高一英语Working the land课件2.ppt

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1、Unit2UsinglanguageReadingFirstreading(3ms)Readthepassage,thenfindoutthemainideaofeachparagraph.Para1:Para2:Para3:Whatisorganicfarming?Farmersprefernaturalwastefromanimals.Farmerschangecropseverytwoorthreeyears.Secondreading(5ms)Readthetextagainandanswerthefollowingquesti

2、ons:1.Whatisorganicfarming?2.Whatproblemsarecausedbyusingchemicalfertilizers?3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?1.Whatisorganicfarming?Organicfarmingmeansgrowingcropswithoutchemicalfertilizers.2.Whatproblemsarecausedbyusingchemicalfertilizers?Therear

3、ethreeproblems.First,chemicalfertilizersaffectthesoilandthewatersupplybadly.Second,theyallowfarmerstogrowthesamecropyearafteryearandexhaustthesoil.Third,theykillbothhelpfulandharmfulpests.Farmersgrowpeasorsoybeansaftercornorwheatsothatpeasandbeanscanputmineralsbackintoth

4、esoil,makingitrichandhealthyandreadytogrowmorewheatorcorn.3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?Thirdreading(8ms)Readthetextagain,andfillinthefollowingforms.2.Thesoilisnotexhausted.2.Peasandsoybeansrenewthemineralsinthesoilbecomesrichandhealthy.3.Theyus

5、ethesoiltobestadvantage.3.Theyplantcropsthatneedsurfacesoilandnextcropsthatgrowatadeeperlevel.Sothewindandwaterdoesn’tcarryawaythesoil.Alltherichnessofthesoilisused.AdvantagesoforganicfarmingReasons1.Thismakesthesoilricherinmineralsandsomorefertile.1.Farmersusenaturalwas

6、tefromanimals.Whatisthedisadvantageofusingchemicalfertilizers?1.Leavingchemicalsinthegroundforalongtimeisnotgoodforthesoilorthewatersupply.2.Farmeroftengrowthesamecropyearafter.Asaresult,thesoilgetsexhausted.3.Chemicalfertilizerskillbothhelpfulandharmfulbacteriaandpests.

7、Retelling(8ms)Retellthetextaccordingtothechart:OrganicfarmingI.Cropsgrowingwithnaturalfertilizers.II.Farmersprefernaturalwastefromanimals.NaturalfertilizerChemicalfertilizer1.make…richerandmorefertile2.reduce…andhelp…strong3.thefertilizerskill…andhealthy4.keepfree…fromch

8、emicals1.leaving…isnotgood2.grow…yearafteryearIII.Farmerschangecropseverytwoorthreeyears.…tomakesurewha