2014届最新高考英语一轮单元复习 精品阅读理解提升文章精选一百篇（74）.doc

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1、2014届最新高考英语一轮单元复习精品阅读理解提升文章精选一百篇（74）Unit75　　TheConcernsaboutGeneticallyModifiedFood　　GeneticModification(GM)hasthepowertosavelivesthroughitsuseinmedicine,suchastheproductionofinsulinfordiabeticsorthetreatmentofgeneticdisorders.Thecurrentoutcrycomeswhenitisusedto

2、producefood.Someofthesepublicconcernsreflectrealproblems,butothersarefuelledbymisinformationandover-dramatization.　　Thereisnothingnewaboutcropmodification;plantbreedershavebeendoingthissinceagriculturebegan.Thewonderfulrangeofapplesorpotatoeswenowenjoyistheresul

3、tofcrossingdifferentvarieties.Cabbages,Brusselssprouts,cauliflower,kohlrabiandbroccolialloriginatedfromonebotanicalspecies.　　Modernmoleculebiologyhasenabledustogomuchfurther.Wecannowisolatethegenefromaparticularcharacteristicofanorganismandtransferittoanotherspe

4、cies.Itisthispracticeoftransformingaplantwithaliengenes--perhapsfromananimalorbacterium--thatiscausingallthecontroversy.　　Therearefourmainconcerns.　　Scientistscannowtakeageneforresistancetoparticularherbicideandtransplantittoacrop:whentheseplantsaresprayedwithwe

5、edkiller,theweedsweredestroyedwhilethecropisunharmed.Aprimeconcernistheharmfuleffectthiscouldhaveonthebiodiversityoffarmland,wheresomanyinsects,birdsandotheranimalsdependon"weed"species.　　AnotherfearisthataliengenesfromaGMplantcouldescapeintoawildpopulationofare

6、latedspecies.Sinceplantsarefertilizedbypollencarriedthroughair,oftenforlongdistances,thisisentirelypossible.Awildspeciesmodifiedinthiswaywithpesticideresistancecouldbecomeasuperweed,whileaspeciesthatbecameunnaturallyresistanttoanimalscoulddisruptthefoodchain.　　T

7、hethirdworryconcernsaproposaltoproduceseedsforcerealsthatcannotproducenextyear'sseeds.This"terminatortechnology"wouldbenefitseedcompanies,sincefarmswouldbeforcedtobuynewseedsannually.Butthesametechnologycouldbedevastatingtosomefarmersinthedevelopingcountrieswhod

8、ependonsavingseedsfornextyear'scrop.Fortunatelythistechnologyisnotyetinuseandtherehasbeenstrongpressuretoabandonit.　　Itisunlikelythatthecurrentmodificationsareharmful