GRE阅读练习每日一篇(十二)
<p> 编辑点评： <span word="GRE">GRE</span>阅读的方法相信大家已经积累了很多了，本文就为大家提供一些<span word="GRE">GRE</span>阅读的材料，大家来练一练，把平时学到的东西运用到实际中，也多多积累词汇和句子，提高自己的阅读能力。</p><p> 每天做一些标准的<span word="GRE">GRE</span>阅读练习，有助于大家在<span word="GRE">GRE</span>考试的复习过程中不断地进行练习和总结。希望大家在进行<span word="GRE">GRE</span>阅读练习时，充分运用平时所积累的知识，这样才能有效果。</p><p> <span word="The">The</span> <span word="stratospheric">stratospheric</span> <span word="ozone">ozone</span> <span word="layer">layer</span> <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="completely">completely</span> <span word="uniform">uniform</span> <span word="stratum">stratum</span>, <span word="nor">nor</span> <span word="does">does</span> <span word="it">it</span> <span word="occur">occur</span> <span word="at">at</span> <span word="the">the</span> <span word="same">same</span> <span word="altitude">altitude</span> <span word="around">around</span> <span word="the">the</span> <span word="globe">globe</span>. <span word="It">It</span> <span word="lies">lies</span> <span word="closest">closest</span> <span word="to">to</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="over">over</span> <span word="the">the</span> <span word="poles">poles</span> <span word="and">and</span> <span word="rises">rises</span> <span word="to">to</span> <span word="maximum">maximum</span> <span word="altitude">altitude</span> <span word="over">over</span> <span word="the">the</span> <span word="equator">equator</span>. <span word="In">In</span> <span word="the">the</span> <span word="stratosphere">stratosphere</span>, <span word="ozone">ozone</span> <span word="is">is</span> <span word="continuously">continuously</span> <span word="being">being</span> <span word="made">made</span> <span word="and">and</span> <span word="destroyed">destroyed</span> <span word="by">by</span> <span word="natural">natural</span> <span word="processes">processes</span>. <span word="During">During</span> <span word="the">the</span> <span word="day">day</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="breaks">breaks</span> <span word="down">down</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="oxygen">oxygen</span> <span word="molecules">molecules</span> <span word="to">to</span> <span word="single">single</span> <span word="oxygen">oxygen</span> <span word="atoms">atoms</span>, <span word="and">and</span> <span word="these">these</span> <span word="reacting">reacting</span> <span word="with">with</span> <span word="the">the</span> <span word="oxygen">oxygen</span> <span word="molecules">molecules</span> <span word="that">that</span> <span word="have">have</span> <span word="not">not</span> <span word="been">been</span> <span word="dissociated">dissociated</span>, <span word="form">form</span> <span word="ozone">ozone</span>. <span word="However">However</span>, <span word="the">the</span> <span word="sunlight">sunlight</span> <span word="also">also</span> <span word="breaks">breaks</span> <span word="down">down</span> <span word="ozone">ozone</span> <span word="by">by</span> <span word="converting">converting</span> <span word="some">some</span> <span word="of">of</span> <span word="it">it</span> <span word="back">back</span> <span word="to">to</span> <span word="normal">normal</span> <span word="oxygen">oxygen</span>. <span word="In">In</span> <span word="addition">addition</span> <span word="naturally">naturally</span> <span word="occurring">occurring</span> <span word="nitrogen">nitrogen</span> <span word="oxides">oxides</span> <span word="enter">enter</span> <span word="into">into</span> <span word="the">the</span> <span word="cycle">cycle</span> <span word="and">and</span> <span word="speed">speed</span> <span word="the">the</span> <span word="breakdown">breakdown</span> <span word="reactions">reactions</span>. <span word="The">The</span> <span word="amount">amount</span> <span word="of">of</span> <span word="ozone">ozone</span> <span word="present">present</span> <span word="at">at</span> <span word="any">any</span> <span word="one">one</span> <span word="time">time</span> <span word="is">is</span> <span word="the">the</span> <span word="balance">balance</span> <span word="between">between</span> <span word="the">the</span> <span word="processes">processes</span> <span word="that">that</span> <span word="create">create</span> <span word="it">it</span> <span word="and">and</span> <span word="those">those</span> <span word="that">that</span> <span word="destroy">destroy</span> <span word="it">it</span>.