2015考研英语阅读转基因树木
<p> <span word="Genetically">Genetically</span> <span word="modified">modified</span> <span word="tree">tree</span></p><p> 转基因树木</p><p> <span word="Into">Into</span> <span word="the">the</span> <span word="wildwood">wildwood</span></p><p> 进军森林</p><p> <span word="A">A</span> <span word="GM">GM</span> <span word="species">species</span> <span word="may">may</span> <span word="soon">soon</span> <span word="be">be</span> <span word="liberated">liberated</span> <span word="deliberately">deliberately</span></p><p> 一种转基因树木不久或将大量种植，但很审慎</p><p> <span word="ONCE">ONCE</span> <span word="upon">upon</span> <span word="a">a</span> <span word="time">time</span>, <span word="according">according</span> <span word="to">to</span> <span word="folklore">folklore</span>, <span word="a">a</span> <span word="squirrel">squirrel</span> <span word="could">could</span> <span word="travel">travel</span> <span word="through">through</span> <span word="America">America</span> <span word="s">s</span> <span word="chestnutforests">chestnutforests</span> <span word="from">from</span> <span word="Maine">Maine</span> <span word="to">to</span> <span word="Florida">Florida</span> <span word="without">without</span> <span word="ever">ever</span> <span word="touching">touching</span> <span word="the">the</span> <span word="ground">ground</span>.</p><p> 民间流传有这样的故事：很久很久以前，松鼠在穿过美国缅因州到福罗里达州的栗树林时，可以一直不触碰地面。</p><p> <span word="The">The</span> <span word="chestnut">chestnut</span> <span word="population">population</span> <span word="of">of</span> <span word="North">North</span> <span word="America">America</span> <span word="was">was</span> <span word="reckoned">reckoned</span> <span word="then">then</span> <span word="to">to</span> <span word="have">have</span> <span word="been">been</span> <span word="about">about</span> 4 <span word="billiontrees">billiontrees</span>. <span word="No">No</span> <span word="longer">longer</span>.</p><p> 估计北美那时的栗树约有40亿棵。现在却不复存在了。</p><p> <span word="Axes">Axes</span> <span word="and">and</span> <span word="chainsaws">chainsaws</span> <span word="must">must</span> <span word="take">take</span> <span word="a">a</span> <span word="share">share</span> <span word="of">of</span> <span word="theblame">theblame</span>.</p><p> 必须说，斧头锯子不乏其罪，</p><p> <span word="But">But</span> <span word="the">the</span> <span word="principal">principal</span> <span word="culprit">culprit</span> <span word="is">is</span> <span word="Cryphonectria">Cryphonectria</span> <span word="parasitica">parasitica</span>, <span word="the">the</span> <span word="fungus">fungus</span> <span word="that">that</span> <span word="causes">causes</span> <span word="chestnut">chestnut</span> <span word="blight">blight</span>.</p><p> 但栗疫病菌才是罪魁祸首，是这种真菌致栗树感染了栗疫病。</p><p> <span word="In">In</span> <span word="the">the</span> <span word="late">late</span> 19<span word="th">th</span> <span word="century">century</span>, <span word="some">some</span> <span word="infected">infected</span> <span word="saplings">saplings</span> <span word="from">from</span> <span word="Asia">Asia</span> <span word="brought">brought</span> <span word="C">C</span>. <span word="parasitica">parasitica</span> <span word="to">to</span> <span word="NorthAmerica">NorthAmerica</span>. <span word="By">By</span> 1950 <span word="the">the</span> <span word="chestnut">chestnut</span> <span word="was">was</span> <span word="little">little</span> <span word="more">more</span> <span word="than">than</span> <span word="a">a</span> <span word="memory">memory</span> <span word="in">in</span> <span word="most">most</span> <span word="parts">parts</span> <span word="of">of</span> <span word="the">the</span> <span word="continent">continent</span>.</p><p> 19世纪后期，一批亚洲来的感染栗疫病菌的树苗把该病菌带到了北美。到了20世纪50年代，北美大陆大部分地区的栗树便全部消失，成为了回忆。</p>
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