高一英语（下）必修四Unit 2 Using language.ppt

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1、Unit2WorkingtheLandUsinglanguageReadingFirstreadingReadthepassage,thenfindoutthemainideaofeachparagraph.Para1:Para2:Para3:Whatisorganicfarming?Farmersprefernaturalwastefromanimals.Farmerschangecropseverytwoorthreeyears.SecondreadingReadthetextagainandan

2、swerthefollowingquestions:1.Whatisorganicfarming?2.Whatproblemsarecausedbyusingchemicalfertilizers?3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?1.Whatisorganicfarming?Organicfarmingmeansgrowingcropswithoutchemicalfertilizers.2.Whatproblemsare

3、causedbyusingchemicalfertilizers?Therearethreeproblems.First,chemicalfertilizersaffectthesoilandthewatersupplybadly.Second,theyallowfarmerstogrowthesamecropyearafteryearandexhaustthesoil.Third,theykillbothhelpfulandharmfulpests.Farmersgrowpeasorsoybeans

4、aftercornorwheatsothatpeasandbeanscanputmineralsbackintothesoil,makingitrichandhealthyandreadytogrowmorewheatorcorn.3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?ThirdreadingReadthetextagain,andfillinthefollowingforms.Advantagesoforganicfarmin

5、g2.Thesoilisnotexhausted.3.Theyusethesoiltobestadvantage.1.Farmersusenaturalwastefromanimals.2.Peasandsoybeansrenewthemineralsinthesoilbecomesrichandhealthy.3.Theyplantcropsthatneedsurfacesoilandnextcropsthatgrowatadeeperlevel.Sothewindandwaterdoesn’tca

6、rryawaythesoil.Alltherichnessofthesoilisused.Reasons1.Thismakesthesoilricherinmineralsandsomorefertile.Whatisthedisadvantageofusingchemicalfertilizers?1.Leavingchemicalsinthegroundforalongtimeisnotgoodforthesoilorthewatersupply.2.Farmeroftengrowthesamec

7、ropyearafter.Asaresult,thesoilgetsexhausted.3.Chemicalfertilizerskillbothhelpfulandharmfulbacteriaandpests.RetellingRetellthetextaccordingtothechart:OrganicfarmingI.Cropsgrowingwithnaturalfertilizers.II.Farmersprefernaturalwastefromanimals.Naturalfertil

8、izerChemicalfertilizer1.make…richerandmorefertile2.reduce…andhelp…strong3.thefertilizerskill…andhealthy4.keepfree…fromchemicals1.leaving…isnotgood2.grow…yearafteryearIII.Farmerschangecropseverytwoorthreeyears.…tomakesurewhatislef