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1、29.FoodFrightExperimentsunderwayinseverallabsaimtocreatebeneficialtypesofgeneticallymodified(GM)foods,includingstarchierpotatoesandcaffeine-freecoffeebeans.Geneticengineersareeventryingtotransfergenesfromacold-winterfishtomakeafrost-resistanttomato.Alow-sugarGMstrawberrynowintheworksmightonedayal
2、lowpeoplewithhealthproblemssuchasdiabetestoenjoythelittledeliciousredfruitsagain.GMbeansandgrainssuperchargedwithproteinmighthelppeopleatriskofdevelopingkwashiorkor.Kwashiorkor,adiseasecausedbyseverelackofprotein,iscommoninpartsoftheworldwherethereareseverefoodshortages.CommentingonGMfoods,Jonath
3、onJones,aBritishresearcher,said:"Thefuturebenefitswillbeenormous,andthebestisyettocomeH.Tosomepeople,GMfoodsarenodifferentfromunmodifiedfoods.nAtomatoisatomato/1saidBrianSansoni,anAmericanfoodmanufacture匚CriticsofGMfoodschallengeSansonifsopinion.TheyworryabouttheharmthatGMcropsmightdotopeople,oth
4、eranimals,andplants.InarecentlabstudyconductedatCornellUniversity,scientiststestedpollenmadebyBtcorn,whichmakesupone-fourthoftheU.S.corncrop.Thescientistsprinkledthepollenontomilkweed,aplantthatmakesamilkyjuiceandistheonlyknownfoodsourceofthemonarchbutterflycaterpilla匚Withinfourdaysofmunchingonth
5、emilkweedleaves,almosthalfofatestgroupofcaterpillarshaddied."Monarchsareconsideredtobeaflagshipspeciesforconservation.11saidCornellresearcherLindaRayno匚nThisisawarningbell.nSomeinsectsthatarenotkilledbyGMfoodsmightfindthemselvesmadestronger.Howso?Theinsecticidesusedtoprotectmostoftoday'scropsares
6、prayedonthecropswhenneededanddecayquicklyintheenvironment.ButGMplantsproduceacontinuouslevelofinsecticide.Insectspeciesfeedingonthosecropsmaydevelopresistancetotheplantsandcoulddosoinahurry,saythecritics.InsectsmayalsodeveloparesistancetotheinsecticideBt.AttheforumonGMfoodheldlastyearinCanada.GMc
7、ropsthathavebeenmaderesistanttotheherbicidemightcrossbreedwithwildplants,creating"superweeds”thatcouldtakeoverwholefields.Sowheredoyoustand?ShouldGMfoodbebannedintheUnitedStates,astheyareinpartsofEurope?Ordotheirbenefi
