</span> <span word="people">people</span>, <span word="since">since</span> <span word="the">the</span> <span word="pesticide">pesticide</span> <span word="was">was</span> <span word="banned">banned</span> <span word="in">in</span> <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="in">in</span> 1972. <span word="But">But</span> <span word="a">a</span> <span word="house">house</span> <span word="is">is</span> <span word="a">a</span> <span word="little">little</span> <span word="like">like</span> <span word="a">a</span> <span word="living">living</span> <span word="organism">organism</span>: <span word="once">once</span> <span word="it">it</span> <span word="absorbs">absorbs</span> <span word="a">a</span> <span word="contaminant">contaminant</span>, <span word="it">it</span> <span word="may">may</span> <span word="never">never</span> <span word="purge">purge</span> <span word="it">it</span> <span word="completely">completely</span>. <span word="Dust">Dust</span> <span word="in">in</span> <span word="our">our</span> <span word="homes">homes</span>, <span word="says">says</span> <span word="Beamer">Beamer</span>, <span word="especially">especially</span> <span word="deep">deep</span> <span word="dust">dust</span> <span word="in">in</span> <span word="our">our</span> <span word="carpets">carpets</span> <span word="and">and</span> <span word="furniture">furniture</span>, <span word="is">is</span> <span word="a">a</span> <span word="conglomerate">conglomerate</span> <span word="of">of</span> <span word="substances">substances</span> <span word="over">over</span> <span word="the">the</span> <span word="life">life</span> <span word="of">of</span> <span word="the">the</span> <span word="home">home</span> <span word="and">and</span> <span word="can">can</span> <span word="provide">provide</span> <span word="a">a</span> <span word="historical">historical</span> <span word="record">record</span> <span word="of">of</span> <span word="chemicals">chemicals</span> <span word="that">that</span> <span word="have">have</span> <span word="entered">entered</span> <span word="it">it</span>.<span word="contaminant">contaminant</span> <span word="n">n</span>. 污染物;致污物 <span word="purge">purge</span> <span word="v">v</span>. 净化;清除 <span word="The">The</span> <span word="mess">mess</span> <span word="that">that</span> <span word="originates">originates</span> <span word="within">within</span> <span word="the">the</span> <span word="home">home</span> <span word="is">is</span> <span word="a">a</span> <span word="lot">lot</span> <span word="easier">easier</span> <span word="to">to</span> <span word="measure">measure</span> <span word="and">and</span> <span word="control">control</span>. <span word="The">The</span> <span word="more">more</span> <span word="people">people</span> <span word="who">who</span> <span word="live">live</span> <span word="there">there</span>, <span word="the">the</span> <span word="more">more</span> <span word="skin">skin</span> <span word="thats">thats</span> <span word="going">going</span> <span word="to">to</span> <span word="be">be</span> <span word="shed">shed</span>, <span word="the">the</span> <span word="more">more</span> <span word="pets">pets</span>, <span word="the">the</span> <span word="more">more</span> <span word="animal">animal</span> <span word="fur">fur</span>. <span word="And">And</span>, <span word="as">as</span> <span word="Mom">Mom</span> <span word="always">always</span> <span word="warned">warned</span>, <span word="the">the</span> <span word="more">more</span> <span word="you">you</span> <span word="walk">walk</span> <span word="around">around</span> <span word="the">the</span> <span word="house">house</span> <span word="while">while</span> <span word="eating">eating</span>, <span word="the">the</span> <span word="more">more</span> <span word="food">food</span> <span word="debris">debris</span> <span word="youll">youll</span> <span word="drop">drop</span> <span word="on">on</span> <span word="the">the</span> <span word="floor">floor</span><span word="which">which</span> <span word="also">also</span> <span word="attracts">attracts</span> <span word="more">more</span> <span word="insects">insects</span> <span word="that">that</span> <span word="will">will</span> <span word="die">die</span>, <span