2017届高考英语一轮复习课时知能训练：人教版选修八 Unit 2《Cloning》
<p> 课时知能训练Ⅰ.阅读理解</p><p> (2017·广东潮州月考)<span word="The">The</span> <span word="hole">hole</span> <span word="in">in</span> <span word="the">the</span> <span word="Earth">Earth</span>'<span word="s">s</span> <span word="ozone">ozone</span> <span word="layer">layer</span> (臭氧层)<span word="has">has</span> <span word="until">until</span> <span word="now">now</span> <span word="protected">protected</span> <span word="Antarctica">Antarctica</span> <span word="from">from</span> <span word="the">the</span> <span word="worst">worst</span> <span word="effects">effects</span> <span word="of">of</span> <span word="global">global</span> <span word="warming">warming</span>.<span word="But">But</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="warned">warned</span> <span word="that">that</span> <span word="as">as</span> <span word="the">the</span> <span word="hole">hole</span> <span word="closes">closes</span> <span word="up">up</span> <span word="in">in</span> <span word="the">the</span> <span word="next">next</span> <span word="few">few</span> <span word="decades">decades</span>，<span word="temperatures">temperatures</span> <span word="on">on</span> <span word="the">the</span> <span word="continent">continent</span> <span word="could">could</span> <span word="rise">rise</span> <span word="by">by</span> <span word="around">around</span> 3℃ <span word="on">on</span> <span word="average">average</span>，<span word="with">with</span> <span word="melting">melting</span> <span word="ice">ice</span> <span word="contributing">contributing</span> <span word="to">to</span> <span word="a">a</span> <span word="global">global</span> <span word="sea">sea</span> <span word="level">level</span> <span word="increase">increase</span> <span word="of">of</span> <span word="up">up</span> <span word="to">to</span> 1.4 <span word="metres">metres</span>.</p><p> <span word="In">In</span> <span word="the">the</span> <span word="past">past</span> <span word="decades">decades</span> <span word="the">the</span> <span word="western">western</span> <span word="Antarctic">Antarctic</span> <span word="has">has</span> <span word="seen">seen</span> <span word="rapid">rapid</span> <span word="ice">ice</span> <span word="loss">loss</span> <span word="as">as</span> <span word="the">the</span> <span word="world">world</span> <span word="has">has</span> <span word="warmed">warmed</span>，<span word="but">but</span> <span word="the">the</span> <span word="other">other</span> <span word="parts">parts</span> <span word="of">of</span> <span word="the">the</span> <span word="continent">continent</span> <span word="have">have</span>，<span word="paradoxically">paradoxically</span>，<span word="been">been</span> <span word="cooling">cooling</span>，<span word="resulting">resulting</span> <span word="in">in</span> <span word="a">a</span> 10% <span word="increase">increase</span> <span word="in">in</span> <span word="ice">ice</span> <span word="in">in</span> <span word="the">the</span> <span word="seas">seas</span> <span word="around">around</span> <span word="the">the</span> <span word="region">region</span>.<span word="This">This</span> <span word="is">is</span> <span word="because">because</span> <span word="the">the</span> <span word="hole">hole</span> <span word="in">in</span> <span word="the">the</span> <span word="ozone">ozone</span> <span word="layer">layer</span> <span word="has">has</span> <span word="increased">increased</span> <span word="cold">cold</span> <span word="winds">winds</span> <span word="in">in</span> <span word="Antarctica">Antarctica</span>，<span word="making">making</span> <span word="much">much</span> <span word="of">of</span> <span word="the">the</span> <span word="continent">continent</span> <span word="surface">surface</span> <span word="colder">colder</span> <span word="than">than</span> <span word="usual">usual</span>.