考研英语阅读五：转基因食物是否安全
<p> <span word="Traditional">Traditional</span> <span word="plant">plant</span> <span word="breeding">breeding</span> <span word="involves">involves</span> <span word="crossing">crossing</span> <span word="varieties">varieties</span> <span word="of">of</span> <span word="the">the</span> <span word="same">same</span> <span word="species">species</span> <span word="in">in</span> <span word="ways">ways</span> <span word="they">they</span> <span word="could">could</span> <span word="cross">cross</span> <span word="naturally">naturally</span>.<span word="For">For</span> <span word="example">example</span>,<span word="disease">disease</span>-<span word="resistant">resistant</span> <span word="varieties">varieties</span> <span word="of">of</span> <span word="wheat">wheat</span> <span word="have">have</span> <span word="been">been</span> <span word="crossed">crossed</span> <span word="with">with</span> <span word="high">high</span>-<span word="yield">yield</span> <span word="wheat">wheat</span> <span word="to">to</span> <span word="combine">combine</span> <span word="these">these</span> <span word="properties">properties</span>.<span word="This">This</span> <span word="type">type</span> <span word="of">of</span> <span word="natural">natural</span> <span word="gene">gene</span> <span word="exchange">exchange</span> <span word="is">is</span> <span word="safe">safe</span> <span word="and">and</span> <span word="fairly">fairly</span> <span word="predictable">predictable</span>.</p><p> <span word="Genetic">Genetic</span> <span word="engineering">engineering</span>(<span word="GE">GE</span>)<span word="involves">involves</span> <span word="exchanging">exchanging</span> <span word="genes">genes</span> <span word="between">between</span> <span word="unrelated">unrelated</span> <span word="species">species</span> <span word="that">that</span> <span word="cannot">cannot</span> <span word="naturally">naturally</span> <span word="exchange">exchange</span> <span word="genes">genes</span> <span word="with">with</span> <span word="each">each</span> <span word="other">other</span>.<span word="GE">GE</span> <span word="can">can</span> <span word="involve">involve</span> <span word="the">the</span> <span word="exchange">exchange</span> <span word="of">of</span> <span word="genes">genes</span> <span word="between">between</span> <span word="vastly">vastly</span> <span word="different">different</span> <span word="species">species</span>, <span word="e">e</span>.<span word="g">g</span>.<span word="putting">putting</span> <span word="scorpion">scorpion</span> <span word="toxin">toxin</span> <span word="genes">genes</span> <span word="into">into</span> <span word="maize">maize</span> <span word="or">or</span> <span word="fish">fish</span> <span word="antifreeze">antifreeze</span> <span word="genes">genes</span> <span word="into">into</span> <span word="tomatoes">tomatoes</span>.<span word="It">It</span> <span word="is">is</span> <span word="possible">possible</span> <span word="that">that</span> <span word="a">a</span> <span word="scorpion">scorpion</span> <span word="toxin">toxin</span> <span word="gene">gene</span>,<span word="even">even</span> <span word="when">when</span> <span word="it">it</span> <span word="is">is</span> <span word="in">in</span> <span word="maize">maize</span> <span word="DNA">DNA</span>,<span word="will">will</span> <span word="still">still</span> <span word="get">get</span> <span word="the">the</span> <span word="organism">organism</span> <span word="to">to</span> <span word="produce">produce</span> <span word="scorpion">scorpion</span> <span word="toxin">toxin</span>, <span word="but">but</span> <span word="what">what</span> <span word="other">other</span> <span word="effects">effects</span> <span word="may">may</span> <span word="it">it</span> <span word="have">have</span> <span word="in">in</span> <span word="this">this</span> <span word="alien">alien</span> <span word="environment">environment</span>?