2015-2016学年高中英语《Unit 2 Working the land》period 3课件

Period3chemicalproductionbacteriapestnutritionmineraladj.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WarmingupWordsPreviewdiscoveryfocussoilreducerootn.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skimunderlinesummarycommentvt.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.&vt.表达意见;做出评论buildupleadtofocusonkeep…freefrom/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.PresentationSecondreadingReadthetextagainandanswerthefollowingquestions: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.Sothewindandwaterdoesn’tcarryawaythesoil.Alltherichnessofthesoilisused.AdvantagesoforganicfarmingReasons1.Thismakesthesoilricherinmineralsandsomorefertile.1.Farmersusenaturalwastefromanimals.Whatisthedisadvantageofusingchemicalfertilizers?1.Leavingchemicalsinthegroundforalongtimeisnotgoodforthesoilorthewatersupply.2.Farmeroftengrowthesamecropyearafter.Asaresult,thesoilgetsexhausted.3.Chemicalfertilizerskillbothhelpfulandharmfulbacteriaandpests.Languagepoints1Thesechemicalsinthefoodsupplybuildupinpeople’sbodiesovertime.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.keeps…freefrom/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。WritingUsetheideasyoudiscussedabovetowriteareportabouthowusefulJiaSixie’sideasareformoderntimes.Usethestepsonpage53tohelpyou.1,600yearsagotheChinesewriterJiaSixiewroteabookQiMinYaoShuaboutgoodagriculturalpractices.TodaysomeofJiaSixie’sideasarestillveryusefultoourmoderntimes,butwehavesomeproblemstodaythatheneverhadinhistime.SamplewritingSomeofJiaSixie’sideasarestillveryusefultoourmoderntimes.Farmersstillcleartheirfieldsofweeds.Theystillploughdeeplythefirsttimeandlessdeeplythesecondtime.Inaddition,farmerseverywherestillunderstandthatchangingcropsinthefieldsisstillimportant.However,wehavesomeproblemstodaythatJiaSixieneverfacedinhistime.Wehaveenvironmentalpollutionthatharmsfieldsandcrops.Wehavegreatcompetitioninthemarketplace.Wehavenew,dangerousandpowerfulcropdiseases.AlthoughourmodernfarmersstillusesomeofJiaSixie’sideastoday,theyfaceproblemsthatwereneverheardofinJiaSixie’day.Exercises选词填空（occupation,job,profession,work)a.Pleasestateyourname,ageand_________below.b.Ihaveafew_____todointhehousethismorning.c.Lookingafterchildrenalldayishard____d.Myhusbandisattheverytopofmedical____________.occupationjobsworkprofession完成句子：a.Stoptalkingand________________________.(专心工作)b.Everyone____________________(集中注意力)whentheyhaveanexam.c.Idecidedto________________________(全力以赴)findingsomewheretolive.concentrateonyourworkconcentratesthemindconcentrateallmyeffortson2.Difficulties1)CanIgooutonastoryimmediately?我可以马上出去采访吗？on后接一些名词如visit,holiday,business,trip等，与come,go等动词连用，用来说明活动或状态。Practice:她决定今年暑假去一趟英国。Shedecidedtogo______________toEnglandthissummer.他去了长途旅行。Hehasbeenaway__________________.onavisitonalongtripHomework1.Trytocorrecttheposter.2.Finishtheexercisesonworkbook.