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四级阅读精选练习：食用转基因食品安全吗.docx

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四级阅读精选练习：食用转基因食品安全吗Traditionalplantbreedinginvolvescrossingvarietiesofthesamespeciesinwaystheycouldcrossnaturally.Forexample,disease-resistantvarietiesofwheathavebeencrossedwithhigh-yieldwheattocombinetheseproperties.Thistypeofnaturalgeneexchangeissafeandfairlypredictable.Geneticengineering(GE)involvesexchanginggenesbetweenunrelatedspeciesthatcannotnaturallyexchangegeneswitheachother.GEcaninvolvetheexchangeofgenesbetweenvastlydifferentspecies—e.g.puttingscorpiontoxingenesintomaizeorfishantifreezegenesintotomatoes.Itispossiblethatascorpiontoxingene,evenwhenitisinmaizeDNA1,willstillgettheorganismtoproducescorpiontoxin—butwhatothereffectsmayithaveinthisalienenvironment?Wearealreadyseeingthisproblem—addinghumangrowthhormonegenestopigscertainlymakesthemgrow—butitalsogivesthemarthritisandmakesthemcross-eyed,whichwasentirelyunpredictable.Itwillbeobvious,forexample,thatthegeneforhumanintelligencewillnothavethesameeffectifinsertedintocabbageDNAasithadinhumanDNA—butwhatside-effectwouldithave?Inotherwords,isGMfood2safetoeat?Theansweristhatnobodyknowsbecauselong-termtestshavenotbeencarriedout.CompanieswantingaGMproductapprovedintheUKorUSAarerequiredtoprovideregulatorybodieswithresultsoftheirownsafetytests.Monsanto’s3soyabeanswereapparentlyfedtofishfor10weeksbeforebeingapproved.Therewasnorequirementforindependenttesting,forlong-termtesting,fortestingonhumansortestingforspecificdangerstochildrenorallergic4people.ThecurrentpositionoftheUKGovernmentisthat“Thereisnoevidenceoflong-termdangersfromGMfoods.”IntheUS,theAmericanFoodandDrugAdministration5iscurrentlybeingprosecutedforcoveringupresearchthatsuggestedpossiblerisksfromGMfoods.-------------------------------------------练习题：Ⅰ.MatchthewordswiththeirChineseequivalents:1.disease-resistantA.掩盖(真相)2.side-effectB.高产的3.long-termdangersC.长期危害4.coverupD.副作用5.high-yieldE.抗病的Ⅱ.Question:WhatdocompanieswantingaGMproductapprovedintheUKorUSAdo?---------------------------------------------------------参考答案Ⅰ.1.E2.D3.C4.A5.BⅡ.Theyarerequiredtoprovi