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Module2DNA—theSecretofLifeCurrentlytherearesome20,000chemicalsinuse,butthescientistsonlyhavedetailedinformationonaround1,000ofthem.ToseetheadvantagesofGMfoodyouhaveonlytoconsidertherecentpressrevelationthattheaveragelettucereceiveselevenpesticideapplicationsbeforeitreachesthesupermarketshelf.I'msurechemicalsandtheirrolesindiseasewillbecomeabigissueinthenextcenturyasthepopulationofthedevelopedworldworriesincreasinglyaboutitshealth.ThereasonGMfoodwillnotgoawayisthatweneedathreefoldincreaseinfoodproductionbytheyear2050tokeeppacewiththeworld'spredictedpopulationgrowthtotenorelevenbillion.It'snotjustaquestionofmoremouthstofeedeither.Whatisoftenforgottenisthatalltheseextrapeoplewilltakeupspace,reducingtheoveralllandavailableforagriculture.Theworldhas800millionhungrypeople.Untilnow,foodsupplieshavebeenincreasedbyimprovedvarieties,pesticidesandartificialfertilizers:thegreenrevolution.Nowwe'reontheedgeofanewrevolution:ageneticone.ItmaywellbethatinthelongtermitisthedevelopingworldthatbenefitsmostfromGMfood.It'struethatforthenexttenyearsorsoGMcropsmaybetooexpensive.Butthelessonofpersonalcomputersisapplicablehere—oncethetechnologyhasbeendevelopedformoneyspinningcrops,likemaize,soybeansandcotton,itwillfilterdownandbecomeaffordableforall.Thisdoesn'tmean,unfortunately,thatfamineswilldisappear,butseverityanddurationwillbehelpedbyanimprovedabilitytoproduceanddistributefood.Aswemoveintothisneweraofagriculturewe'reembarkingonanexperiment.Butrememberthattheworldhasseenanumberofexperimentsbefore.Wehavebeenrefiningspeciesofwheatforseveralthousandyears.Geneticengineerslikemearenotdoinganythingasdramaticasmakingacabbageintoacauliflower—ashasbeendonebyplantbreedersinthepast.We'resimplytappingintothewholegenepool,ratherthanconcentratingononespeciesatatime.1．Accordingtothepassage,wecanseethattheauthorhasa/an________attitudetowardsGMfood.A．disappointedB．indifferentC．hopefulD．uncertain2．Whichofthefollowingstatementsiswrong?A．Chemicalsandtheirrolesindiseasewillbecomeabigprobleminthefuture.B．InthelongtermitisthedevelopedworldthatbenefitsmostfromGMfood.C．It'struethatforthenexttenyearsorsoGMcropsmaybetooexpensive.D．FamineswillnotcompletelydisappeareventhoughGMfoodbecomesaffordableinthefuture.【答案】1.C2.BSectionⅠReading[Introduction&ReadingandVocabulary(1)]新生词汇初识Ⅰ.词义搭配1．questionA．theworkofinquiringintosomethingthoroughly2．hereditaryB．becomedifferent；change；makesth.different3．investigationC．askwhathappens4．alterD．sth.thatfollowsfromanactionorsetofconditions5．consequenceE．relatedtothepassingofphysicalcharacteristicsthroughgenes【答案】1.C2.E3.A4.B5.DⅡ.用下列短语的适当形式填空takeafter；performanoperation；asaconsequenceof；underinvestigation；comparedwith；getridof1．Thisimprovementseemedinsignificant____________myfailures.2．Itissaidthatthecauseofthecollapseofthebridgeisstill____________.3．Yoursonissostubbornthathedoesn't____________youinanyway.4．Theoldnewspaperstakeuptoomuchspace,andwe'dbetter____________them.5．Afteramedicalconsultation,thedoctorsdecidedto______________onthepatientwithoutdelay.6．__________smoking,myfathercoughsfrequently.【答案】1.comparedwith2.underinvestigation3．takeafter4.getridof5.performanoperation6．Asaconsequenceof教材语篇细研Ⅰ.阅读P16－17课文内容，完成下面表Part1ThediscoveryofDNACrickandWatsonhadfoundtheanswertooneofthemostimportantquestionsofbiology—howdolivingthings1.________themselves?Everycellinourbodycontainsourgenes,whichpass2.______characteristicsontoourchildren.StoryA:JohnWaterskilledamanbutthepolicecouldn't3.________him,butafterDNAtechnologyinvention,scientistsfoundtheDNAfromJohn'scellandthatofthecellsheleftonthevictim4.______exactly.Part2FourstoriesaboutDNAStoryB:MikeandJuliaareveryrichandtheywantedagoodlookingandintelligentchild,soshehadasmallbutveryexpensive5.________.StoryC:MarkSawyerisatopathleteandwantstostaythatway,sohesecretlyvisitedasurgeonandhadanoperationinwhichthesurgeoninsertedananimal6.________intoMarkthatwouldmakehimrunfaster,soheisaworldchampionagain.Part2FourstoriesaboutDNAStoryD:Clarabecamepregnant,buthospitaltestsshowedthatherchildwouldbebornwithaterrible7.______illness,sosheandherhusbanddecidedtogetridoftheunbornbaby.Part3questionstodiscussWatsonandCrick'sdiscoveryaboutDNAwasthebeginningofenormousadvancesinthefieldof8.________.Ifwestartchoosingthecharacteristicsofourbabies,weare9.________natureinaverydirectway.Whatmightthe10.________be?Therearemanyimportantissuestodiscuss.【答案】1.reproduce2.hereditary3.arrest4.Matched5.operation6.gene7.inherited8.genetics9.altering10.consequencesⅡ.阅读P22课文内容，完成课文缩写Howwouldyoufeelifsomeonegaveyouanenvelope1.________adescriptionofeveryoneofyourgenes?It'sa2.________questiontoanswer.Butthefactis3.________scientistshavealreadybeguntodiscoverhowcertain4.________influenceus.Wehaveknownforalongtimethatmanyofourphysicalcharacteristicsare5.________.Forexample,oureyecolorandcertaindiseasesaredecidedbyourgenes.6.________othercharacteristics,thingsarenotso7.________.Scientistsarelearningthat8.________ourgenes9.________ourenvironmentaffectus.Scientistsmaysoonbeabletodescribeourgenes10.________11.________，butitdoesno