</p><p> <span word="But">But</span> <span word="now">now</span> <span word="that">that</span> <span word="the">the</span> <span word="gasses">gasses</span> <span word="that">that</span> <span word="cause">cause</span> <span word="the">the</span> <span word="ozone">ozone</span> <span word="hole">hole</span> <span word="have">have</span> <span word="been">been</span> <span word="banned">banned</span>，<span word="scientists">scientists</span> <span word="expect">expect</span> <span word="the">the</span> <span word="hole">hole</span> <span word="to">to</span> <span word="repair">repair</span> <span word="itself">itself</span> <span word="within">within</span> <span word="the">the</span> <span word="next">next</span> 50 <span word="to">to</span> 60 <span word="years">years</span>.<span word="By">By</span> <span word="then">then</span> <span word="the">the</span> <span word="cooling">cooling</span> <span word="effect">effect</span> <span word="will">will</span> <span word="have">have</span> <span word="faded">faded</span> <span word="out">out</span> <span word="and">and</span> <span word="the">the</span> <span word="Antarctic">Antarctic</span> <span word="will">will</span> <span word="face">face</span> <span word="the">the</span> <span word="full">full</span> <span word="impact">impact</span> <span word="of">of</span> <span word="global">global</span> <span word="warming">warming</span>.<span word="This">This</span> <span word="means">means</span> <span word="an">an</span> <span word="increase">increase</span> <span word="in">in</span> <span word="average">average</span> <span word="air">air</span> <span word="temperatures">temperatures</span> <span word="of">of</span> <span word="around">around</span> 3℃ <span word="and">and</span> <span word="a">a</span> <span word="reduction">reduction</span> <span word="in">in</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="by">by</span> <span word="around">around</span> <span word="a">a</span> <span word="third">third</span>.</p><p> <span word="The">The</span> <span word="biggest">biggest</span> <span word="threat">threat</span> <span word="to">to</span> <span word="the">the</span> <span word="continent">continent</span> <span word="comes">comes</span> <span word="from">from</span> <span word="warming">warming</span> <span word="seas">seas</span>.<span word="Robert">Robert</span> <span word="Johnson">Johnson</span>，<span word="a">a</span> <span word="scientist">scientist</span> <span word="who">who</span> <span word="monitors">monitors</span> <span word="Antarctica">Antarctica</span> <span word="ice">ice</span> <span word="sheets">sheets</span>，<span word="said">said</span>，“<span word="The">The</span> <span word="ice">ice</span> <span word="sheets">sheets</span> <span word="in">in</span> <span word="Antarctica">Antarctica</span> <span word="are">are</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="metres">metres</span> <span word="thick">thick</span>.<span word="But">But</span> <span word="once">once</span> <span word="warm">warm</span> <span word="ocean">ocean</span> <span word="waters">waters</span> <span word="start">start</span> <span word="flowing">flowing</span> <span word="underneath">underneath</span>，<span word="the">the</span> <span word="ice">ice</span> <span word="will">will</span> <span word="begin">begin</span> <span word="thinning">thinning</span> <span word="and">and</span> <span word="could">could</span> <span word="break">break</span> <span word="up">up</span> <span word="very">very</span> <span word="quickly">quickly</span>.” <span word="Thinning">Thinning</span> <span word="ice">ice</span> <span word="sheets">sheets</span> <span word="cause">cause</span> <span word="ice">ice</span> <span word="to">to</span> <span word="break">break</span> <span word="away">away</span> <span word="from">from</span> <span word="the">the</span> <span word="continent">continent</span> <span word="and">and</span> <span word="to">to</span> <span word="melt">melt</span> <span word="even">even</span> <span word="faster">faster</span>.<span word="Escaping">Escaping</span> <span word="ice">ice</span> <span word="from">from</span> <span word="western">western</span> <span word="Antarctica">Antarctica</span> <span word="has">has</span> <span word="already">already</span> <span word="resulted">resulted</span> <span word="in">in</span> <span word="a">a</span> 10% <span word="rise">rise</span> <span word="in">in</span> <span word="global">global</span> <span word="sea">sea</span> <span word="level">level</span> <span word="in">in</span> <span word="recent">recent</span> <span word="decades">decades</span>.</p>
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