<span word="We">We</span> <span word="are">are</span> <span word="already">already</span> <span word="seeing">seeing</span> <span word="this">this</span> <span word="problemadding">problemadding</span> <span word="human">human</span> <span word="growth">growth</span> <span word="hormone">hormone</span> <span word="genes">genes</span> <span word="to">to</span> <span word="pigs">pigs</span> <span word="certainly">certainly</span> <span word="makes">makes</span> <span word="them">them</span> <span word="growbut">growbut</span> <span word="it">it</span> <span word="also">also</span> <span word="gives">gives</span> <span word="them">them</span> <span word="arthritis">arthritis</span> <span word="and">and</span> <span word="makes">makes</span> <span word="them">them</span> <span word="cross">cross</span>-<span word="eyed">eyed</span>,<span word="which">which</span> <span word="was">was</span> <span word="entirely">entirely</span> <span word="unpredictable">unpredictable</span>.</p><p> <span word="It">It</span> <span word="will">will</span> <span word="be">be</span> <span word="obvious">obvious</span>,<span word="for">for</span> <span word="example">example</span>,<span word="that">that</span> <span word="the">the</span> <span word="gene">gene</span> <span word="for">for</span> <span word="human">human</span> <span word="intelligence">intelligence</span> <span word="will">will</span> <span word="not">not</span> <span word="have">have</span> <span word="the">the</span> <span word="same">same</span> <span word="effect">effect</span> <span word="if">if</span> <span word="inserted">inserted</span> <span word="into">into</span> <span word="cabbage">cabbage</span> <span word="DNA">DNA</span> <span word="as">as</span> <span word="it">it</span> <span word="had">had</span> <span word="in">in</span> <span word="human">human</span> <span word="DNAbut">DNAbut</span> <span word="what">what</span> <span word="side">side</span>-<span word="effect">effect</span> <span word="would">would</span> <span word="it">it</span> <span word="have">have</span>?<span word="In">In</span> <span word="other">other</span> <span word="words">words</span>,<span word="is">is</span> <span word="GE">GE</span> <span word="food">food</span> <span word="safe">safe</span> <span word="to">to</span> <span word="eat">eat</span>?<span word="The">The</span> <span word="answer">answer</span> <span word="is">is</span> <span word="that">that</span> <span word="nobody">nobody</span> <span word="knows">knows</span> <span word="because">because</span> <span word="long">long</span>-<span word="term">term</span> <span word="tests">tests</span> <span word="have">have</span> <span word="not">not</span> <span word="been">been</span> <span word="carried">carried</span> <span word="out">out</span>.</p><p> <span word="Companies">Companies</span> <span word="wanting">wanting</span> <span word="a">a</span> <span word="GE">GE</span> <span word="product">product</span> <span word="approved">approved</span> <span word="in">in</span> <span word="the">the</span> <span word="UK">UK</span> <span word="or">or</span> <span word="USA">USA</span> <span word="are">are</span> <span word="required">required</span> <span word="to">to</span> <span word="provide">provide</span> <span word="regulatory">regulatory</span> <span word="bodies">bodies</span> <span word="with">with</span> <span word="results">results</span> <span word="of">of</span> <span word="their">their</span> <span word="own">own</span> <span word="safety">safety</span> <span word="tests">tests</span>.<span word="Monsantos">Monsantos</span> <span word="soya">soya</span> <span word="beans">beans</span> <span word="were">were</span> <span word="apparently">apparently</span> <span word="fed">fed</span> <span word="to">to</span> <span word="fish">fish</span> <span word="for">for</span> 10 <span word="weeks">weeks</span> <span word="before">before</span> <span word="being">being</span> <span word="approved">approved</span>.<span word="There">There</span> <span word="was">was</span> <span word="no">no</span> <span word="requirement">requirement</span> <span word="for">for</span> <span word="independent">independent</span> <span word="testing">testing</span>,<span word="for">for</span> <span word="long">long</span>-<span word="term">term</span> <span word="testing">testing</span>,<span word="for">for</span> <span word="testing">testing</span> <span word="on">on</span> <span word="humans">humans</span> <span word="or">or</span> <span word="testing">testing</span> <span word="for">for</span> <span word="specific">specific</span> <span word="dangers">dangers</span> <span word="to">to</span> <span word="children">children</span> <span word="or">or</span> <span word="allergic">allergic</span> <span word="people">people</span>.</p>
页:
[1]