</p><p> <span word="Since">Since</span> <span word="the">the</span> <span word="splitting">splitting</span> <span word="of">of</span> <span word="the">the</span> <span word="oxygen">oxygen</span> <span word="molecules">molecules</span> <span word="depends">depends</span> <span word="directly">directly</span> <span word="upon">upon</span> <span word="the">the</span> <span word="intensity">intensity</span> <span word="of">of</span> <span word="solar">solar</span> <span word="radiation">radiation</span>, <span word="the">the</span> <span word="greatest">greatest</span> <span word="rate">rate</span> <span word="of">of</span> <span word="ozone">ozone</span> <span word="production">production</span> <span word="occurs">occurs</span> <span word="over">over</span> <span word="the">the</span> <span word="tropics">tropics</span>. <span word="However">However</span> <span word="ozone">ozone</span> <span word="is">is</span> <span word="also">also</span> <span word="destroyed">destroyed</span> <span word="most">most</span> <span word="rapidly">rapidly</span> <span word="there">there</span>, <span word="and">and</span> <span word="wind">wind</span> <span word="circulation">circulation</span> <span word="patterns">patterns</span> <span word="carry">carry</span> <span word="the">the</span> <span word="ozone">ozone</span>-<span word="enriched">enriched</span> <span word="upper">upper</span> <span word="layers">layers</span> <span word="of">of</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span> <span word="away">away</span> <span word="from">from</span> <span word="the">the</span> <span word="equator">equator</span>. <span word="It">It</span> <span word="turns">turns</span> <span word="out">out</span> <span word="that">that</span> <span word="the">the</span> <span word="largest">largest</span> <span word="total">total</span> <span word="ozone">ozone</span> <span word="amounts">amounts</span> <span word="are">are</span> <span word="found">found</span> <span word="at">at</span> <span word="high">high</span> <span word="latitudes">latitudes</span>. <span word="On">On</span> <span word="a">a</span> <span word="typical">typical</span> <span word="day">day</span> <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="ozone">ozone</span> <span word="over">over</span> <span word="Minnesota">Minnesota</span>, <span word="for">for</span> <span word="example">example</span>, <span word="is">is</span> 30 <span word="percent">percent</span> <span word="greater">greater</span> <span word="than">than</span> <span word="the">the</span> <span word="amount">amount</span> <span word="over">over</span> <span word="Texas">Texas</span>, 900 <span word="miles">miles</span> <span word="farther">farther</span> <span word="south">south</span>. <span word="The">The</span> <span word="density">density</span> <span word="and">and</span> <span word="altitude">altitude</span> <span word="of">of</span> <span word="the">the</span> <span word="ozone">ozone</span> <span word="layer">layer</span> <span word="also">also</span> <span word="change">change</span> <span word="with">with</span> <span word="the">the</span> <span word="seasons">seasons</span>, <span word="the">the</span> <span word="weather">weather</span>, <span word="and">and</span> <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="solar">solar</span> <span word="activity">activity</span>. <span word="Nevertheless">Nevertheless</span>, <span word="at">at</span> <span word="any">any</span> <span word="one">one</span> <span word="place">place</span> <span word="above">above</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="s">s</span> <span word="surface">surface</span>, <span word="the">the</span> <span word="long">long</span>-<span word="term">term</span> <span word="averages">averages</span> <span word="maintained">maintained</span> <span word="by">by</span> <span word="natural">natural</span> <span word="processes">processes</span> <span word="are">are</span> <span word="believed">believed</span> <span word="to">to</span> <span word="be">be</span> <span word="reasonably">reasonably</span> <span word="constant">constant</span>.</p>
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