专业英语四级考试阅读理解练习题及答案详解(十四)
<p> <span word="Recent">Recent</span> <span word="research">research</span> <span word="has">has</span> <span word="claimed">claimed</span> <span word="that">that</span> <span word="an">an</span> <span word="excess">excess</span> <span word="of">of</span> <span word="positive">positive</span> <span word="ions">ions</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span> <span word="can">can</span> <span word="have">have</span> <span word="an">an</span> <span word="ill">ill</span> <span word="effect">effect</span> <span word="on">on</span> <span word="peoples">peoples</span> <span word="physical">physical</span> <span word="or">or</span> <span word="psychological">psychological</span> <span word="health">health</span>. <span word="What">What</span> <span word="are">are</span> <span word="positive">positive</span> <span word="ions">ions</span>? <span word="Well">Well</span>, <span word="the">the</span> <span word="air">air</span> <span word="is">is</span> <span word="full">full</span> <span word="of">of</span> <span word="ions">ions</span>, <span word="electrically">electrically</span> <span word="charged">charged</span> <span word="particles">particles</span>, <span word="and">and</span> <span word="generally">generally</span> <span word="there">there</span> <span word="is">is</span> <span word="a">a</span> <span word="rough">rough</span> <span word="balance">balance</span> <span word="between">between</span> <span word="the">the</span> <span word="positive">positive</span> <span word="and">and</span> <span word="the">the</span> <span word="negative">negative</span> <span word="charged">charged</span>. <span word="But">But</span> <span word="sometimes">sometimes</span> <span word="this">this</span> <span word="balance">balance</span> <span word="becomes">becomes</span> <span word="disturbed">disturbed</span> <span word="and">and</span> <span word="a">a</span> <span word="larger">larger</span> <span word="proportion">proportion</span> <span word="of">of</span> <span word="positive">positive</span> <span word="ions">ions</span> <span word="are">are</span> <span word="found">found</span>. <span word="This">This</span> <span word="happens">happens</span> <span word="naturally">naturally</span> <span word="before">before</span> <span word="thunderstorm">thunderstorm</span>, <span word="earthquakes">earthquakes</span> <span word="when">when</span> <span word="winds">winds</span> <span word="such">such</span> <span word="as">as</span> <span word="the">the</span> <span word="Mistral">Mistral</span>, <span word="Hamsin">Hamsin</span> <span word="or">or</span> <span word="Sharav">Sharav</span> <span word="are">are</span> <span word="blowing">blowing</span> <span word="in">in</span> <span word="certain">certain</span> <span word="countries">countries</span>. <span word="Or">Or</span> <span word="it">it</span> <span word="can">can</span> <span word="be">be</span> <span word="caused">caused</span> <span word="by">by</span> <span word="a">a</span> <span word="build">build</span>-<span word="up">up</span> <span word="of">of</span> <span word="static">static</span> <span word="electricity">electricity</span> <span word="indoors">indoors</span> <span word="from">from</span> <span word="carpets">carpets</span> <span word="or">or</span> <span word="clothing">clothing</span> <span word="made">made</span> <span word="of">of</span> <span word="man">man</span>-<span word="made">made</span> <span word="fibres">fibres</span>, <span word="or">or</span> <span word="from">from</span> <span word="TV">TV</span> <span word="sets">sets</span>, <span word="duplicators">duplicators</span> <span word="or">or</span> <span word="computer">computer</span> <span word="display">display</span> <span word="screens">screens</span>.</p><p> <span word="When">When</span> <span word="a">a</span> <span word="large">large</span> <span word="number">number</span> <span word="of">of</span> <span word="positive">positive</span> <span word="ions">ions</span> <span word="are">are</span> <span word="present">present</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span> <span word="many">many</span> <span word="people">people</span> <span word="experience">experience</span> <span word="unpleasant">unpleasant</span> <span word="effects">effects</span> <span word="such">such</span> <span word="as">as</span> <span word="headaches">headaches</span>, <span word="fatigue">fatigue</span>, <span word="irritability">irritability</span>, <span