高一英语（下）必修四unit 2课时教案period 4

《高一英语（下）必修四unit 2课时教案period 4》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Period4Usinglanguage-----OrganicfarmingGOALS:1.Tolearnwhatisorganicfood.2.Toexpressfreelywiththelanguagethestudentshavelearned.3.Thestudentswillbecomemoreawareofthequalityofthefoodtheyareeating&buymoregreenfood..TEACHINGPROCEDURES:Step1FirstreadingReadthepassage,thenfindoutt

2、hetopicsentenceofeachparagraphPara1:Whatisorganicfarming?Para2:Thefertilizerthatorganicfarmerspreferisnaturalwastefromanimals.Para3:Organicfarmersinsistonchangingcropseverytwoorthreeyears.Step2SecondreadingReadthetextagainandanswerthefollowingquestions:1.Whatisorganicfarming

3、?2.Whatproblemsarecausedbyusingchemicalfertilizers?3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?Possibleanswers:Organicfarmingmeansgrowingcropswithoutchemicalfertilizers.----greenfoodTherearethreeproblems.Firstly,chemicalfertilizersaffectthesoilandthewatersupplyba

4、dly.Secondly,theyallowfarmerstogrowthesamecropyearafteryearandexhaustthesoil.Thirdly,theykillbothhelpfulandharmfulpests.Farmersgrowpeasorsoybeansaftercornorwheatsothatpeasandbeanscanputmineralsbackintothesoil,makingitrichandhealthyandreadytogrowmorewheatorcorn.Step3Thirdread

5、ingReadthetextagain,andfillinthefollowingforms.AdvantagesoforganicfarmingReasons1.Farmersusenaturalwastefromanimals.1.Thismakesthesoilricherinmineralsandsomorefertile.2.Thesoilisnotexhausted.2.Peasandsoybeansrenewthemineralsinthesoilbecomesrichandhealthy.3.Theyusethesoiltobe

6、stadvantage.3.Theyplantcropsthatneedsurfacesoilandnextcropsthatgrowatadeeperlevel.Sothewindandwaterdoesn’tcarryawaythesoil.Alltherichnessofthesoilisused.Whatarethedisadvantagesofusingchemicalfertilizers?1.Leavingchemicalsinthegroundforalongtimeisnotgoodforthesoilorthewatersu

7、pply.2.Farmeroftengrowthesamecropyearafteryear.Asaresult,thesoilgetsexhausted.3.Chemicalfertilizerskillbothhelpfulandharmfulbacteriaandpests.Step4RetellingRetellthetextaccordingtothechart:OrganicfarmingI.Organicfarming…natural/chemicalfertilizers单位：湖北省荆门　姓名：李国　E_mail：liguo61

8、9@sina.comII.Farmersprefernaturalwastefromanimals.Naturalfertilizer1.make…r