人教课标版高一英语下学期必修4Unit 2 Working the land Using language 课件.ppt

,Book4Unit2WorkingthelandUsingthelanguagePara11.Whatisorganicfarming?,Organicfarmingmeansgrowingcropswithoutchemicalfertilizers.,Par.2(2)Whataretheadvantagesofusingnaturalfertilizer?Firstly,itcanmakethesoilricherinmineralsandsomorefertile.Secondly,itcanhelpreducediseasesincropsandhelpthemgrowstrongandhealthy.Besides,itcankeeptheair,soilandwateraswellasthefoodsupplyfreefromchemicals.,Par.2(3)Whatarethedisadvantagesofusingchemicalfertilizers?Firstly,leavingchemicalsinthegroundforalongtimeisnotgoodforthesoilorthewatersupply.Secondly,farmersoftengrowthesamecropyearafteryear.Asaresult,thesoilgetsexhausted.Thirdly,chemicalfertilizerskillbothhelpfulandharmfulbacteriaandpests.,Threeways.Theyarechangingcropseverytwoorthreeyears,plantingseedsindifferentlayersofsoilandplantinggrassbetweencropstopreventthesoilbeingblownaway.,Par.3,(4)Howmanywaysdoorganicfarmersusetokeepthesoilfertile(rich)andwhatarethey?,Summarizing:Readagainandfindoutthemainideaofeachparagraph.,Para1:Para2:Para3:,Whatorganicfarmingis.,Howorganicfarmerskeepthesoilfertile.,Whytheorganicfarmersprefertousenaturalfertilizerratherthanchemicalfertilizers.,Organicfarming,Cropsgrowingwithnaturalratherthanchemicalfertilizer,Naturalwastefromanimals,Makethesoilricherinmineralsandmorefertile,Ahealthysoil,Reducediseasesincrops,Helpcropsgrowstrongandhealthy,Changecropseverytwoorthreeyears,Corn,wheat,Peassoybeans,Putthemineralsbackintothesoil,makingitrichandhealthy,Cropsthatusethesurfaceofthesoil(peanuts),Cropsthatneedadeeperlevelofsoil(rootvegetable),Makesurethatwhatisleftinthegroundafterharvestingbecomesanaturalfertilizerforthenextyearscrop,keepthesoilfertile,Chemicalfertilizer,Notgoodforthesoilorthewatersupply,Thesoilgetsexhausted,Killbothhelpfulandharmfulbacteriaandpests,Retellthetextaccordingtothechart:OrganicfarmingI.Cropsgrowingwithnaturalfertilizers.II.Farmersprefernaturalwastefromanimals.,Chemicalfertilizer,1.makericherandmorefertile2.reduceandhelpstrong3.thefertilizerskillandhealthy4.keepfreefromchemicals,1.leavingisnotgood2.growyearafteryear,Aquiz:,Organicfoodjustreferstovegetablesandfruits.Greenfoodhasacolorofgreen.Greenfoodiscertaintobehealthyandsafe.Organicfoodisfreeofchemicalfertilizers.Organicfoodisgrownawayfromdirtywatersupply.Greenfoodcanbegrownaroundbigpaperfactories.,Speaking,Haveaconversationinpairs,withonestudentasthefarmerandtheotherasthecustomer.Thefarmerispersuadingthecustomertobuyhis/her“greenfood”.,Youneedto.Itsbetterto.Thisisgoodvaluebecause.Theadvantagesare.Itsmoreexpensivebut.YoulltastethedifferencewhenIdpreferbecause,Idontlike.because.IfIhaveachoiceIllchoose.Whatstheadvantageof.?Idrather.Itsagreatpitythat.?,Writing,Writedownthesummaryofthetext(about40words)ingroupsof4.Thispassagetellsus,Whatsthemainidea(summary)ofthewholepassage?,Asummary(概括)oforganicfarming:,nouseofchemicalfertilizersawayfromindustrialareasawayfromdirtywatersupplynoairpollutionsomespecialwaysoffarmingtousethefoodshouldbehealthyandsafe,Thereisabigpieceoffieldnearyourschool.Theschoolisplanningtogrowsomegreenfoodinthefield.Makeaplanwithyourgroupmembers:,Whatgreenfoodtogrowandwhy?Howtodevelopthesoil?Whatspecialwaystogrowit?Whatspecialwaystotakecareofyourcrop?,Suppose:,Makeaposter（海报）:,tellpeoplewhatyouaresellingmakepeoplebelieveyourfoodisgoodenoughpersuadepeopletobuyyourfoodmakeyou