大学英语六级考试阅读：背诵美文(6)
<p> <span word="Colds">Colds</span> <span word="and">and</span> <span word="Age">Age</span></p><p> <span word="A">A</span> <span word="critical">critical</span> <span word="factor">factor</span> <span word="that">that</span> <span word="plays">plays</span> <span word="a">a</span> <span word="part">part</span> <span word="in">in</span> <span word="susceptibility">susceptibility</span> <span word="to">to</span> <span word="colds">colds</span> <span word="is">is</span> <span word="age">age</span>. <span word="A">A</span> <span word="study">study</span> <span word="done">done</span> <span word="by">by</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Michigan">Michigan</span> <span word="School">School</span> <span word="of">of</span> <span word="Public">Public</span> <span word="Health">Health</span> <span word="revealed">revealed</span> <span word="particulars">particulars</span> <span word="that">that</span> <span word="seem">seem</span> <span word="to">to</span> <span word="hold">hold</span> <span word="true">true</span> <span word="for">for</span> <span word="the">the</span> <span word="general">general</span> <span word="population">population</span>. <span word="Infants">Infants</span> <span word="are">are</span> <span word="the">the</span> <span word="most">most</span> <span word="cold">cold</span> <span word="ridden">ridden</span> <span word="group">group</span>, <span word="averaging">averaging</span> <span word="more">more</span> <span word="than">than</span> <span word="six">six</span> <span word="colds">colds</span> <span word="in">in</span> <span word="their">their</span> <span word="first">first</span> <span word="years">years</span>. <span word="Boys">Boys</span> <span word="have">have</span> <span word="more">more</span> <span word="colds">colds</span> <span word="than">than</span> <span word="girls">girls</span> <span word="up">up</span> <span word="to">to</span> <span word="age">age</span> <span word="three">three</span>. <span word="After">After</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> <span word="three">three</span>, <span word="girls">girls</span> <span word="are">are</span> <span word="more">more</span> <span word="susceptible">susceptible</span> <span word="than">than</span> <span word="boys">boys</span>, <span word="and">and</span> <span word="teenage">teenage</span> <span word="girls">girls</span> <span word="average">average</span> <span word="three">three</span> <span word="colds">colds</span> <span word="a">a</span> <span word="year">year</span> <span word="to">to</span> <span word="boys">boys</span> <span word="two">two</span>. <span word="The">The</span> <span word="general">general</span> <span word="incidence">incidence</span> <span word="of">of</span> <span word="colds">colds</span> <span word="continues">continues</span> <span word="to">to</span> <span word="decline">decline</span> <span word="into">into</span> <span word="maturity">maturity</span>. <span word="Elderly">Elderly</span> <span word="people">people</span> <span word="who">who</span> <span word="are">are</span> <span word="in">in</span> <span word="good">good</span> <span word="health">health</span> <span word="have">have</span> <span word="as">as</span> <span word="few">few</span> <span word="as">as</span> <span word="one">one</span> <span word="or">or</span> <span word="two">two</span> <span word="colds">colds</span> <span word="annually">annually</span>. <span word="One">One</span> <span word="exception">exception</span> <span word="is">is</span> <span word="found">found</span> <span word="among">among</span> <span word="people">people</span> <span word="in">in</span> <span word="their">their</span> <span word="twenties">twenties</span>, <span word="especially">especially</span> <span word="women">women</span>, <span word="who">who</span> <span word="show">show</span> <span word="a">a</span> <span word="rise">rise</span> <span word="in">in</span> <span word="cold">cold</span> <span word="infections">infections</span>, <span word="because">because</span> <span word="people">people</span> <span word="in">in</span> <span word="this">this</span> <span word="age">age</span> <span word="group">group</span> <span word="are">are</span> <span word="most">most</span> <span word="likely">likely</span> <span word="to">to</span> <span word="have">have</span> <span word="young">young</span> <span word="children">children</span>. <span word="Adults">Adults</span> <span word="who">who</span> <span word="delay">delay</span> <span word="having">having</span> <span word="children">children</span> <span word="until">until</span> <span word="their">their</span> <span word="thirties">thirties</span> <span word="and">and</span> <span word="forties">forties</span> <span word="experience">experience</span> <span word="the">the</span> <span word="same">same</span> <span word="sudden">sudden</span> <span word="increase">increase</span> <span word="in">in</span> <span word="cold">cold</span> <span word="infections">infections</span>. <span word="The">The</span> <span word="study">study</span> <span word="also">also</span> <span word="found">found</span> <span word="that">that</span> <span word="economics">economics</span> <span word="plays">plays</span> <span word="an">an</span> <span word="important">important</span> <span word="role">role</span>. <span word="As">As</span> <span word="income">income</span> <span word="increases">increases</span>, <span word="the">the</span> <span word="frequency">frequency</span> <span word="at">at</span> <span word="which">which</span> <span word="colds">colds</span> <span word="are">are</span> <span word="reported">reported</span> <span word="in">in</span> <span word="the">the</span> <span word="family">family</span> <span word="decreases">decreases</span>. <span word="Families">Families</span> <span word="with">with</span> <span word="the">the</span> <span word="lowest">lowest</span> <span word="income">income</span> <span word="suffer">suffer</span> <span word="about">about</span> <span word="a">a</span> <span word="third">third</span> <span word="more">more</span> <span word="colds">colds</span> <span word="than">than</span> <span word="families">families</span> <span word="at">at</span> <span word="the">the</span> <span word="upper">upper</span> <span word="end">end</span>. <span word="Lower">Lower</span> <span word="income">income</span> <span word="generally">generally</span> <span word="forces">forces</span> <span word="people">people</span> <span word="to">to</span> <span word="live">live</span> <span word="in">in</span> <span word="more">more</span> <span word="cramped">cramped</span> <span word="quarters">quarters</span> <span word="than">than</span> <span word="those">those</span> <span word="typically">typically</span> <span word="occupied">occupied</span> <span word="by">by</span> <span word="wealthier">wealthier</span> <span word="people">people</span>, <span word="and">and</span> <span word="crowding">crowding</span> <span word="increases">increases</span> <span word="the">the</span> <span word="opportunities">opportunities</span> <span word="for">for</span> <span word="the">the</span> <span word="cold">cold</span> <span word="virus">virus</span> <span word="to">to</span> <span word="travel">travel</span> <span word="from">from</span> <span word="person">person</span> <span word="to">to</span> <span word="person">person</span>. <span word="Low">Low</span> <span word="income">income</span> <span word="may">may</span> <span word="also">also</span> <span word="adversely">adversely</span> <span word="influence">influence</span> <span word="diet">diet</span>. <span word="The">The</span> <span word="degree">degree</span> <span word="to">to</span> <span word="which">which</span> <span word="poor">poor</span> <span word="nutrition">nutrition</span> <span word="affects">affects</span> <span word="susceptibility">susceptibility</span> <span word="to">to</span> <span word="colds">colds</span> <span word="is">is</span> <span word="not">not</span> <span word="yet">yet</span> <span word="clearly">clearly</span> <span word="established">established</span>, <span word="but">but</span> <span word="an">an</span> <span word="inadequate">inadequate</span> <span word="diet">diet</span> <span word="is">is</span> <span word="suspected">suspected</span> <span word="of">of</span> <span word="lowering">lowering</span> <span word="resistance">resistance</span> <span word="generally">generally</span>.</p>
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