英语阅读强化训练：Tornadoesarecoming
<p> <span word="Keep">Keep</span> <span word="your">your</span> <span word="eyes">eyes</span> <span word="on">on</span> <span word="the">the</span> <span word="sky">sky</span> ― <span word="it">it</span> <span word="looks">looks</span> <span word="like">like</span> 2006 <span word="will">will</span> <span word="be">be</span> <span word="a">a</span> <span word="big">big</span> <span word="year">year</span> <span word="for">for</span> <span word="tornadoes">tornadoes</span>. <span word="As">As</span> <span word="of">of</span> <span word="the">the</span> <span word="first">first</span> <span word="week">week</span> <span word="in">in</span> <span word="April">April</span>, <span word="there">there</span> <span word="have">have</span> <span word="already">already</span> <span word="been">been</span> 445 “<span word="twisters">twisters</span>” <span word="in">in</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>. <span word="Last">Last</span> <span word="year">year</span>, <span word="there">there</span> <span word="were">were</span> <span word="only">only</span> 96 <span word="tornadoes">tornadoes</span> <span word="by">by</span> <span word="the">the</span> <span word="beginning">beginning</span> <span word="of">of</span> <span word="April">April</span>. <span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="National">National</span> <span word="Oceanic">Oceanic</span> <span word="and">and</span> <span word="Atmospheric">Atmospheric</span> <span word="Administration">Administration</span> (<span word="NOAA">NOAA</span>), <span word="a">a</span> <span word="government">government</span> <span word="agency">agency</span> <span word="that">that</span> <span word="studies">studies</span> <span word="the">the</span> <span word="environment">environment</span>, <span word="this">this</span> <span word="marks">marks</span> <span word="the">the</span> <span word="most">most</span> <span word="intense">intense</span> <span word="tornado">tornado</span> <span word="activity">activity</span> <span word="in">in</span> <span word="the">the</span> <span word="first">first</span> <span word="three">three</span> <span word="months">months</span> <span word="of">of</span> <span word="any">any</span> <span word="year">year</span> <span word="since">since</span> 1999. <span word="Previous">Previous</span> <span word="years">years</span> <span word="with">with</span> <span word="a">a</span> <span word="busy">busy</span> <span word="start">start</span> <span word="have">have</span> <span word="produced">produced</span> <span word="high">high</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="tornadoes">tornadoes</span> <span word="throughout">throughout</span> <span word="the">the</span> <span word="year">year</span>.</p><p> <span word="For">For</span> <span word="those">those</span> <span word="living">living</span> <span word="in">in</span> “<span word="Tornado">Tornado</span> <span word="Alley">Alley</span>” <span word="from">from</span> <span word="west">west</span> <span word="Texas">Texas</span> <span word="all">all</span> <span word="the">the</span> <span word="way">way</span> <span word="up">up</span> <span word="to">to</span> <span word="North">North</span> <span word="Dakota">Dakota</span>, <span word="springtime">springtime</span> <span word="is">is</span> <span word="tornado">tornado</span> <span word="time">time</span>. <span word="What">What</span> <span word="exactly">exactly</span> <span word="causes">causes</span> <span word="a">a</span> “<span word="twister">twister</span>”? <span word="Tornadoes">Tornadoes</span> <span word="form">form</span> <span word="when">when</span> <span word="moist">moist</span>, <span word="warm">warm</span> <span word="air">air</span> <span word="is">is</span> <span word="caught">caught</span> <span word="under">under</span> <span word="dry">dry</span>, <span word="cool">cool</span> <span word="air">air</span>. <span word="When">When</span> <span word="the">the</span> <span word="warm">warm</span> <span word="air">air</span> <span word="rises">rises</span>, <span word="it">it</span> <span word="upsets">upsets</span> <span word="the">the</span> <span word="cool">cool</span> <span word="air">air</span>, <span word="spinning">spinning</span> (使快速旋转) <span word="the">the</span> <span word="air">air</span> <span word="into">into</span> <span word="a">a</span> <span word="funnel">funnel</span>-<span word="like">like</span> <span word="shape">shape</span>. <span word="The">The</span> <span word="spinning">spinning</span> <span word="air">air</span> <span word="is">is</span> <span word="officially">officially</span> <span word="categorized">categorized</span> <span word="as">as</span> <span word="a">a</span> <span word="tornado">tornado</span> <span word="once">once</span> <span word="it">it</span> <span word="touches">touches</span> <span word="the">the</span> <span word="ground">ground</span>. <span word="These">These</span> <span word="twisters">twisters</span> <span word="can">can</span> <span word="reach">reach</span> <span word="extremely">extremely</span> <span word="high">high</span> <span word="speeds">speeds</span>, <span word="sometimes">sometimes</span> <span word="more">more</span> <span word="than">than</span> 250 <span word="miles">miles</span> <span word="per">per</span> <span word="hour">hour</span>!</p><p> <span word="Scientists">Scientists</span> <span word="try">try</span> <span word="to">to</span> <span word="measure">measure</span> <span word="the">the</span> <span word="speed">speed</span> <span word="and">and</span> <span word="damage">damage</span> <span word="of">of</span> <span word="tornadoes">tornadoes</span> <span word="using">using</span> <span word="what">what</span> <span word="is">is</span> <span word="called">called</span> <span word="the">the</span> <span word="Fujita">Fujita</span> <span word="Scale">Scale</span>, <span word="or">or</span> <span word="F">F</span>-<span word="scale">scale</span>. <span word="The">The</span> <span word="scale">scale</span> <span word="ranges">ranges</span> <span word="from">from</span> <span word="F">F</span>0, <span word="with">with</span> <span word="winds">winds</span> <span word="under">under</span> 73 <span word="mph">mph</span>, <span word="to">to</span> <span word="F">F</span>5, <span word="with">with</span> <span word="winds">winds</span> <span word="between">between</span> 261 <span word="and">and</span> 318 <span word="mph">mph</span>. <span word="Violent">Violent</span> <span word="tornadoes">tornadoes</span> <span word="in">in</span> <span word="the">the</span> <span word="F">F</span>4 <span word="and">and</span> <span word="F">F</span>5 <span word="categories">categories</span> <span word="sometimes">sometimes</span> <span word="last">last</span> <span word="more">more</span> <span word="than">than</span> <span word="an">an</span> <span word="hour">hour</span>, <span word="and">and</span> <span word="cause">cause</span> <span word="incredible">incredible</span> <span word="amounts">amounts</span> <span word="of">of</span> <span word="damage">damage</span>, <span word="often">often</span> <span word="destroying">destroying</span> <span word="everything">everything</span> <span word="for">for</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="miles">miles</span>. <span word="Fortunately">Fortunately</span>, <span word="these">these</span> <span word="account">account</span> <span word="for">for</span> <span word="less">less</span> <span word="than">than</span> 1 <span word="percent">percent</span> <span word="of">of</span> <span word="all">all</span> <span word="tornadoes">tornadoes</span>.</p>
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