word="decompose">decompose</span> <span word="and">and</span> <span word="add">add</span> <span word="their">their</span> <span word="own">own</span> <span word="special">special</span> <span word="zest">zest</span> <span word="to">to</span> <span word="your">your</span> <span word="dust">dust</span>. <span word="Cooking">Cooking</span> <span word="smoke">smoke</span> <span word="and">and</span> <span word="tobacco">tobacco</span> <span word="smoke">smoke</span>, <span word="which">which</span> <span word="are">are</span> <span word="the">the</span> <span word="most">most</span> <span word="obvious">obvious</span> <span word="contributors">contributors</span> <span word="when">when</span> <span word="theyre">theyre</span> <span word="being">being</span> <span word="produced">produced</span>, <span word="actually">actually</span> <span word="make">make</span> <span word="only">only</span> <span word="a">a</span> <span word="small">small</span> <span word="contribution">contribution</span> <span word="to">to</span> <span word="what">what</span> <span word="winds">winds</span> <span word="up">up</span> <span word="on">on</span> <span word="floors">floors</span> <span word="and">and</span> <span word="surfaces">surfaces</span>. <span word="The">The</span> <span word="tiny">tiny</span> <span word="size">size</span> <span word="of">of</span> <span word="the">the</span> <span word="particles">particles</span> <span word="makes">makes</span> <span word="them">them</span> <span word="likelier">likelier</span> <span word="to">to</span> <span word="rise">rise</span> <span word="and">and</span> <span word="adhere">adhere</span> <span word="to">to</span> <span word="other">other</span> <span word="surfaces">surfaces</span> <span word="or">or</span> <span word="simply">simply</span> <span word="remain">remain</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span> <span word="than">than</span> <span word="to">to</span> <span word="settle">settle</span>. <span word="shed">shed</span> <span word="v">v</span>. 散发;流出 <span word="wind">wind</span> <span word="up">up</span> 卷起;扬起 <span word="It">It</span> <span word="goes">goes</span> <span word="without">without</span> <span word="saying">saying</span> <span word="that">that</span> <span word="your">your</span> <span word="home">home</span> <span word="will">will</span> <span word="never">never</span> <span word="be">be</span> <span word="dust">dust</span>-<span word="free">free</span>, <span word="but">but</span> <span word="there">there</span> <span word="are">are</span> <span word="ways">ways</span> <span word="to">to</span> <span word="reduce">reduce</span> <span word="your">your</span> <span word="own">own</span> <span word="dust">dust</span> <span word="loading">loading</span><span word="and">and</span> <span word="its">its</span> <span word="important">important</span> <span word="that">that</span> <span word="you">you</span> <span word="try">try</span>. <span word="Dust">Dust</span> <span word="mites">mites</span>, <span word="which">which</span> <span word="feed">feed</span> <span word="on">on</span> <span word="shed">shed</span> <span word="skin">skin</span>, <span word="produce">produce</span> <span word="allergens">allergens</span> <span word="that">that</span> <span word="are">are</span> <span word="known">known</span> <span word="triggers">triggers</span> <span word="for">for</span> <span word="people">people</span> <span word="suffering">suffering</span> <span word="from">from</span> <span word="asthma">asthma</span>. <span word="Same">Same</span> <span word="goes">goes</span> <span word="for">for</span> <span word="cockroach">cockroach</span> <span word="dust">dust</span>, <span word="especially">especially</span> <span word="in">in</span> <span word="cities">cities</span>. <span word="No">No</span> <span word="one">one</span> <span word="needs">needs</span> <span word="much">much</span> <span word="convincing">convincing</span> <span word="about">about</span> <span word="the">the</span> <span word="wisdom">wisdom</span> <span word="of">of</span> <span word="getting">getting</span> <span word="rid">rid</span> <span word="of">of</span> <span word="arsenic">arsenic</span>, <span word="and">and</span> <span word="the">the</span> <span word="good">good</span> <span