高中英语 Unit 2 Working the land Period 4 Using Language课件 新人教版必修4.ppt

Unit2Workingtheland,Usinglanguage,2,3,1.Masterthefollowingnewwords,phrasesandsentencesinusinglanguageproduction,bacteria,pest,nutrition,discovery,soil,rootregret,reduce,regretbuildup,keepfreefrom,leadto,focuson,inadditionSomeorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil2.Learntheadvantagesoforganicfarming.,本课首先观看嘉世有机农业视频，引出本节题目“化学耕作还是农业耕作”。进而讨论化学耕作和有机耕作的概念。化学耕作的弊端是什么？为什么农民转而开始有机耕作？有机耕作通过什么方法来保持土地的肥沃？然后让学生听课文录音，了解短文的主旨以及各段的大意。最后讲解短文的语言点。最后通过改写的短文加深对本文的了解。讲解农业耕作是配有相关的视频，有助于学生理解。总结概括文章和段落大意，提高学生的理解和表达能力。听课文录音有助于学生听力水平的提高。,Reading,CHEMICALORORGANICFARMING?,Whatcanweharvest?,Nopains,nogains.,Addfertilizerintothesoil,Howcanfarmersmaketheplantsgrowwell?,Howmanykindsoffertilizersdofarmersuse?,naturalfertilizerorganicfarming,chemicalfertilizerchemicalfarming,Twokinds.,Discussion:Whichkindoffarmingisbetter?,Better,Letslearnmoreaboutchemicalandorganicfarming!Listentothetapecarefully.,organicfarmingisbecomingmorepopular.,Themainideaofthetext:,FastReading,Long-termuseofchemicalfertilizerscancausedamagetothelandandpeopleshealth.,Problemscausedbychemicalfertilizers.,Themainideaofeachparagraph,P1.,P2.,Farmersandcustomersturntoorganicfarming.,Othermethodstokeepthesoilfertile.,P3.,P4.,CarefulReading,Whyarechemicalfertilizerssopopularinfarmingtoday?Becausetheyarecheap.Theyareagoodwaytostopcropdiseaseandincreaseproduction.Theycancausedamagetotheland.Theydogoodtopeopleshealth.,ParagraphI,Chemicalfarming,stopcropdiseaseincreaseproduction,damagetheland,bykillingthehelpfulbacteriaandpestsaswellastheharmfulones.,affectcrops,bystayinginthegroundandundergroundwaterforalongtime,leadtocancer/illnesses,bybuildingupinpeoplesbodiesovertime,havelessnutrition,bygrowingtoofast,Paragraph2,Organicfarming,Naturalwastefromanimals,Makethesoilricherinmineralsandmorefertile,Ahealthysoil,Reducediseasesincrops,Helpcropsgrowstrongandhealthy,Paragraph3,Organicfarming,usenaturalwaste,makethesoilrichinminerals,changethecrop,putmineralsbackintosoil,making,plantcropswithdifferentroots,usedifferentlevelsofland,plantgrassbetweencrops,preventfrom,anaturalfertilizer,Paragraph4,1.WhichstatementisWRONGaccordingtothetext?A.Allcropsareorganic.B.Recently,theterm“organicfarming”hasgainedanothermeaning.C.Allfarmersusefertilizers.D.Scientistsbelievesomechemicalfertilizersarebetterforpeople.,Readagainandchoosethebestanswer.,D,2.Whichisnotthereasonwhyorganicfarmersprefernaturalwastefromanimals?A.Itcankeepthefoodfreefromchemicals.B.Itcankeeptheair,soilandwaterfreefromchemicals.C.Itcankillharmfulpests.D.Itcanmakethesoilricherinmineral.,C,3.Whatistheadvantageofusingchemicalfertilizers?A.Leavingchemicalsinthegroundforalongtimeisgoodforwatersupply.B.Theycangetthesoilexhausted.C.Theycankillhelpfulbacteria.D.Theycankillharmfulpest.,D,4.Theorganicfarmersdothefollowingsexcept_.A.addingfertilizerswhichisrichinmineralB.changingcropseverytwoorthreeyearsC.plantingseedsindifferentlayersofthesoilD.plantinggrassbetweencropstopreventthesoilfrombeingblownaway,A,1.Whatis“organicfarming”?,Answerthequestions.,Itreferstocropsgrowingwithnaturalratherthanchemicalfertilizers.,2.Whatdoorganicfarmersprefertouseasfertilizer?,Naturalwastefromanimals.,Becausepeasandbeanscanputmineralsbackintothesoil,makingitrichandhealthyandreadytogrowmorewheatorcorn.,3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?,4.Whatisthemaingoalforusingorganicfarmingmethods?,TogrowgoodfoodandtoavoiddamagingTheenvironmentorpeopleshealth.,NouseofchemicalfertilizersAwayfromindustrialareasAwayfromdirtywatersupplyNoairpollution,Asummaryoforganicfarming:,FillintheblanksManyfarmerswelcome_fertilizersbecausetheyaregreatwaytostopcropdiseaseandincrease_.Butthesechemicalcan_toillnesses.Sofarmersbegantoturnto_farming.They_onkeepingtheirsoilrichand_ofdisease.Organicfarmersoftenpreferusing_wasteofanimalsasfertilizer.Thiskeepsthesoilfree_chemicals.Therearemanymethodstokeepthesoil_.Themethodshavethesamegoal:togrowgoodfoodandavoiddamagingthe_orpeopleshealth.,chemical,production,focus,free,natural,from,fertile,environment,lead,organic,1.Thesechemicalsinthefoodsupplybuildupinpeoplesbodiesovertime.,LanguagePoints,Hardworkingconditionsbuildupcharacter.,buildup增强;建立;开发,艰苦的工作条件能磨练人的性格。,2.Manyofthesechemicalscanleadtocancerorotherillnesses.,AllroadsleadtoRome.,leadto导致；造成,条条大道通罗马。,3.Theyfocusonkeepingtheirsoilrichandfreeofdisease.,focuson:集中(注意力,精力等)于,Youshouldfocusyourattentiononyourwork.,把注意力集中在你的工作上。,4.Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.,4.,Youmusttakecaretokeepthewoundfreefromthedirt.,keepsfreefrom/of:使免受(影响,伤害等);使不含(有害物),你必须照顾好伤口，免受灰尘的伤害。,5.reducev.减少,降低e.g.公司尽力通过减少花销来提高利润。Thecompanytriestoincreaseprofitsby_.今年我们已经减少了业务开支。We_expensesthisyear.,reducingcosts,havereduced,Expressions,1.化肥2.对造成损害3.洗掉某物4.导致;造成(后果);通往5.逐渐增强,建立6.另外(还有)7.使免受(影响);8.集中(注意力、精力)于9.每隔几年10.避免做,chemicalfertilizerscause/dodamagetowashoffleadtobuildupinaddition(to)keepfreefrom/offocusoneveryfewyearsavoiddoing,Exercises,washoff,leadto,buildup,inaddition(to),keepfreefrom/of,focuson,avoiddoing,1.Hismistakes_hisfailure.2.Thesechemicalsinthefoodsupply_inpeoplesbodiesovertime.3.Allroads_Rome.4.Please_yourmind_thefollowingproblem.5.Childrenshould_violence.,le