word="and">and</span> <span word="some">some</span> <span word="particularly">particularly</span> <span word="sensitive">sensitive</span> <span word="people">people</span> <span word="suffer">suffer</span> <span word="nausea">nausea</span> <span word="or">or</span> <span word="even">even</span> <span word="mental">mental</span> <span word="disturbance">disturbance</span>. <span word="Animals">Animals</span> <span word="are">are</span> <span word="also">also</span> <span word="affected">affected</span>, <span word="particularly">particularly</span> <span word="before">before</span> <span word="earthquakes">earthquakes</span>, <span word="snakes">snakes</span> <span word="have">have</span> <span word="been">been</span> <span word="observed">observed</span> <span word="to">to</span> <span word="come">come</span> <span word="out">out</span> <span word="of">of</span> <span word="hibernation">hibernation</span>, <span word="rats">rats</span> <span word="to">to</span> <span word="flee">flee</span> <span word="from">from</span> <span word="their">their</span> <span word="burrows">burrows</span>, <span word="dogs">dogs</span> <span word="howl">howl</span> <span word="and">and</span> <span word="cats">cats</span> <span word="jump">jump</span> <span word="about">about</span> <span word="unaccountably">unaccountably</span>. <span word="This">This</span> <span word="has">has</span> <span word="led">led</span> <span word="the">the</span> <span word="US">US</span> <span word="Geographical">Geographical</span> <span word="Survey">Survey</span> <span word="to">to</span> <span word="fund">fund</span> <span word="a">a</span> <span word="network">network</span> <span word="of">of</span> <span word="volunteers">volunteers</span> <span word="to">to</span> <span word="watch">watch</span> <span word="animals">animals</span> <span word="in">in</span> <span word="an">an</span> <span word="effort">effort</span> <span word="to">to</span> <span word="foresee">foresee</span> <span word="such">such</span> <span word="disasters">disasters</span> <span word="before">before</span> <span word="they">they</span> <span word="hit">hit</span> <span word="vulnerable">vulnerable</span> <span word="areas">areas</span> <span word="such">such</span> <span word="as">as</span> <span word="California">California</span>.</p><p> <span word="Conversely">Conversely</span>, <span word="when">when</span> <span word="large">large</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="negative">negative</span> <span word="ions">ions</span> <span word="are">are</span> <span word="present">present</span>, <span word="then">then</span> <span word="people">people</span> <span word="have">have</span> <span word="a">a</span> <span word="feeling">feeling</span> <span word="of">of</span> <span word="well">well</span>-<span word="being">being</span>. <span word="Natural">Natural</span> <span word="conditions">conditions</span> <span word="that">that</span> <span word="produce">produce</span> <span word="these">these</span> <span word="large">large</span> <span word="amounts">amounts</span> <span word="are">are</span> <span word="near">near</span> <span word="the">the</span> <span word="sea">sea</span>, <span word="close">close</span> <span word="to">to</span> <span word="waterfalls">waterfalls</span> <span word="or">or</span> <span word="fountains">fountains</span>, <span word="or">or</span> <span word="in">in</span> <span word="any">any</span> <span word="place">place</span> <span word="where">where</span> <span word="water">water</span> <span word="is">is</span> <span word="sprayed">sprayed</span>, <span word="or">or</span> <span word="forms">forms</span> <span word="a">a</span> <span word="spray">spray</span>. <span word="This">This</span> <span word="probably">probably</span> <span word="accounts">accounts</span> <span word="for">for</span> <span word="the">the</span> <span word="beneficial">beneficial</span> <span word="effect">effect</span> <span word="of">of</span> <span word="a">a</span> <span word="holiday">holiday</span> <span word="by">by</span> <span word="the">the</span> <span word="sea">sea</span>, <span word="or">or</span> <span word="in">in</span> <span word="the">the</span> <span word="mountains">mountains</span> <span word="with">with</span> <span word="tumbling">tumbling</span> <span word="streams">streams</span> <span word="or">or</span> <span word="waterfalls">waterfalls</span>.</p>
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