转基因食物利弊-英语作文

WhatisGMfood?TalkaboutthebenefitsandrisksofGMfood.GMfoods,socalledgeneticallymodifiedfoods,arethefoodsthatarederivedfromgeneticallymodifiedorganisms.GeneticallymodifiedorganismshavehadspecificchangesintroducedintotheirDNAbygeneticengineeringtechniques.GMtechnologyistheseparationanddecoratedartificialgenesintothegenomeoforganisms,andtogeneexpression,accesstonewtraitsofbiologicaltechnology.Sincethistechnologywaspracticed,geneticallymodifiedfoodhasdevelopedalot.In1983,world’sfirstcaseofsuccessfulcultivationistobacco.In1994,theU.S.firstcaseofGMfoodistomatoes.In1996,large-scaleproductionhascomeintouse.Sincethat,theamountofGMfoodsincreasedby52timeseachyear.Peoplehavesharedalotofadvantagesastimewentby.GMcropsaremoreproductiveandhavealargeryield.Theycanoffermorenutritionalvalueandbetterflavor.Whatismore,apossibilitythattheycouldeliminateallergy-causingpropertiesinsomefoodsandinbuiltresistancetopests,weedsanddisease.Theyarealsomorecapableofthrivinginregionswithpoorsoiloradverseclimatesandremainingfreshlonger.Still,atthesametime,muchdangerhasbeenputupalltheway.Forexample,inAugust1998,aBritishresearchinstitutereportedthatratsateGMpotatoes,whichwasinsect-resistanttransgenicpotatoesproducedbysnowdroplectin.Andtherewasdamagetointernalorgansandimmunesystemsandthisimpededthegrowthofmice.Apartfromwhatwehavementionedabove,geneticallymodifiedfoodshasalsoexertedinfluenceonthepossibleimpactofhumanconsumptionandmayaffecttheecologicalenvironment,suchassuperweedproblems,theimpactofbiodiversityanddestructionofecologicalbalance.Whatismoreserious,GMcropsmayexpandto“geneticpollution”,whichmightdestroythebiodiversity,leadingtoextinctionofindividualspecies,affectthehiddendangersofbiologicaldiversityandGMfoodshaveyettoappeardirectlyharmfultohumancases.Inmyopinion,thebenefitsoutweighthepotentialrisks.Oneonehand,trustinfoodsafetyandregulatorysystems.Ontheotherhand,watchoutthefurthersafetyevaluationandriskassessment.