word="news">news</span> <span word="is">is</span> <span word="that">that</span> <span word="about">about</span> 80% <span word="of">of</span> <span word="it">it</span> <span word="can">can</span> <span word="be">be</span> <span word="removed">removed</span> <span word="simply">simply</span> <span word="by">by</span> <span word="cleaning">cleaning</span> <span word="floor">floor</span> <span word="dust">dust</span> <span word="regularly">regularly</span>. <span word="it">it</span> <span word="goes">goes</span> <span word="without">without</span> <span word="saying">saying</span> 不言而喻;不消说 <span word="allergen">allergen</span> 过敏原;反应原 <span word="None">None</span> <span word="of">of</span> <span word="this">this</span> <span word="means">means</span> <span word="that">that</span> <span word="dust">dust</span> <span word="poses">poses</span> <span word="a">a</span> <span word="clear">clear</span> <span word="and">and</span> <span word="present">present</span> <span word="danger">danger</span> <span word="or">or</span> <span word="that">that</span> <span word="you">you</span> <span word="need">need</span> <span word="to">to</span> <span word="take">take</span> <span word="any">any</span> <span word="extraordinary">extraordinary</span> <span word="measures">measures</span>. <span word="Just">Just</span> <span word="clean">clean</span> <span word="regularly">regularly</span>, <span word="dont">dont</span> <span word="smoke">smoke</span>, <span word="eat">eat</span> <span word="at">at</span> <span word="the">the</span> <span word="table">table</span><span word="and">and</span> <span word="try">try</span> <span word="not">not</span> <span word="to">to</span> <span word="freak">freak</span> <span word="out">out</span>. <span word="Dust">Dust</span> <span word="bunnies">bunnies</span> <span word="are">are</span> <span word="still">still</span> <span word="only">only</span> <span word="bunnies">bunnies</span>; <span word="you">you</span> <span word="may">may</span> <span word="just">just</span> <span word="want">want</span> <span word="fewer">fewer</span> <span word="of">of</span> <span word="them">them</span>. <span word="freak">freak</span> <span word="out">out</span> 吓坏了;崩溃 <span word="Question">Question</span> <span word="time">time</span>: 1. <span word="How">How</span> <span word="does">does</span> <span word="dust">dust</span> <span word="come">come</span> <span word="into">into</span> <span word="our">our</span> <span word="houses">houses</span>? 2. <span word="Whats">Whats</span> <span word="the">the</span> <span word="key">key</span> <span word="factor">factor</span> <span word="of">of</span> <span word="blood">blood</span>-<span word="lead">lead</span> <span word="levels">levels</span> <span word="in">in</span> <span word="children">children</span> <span word="according">according</span> <span word="to">to</span> <span word="Layton">Layton</span> <span word="and">and</span> <span word="Beamer">Beamer</span> <span word="papaer">papaer</span>? 3. <span word="How">How</span> <span word="to">to</span> <span word="get">get</span> <span word="rid">rid</span> <span word="of">of</span> <span word="the">the</span> <span word="dust">dust</span> <span word="in">in</span> <span word="house">house</span>? 参考答案 1. <span word="Generally">Generally</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="on">on</span> <span word="the">the</span> <span word="soles">soles</span> <span word="ofour">ofour</span> <span word="shoes">shoes</span>. 2. <span word="Lead">Lead</span> <span word="loading">loading</span> <span word="on">on</span> <span word="floors">floors</span>. 3. <span word="Its">Its</span> <span word="important">important</span> <span word="that">that</span> <span word="you">you</span> <span word="try">try</span>, <span word="just">just</span> <span word="clean">clean</span> <span word="regularly">regularly</span>, <span word="dont">dont</span> <span word="smoke">smoke</span>, <span word="eat">eat</span> <span word="at">at</span> <span word="the">the</span> <span word="table">table</span><span word="and">and</span> <span word="try">try</span> <span word="not">not</span> <span word="to">to</span> <span word="freak">freak</span> <span word="out">out</span>. </p>
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