高中英语《Unit 2 Working the land》period 3课件 新人教版必修4.ppt

Period3,Workingtheland,chemicalproductionbacteriapestnutritionmineral,adj.化学的；关于化学的n.生产；制造n.细菌n.害虫；害兽；害鸟n.营养；滋养；食物n.矿物；矿石,Warmingup,WordsPreview,discoveryfocussoilreduceroot,n.发现；发觉n.焦点；中心点vt.集中；聚焦n.土壤vt.减少；减缩n.根；根源,skimunderlinesummarycomment,vt.浏览；略读vt.画底线标出；强调n.总结；摘要；概要n.评论；议论vi.做出评论,buildupleadtofocusonkeepfreefrom/of,逐渐增强;建立;开发导致;造成(后果)集中(注意力，精力等)于使免受(影响，伤害等)；使不含(有害物),FirstreadingReadthepassage,thenfindoutthemainideaofeachparagraph.,Para1:Para2:Para3:,Whatisorganicfarming?,Farmersprefernaturalwastefromanimals.,Farmerschangecropseverytwoorthreeyears.,Presentation,SecondreadingReadthetextagainandanswerthefollowingquestions:1.Whatisorganicfarming?2.Whatproblemsarecausedbyusingchemicalfertilizers?3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?,1.Whatisorganicfarming?,Organicfarmingmeansgrowingcropswithoutchemicalfertilizers.,2.Whatproblemsarecausedbyusingchemicalfertilizers?,Therearethreeproblems.First,chemicalfertilizersaffectthesoilandthewatersupplybadly.Second,theyallowfarmerstogrowthesamecropyearafteryearandexhaustthesoil.Third,theykillbothhelpfulandharmfulpests.,3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?,Farmersgrowpeasorsoybeansaftercornorwheatsothatpeasandbeanscanputmineralsbackintothesoil,makingitrichandhealthyandreadytogrowmorewheatorcorn.,ThirdreadingReadthetextagain,andfillinthefollowingforms.,2.Thesoilisnotexhausted.,2.Peasandsoybeansrenewthemineralsinthesoilbecomesrichandhealthy.,3.Theyusethesoiltobestadvantage.,3.Theyplantcropsthatneedsurfacesoilandnextcropsthatgrowatadeeperlevel.Sothewindandwaterdoesntcarryawaythesoil.Alltherichnessofthesoilisused.,Advantagesoforganicfarming,Reasons,1.Thismakesthesoilricherinmineralsandsomorefertile.,1.Farmersusenaturalwastefromanimals.,1.Leavingchemicalsinthegroundforalongtimeisnotgoodforthesoilorthewatersupply.,2.Farmeroftengrowthesamecropyearafter.Asaresult,thesoilgetsexhausted.,3.Chemicalfertilizerskillbothhelpfulandharmfulbacteriaandpests.,Languagepoints,1Thesechemicalsinthefoodsupplybuildupinpeoplesbodiesovertime.buildup增强;建立；开发Hardworkingconditionsbuildupcharacter.艰苦的工作条件能磨练人的性格。,2Manyofthesechemicalscanleadtocancerorotherillnesses.leadto:导致；造成Toomuchworkandtoolittlerestoftenleadtoillness.过量的工作和过少的休息会引起疾病。AllroadsleadtoRome.条条大道通罗马。,3Theyfocusonkeepingtheirsoilrichandfreeofdisease.focuson:集中(注意力，精力等）于Youshouldfocusyourattentiononyourwork.把注意力集中在你的工作上。Olympus:Focusonlife.奥林巴斯：瞄准生活。,4Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.keepsfreefrom/of:使免受（影响，伤害登）；使不含（有害物）keepfrom:阻止;妨碍Ihopeyouwillkeepfromdoinganythingrash.我希望你不要做出任何鲁莽的事情来。,Writing,UsetheideasyoudiscussedabovetowriteareportabouthowusefulJiaSixiesideasareformoderntimes.Usethestepsonpage53tohelpyou.,1,600yearsagotheChinesewriterJiaSixiewroteabookQiMinYaoShuaboutgoodagriculturalpractices.TodaysomeofJiaSixiesideasarestillveryusefultoourmoderntimes,butwehavesomeproblemstodaythatheneverhadinhistime.,Samplewriting,SomeofJiaSixiesideasarestillveryusefultoourmoderntimes.Farmersstillcleartheirfieldsofweeds.Theystillploughdeeplythefirsttimeandlessdeeplythesecondtime.Inaddition,farmerseverywherestillunderstandthatchangingcropsinthefieldsisstillimportant.,However,wehavesomeproblemstodaythatJiaSixieneverfacedinhistime.Wehaveenvironmentalpollutionthatharmsfieldsandcrops.Wehavegreatcompetitioninthemarketplace.Wehavenew,dangerousandpowerfulcropdiseases.,AlthoughourmodernfarmersstillusesomeofJiaSixiesideastoday,theyfaceproblemsthatwereneverheardofinJiaSixieday.,Exercises选词填空（occupation,job,profession,work)a.Pleasestateyourname,ageand_below.b.Ihaveafew_todointhehousethismorning.c.Lookingafterchildrenalldayishard_d.Myhusbandisattheverytopofmedical_.,occupation,jobs,work,profession,完成句子：Stoptalkingand_.(专心工作)b.Everyone_(集中注意力)whentheyhaveanexam.c.Idecidedto_(全力以赴)findingsomewheretolive.,concentrateonyourwork,concentratesthemind,concentrateallmyeffortson,2.Difficulties,CanIgooutonastoryimmediately?我可以马上出去采访吗？on后接一些名词如visit,holi