高中二年級上學(xué)期英語《讀寫之 Chemical Farming Versu》教學(xué)課件

CHEMICALFARMINGVERSUSORGANICFARMINGBytheendoftheclass,we’llbeabletoworkoutthecontent,structureandlanguage

featuresofthetext.writeouropinionsinanessayaboutchemicalfarmingororganicfarming.WarmupWhatdoesthispictureshow?Where?What?Why?...WarmupWhatdoesthispictureshow?Inthefield,afarmerissprayingthecropswithpesticidestoprotectthemfrombeingdamagedbyharmfulinsectsanddisease.Thenwhydoyouthinkthefarmeriswearingglovesandamask?WarmupWhatdoesthispictureshow?Becauseofthechemicalpesticides.It’salwaysagoodideatousesafetyequipmentwhenexposedtothem.Withsuchharm,whydowestillapplychemicalsintothefield?Pre-reading:predictionVERSUSusedtocomparetwodifferentideas,choices,etc.Whatdoyouthinkwillbeincludedinthereading?Thebenefitsoforganicfarming?Thedrawbacksofchemicalfarming?While-reading:Activity1Readthetext,checkyourprediction,andanswerthequestions.1.Whatischemicalfarming?2.Whatisorganicfarming?While-reading:Activity1Whatischemicalfarming?Chemicalpesticidesandartificialfertilizershavebeeninwidespreaduseinfarmingsincethemiddleofthe20thcentury.(Paragraph1)commonChemicalfarmingisfarmingusingchemicalpesticidesandartificialfertilizersWhile-reading:Activity1Whatisorganicfarming?Organicfarmingissimplyfarmingwithoutusinganychemicals.While-reading:Activity2Readthetext,andanswerthequestionsonpage56.1.Whydidmanyfarmerswelcometheintroductionofchemicalfarming?2.Whatconcernsmanypeopleabouttheuseofpesticides?3.Whatisoneproblemwiththeuseofchemicalfertilizers?While-reading:Activity2Readthetext,andanswerthequestionsonpage56.4.Howisorganicfarmingdifferentfromchemicalfarming?5.Whydoorganicfarmerschangethekindofcropgrowninafieldeveryyear?6.Whatisthegoalofusingorganicfarmingmethods?Doyouthinkitcanbereached?Whyorwhynot?While-reading:Activity21.Whydidmanyfarmerswelcometheintroductionofchemicalfarming?Manyfarmerswelcomeitasagreatwaytofightcropdiseaseandincreaseproduction.While-reading:Activity22.Whatconcernsmanypeopleabouttheuseofpesticides?Theirlong-termusecansometimesharmboththelandandpeople’shealth.Overtime,however,whatsomescientistshavefoundisthattheirlong-termusecansometimesharmboththelandandpeople’shealth.（Para.1）

While-reading:Activity23.Whatisoneproblemwiththeuseofchemicalfertilizers?Cropsgrownwiththemusuallygrowtoofasttoberichinnutrition.While-reading:Activity24.Howisorganicfarmingdifferentfromchemicalfarming?Organicfarmingissimplyfarmingwithoutusinganychemicals.Organicfarmersfocusonkeepingtheirsoulrichandfreeofdiseasethroughnaturalmeans.While-reading:Activity25.Whydoorganicfarmerschangethekindofcropgrowninafieldeveryyear?Differentcropsaregrownbecausetheyputimportantmineralsbackintotheground,makingitreadyforthenextbatchofcrops.While-reading:Activity26.Whatisthegoalofusingorganicfarmingmethods?Doyouthinkitcanbereached?Whyorwhynot?Thegoalofusingorganicfarmingmethodsistogrowgoodfoodwhileavoidingdamagetotheenvironmentortopeople’shealth.Yes,becausefarmersworkedforcenturieswithoutusinganykindsofchemicalsandwithoutharmingtheenvironment,andthefoodtheyproducewasjustfine.While-reading:Activity3MatchthemainideaA-Dwiththeparagraphs.Thencompletethesentencesinthetable.Para.1-2Mainidea:Chemicalpesticidesandartificialfertilizershavebeeninwidespreaduseinfarming...Overtime,however,whatsomescientistshavefoundisthattheirlong-termusecansometimesharmboththelandandpeople’shealth.Forexample,...theyoftenhavelessflavoraswell.DTheproblemswithchemicalfarmingPara.3Mainidea:AWhatorganicfarmingisDetail:Pesticidescankillhelpfulbacteriaandinsects.Somepesticideshavebeenprohibitedbecauseofthedamagetheycause.Cropsgrownwithchemicalfertilizersusuallygrowtoofasttobefullinnutrition.Para.4 Mainidea:COrganicmethodsforproducingrichsoilDetail:TheyoftenchangethekindofcropgrownineachfieldeveryyearTheyalsoplantcropsthatusedifferentdepthsofthesoiltohelpkeepitrichPara.5 Mainidea:BWhyman-madechemicalsarestillusedinfarmingDetail:Organicfarmingisnowherenearbeingabletomeetthehighdemandforfoodaroundtheworld.TheyalsoplantcropsthatusedifferentdepthsofthesoiltohelpkeepitrichWhile-reading:Activity4Readthetextagainandcompletethetablebelowwiththehelpofthesignpostsinit.FarmingBenefitProblemSolutionChemicalfarmingOrganicfarmingWhile-reading:Activity4Signposts1.Introducetwocontrastingpointsorfacts:ononehand...;ontheotherhand...2.Addmoreinformation:moreover...;3.Explainorsupportapoint:forexample...;4.Stateaconclusion:hence...;5.Saysomethingthatcontrastswithwhathasjustbeensaid:nevertheless...;6.Giveyourownopinion:personally...;While-reading:Activity4ChemicalfarmingBenefit:fightcropdiseaseincreaseproduction(servethehighdemandforfoodaroundtheworld)1.pesticidesometimesharmlandandpeople’shealth`killhelpfulbacteriaandinsects`stayforalongtimeandaffectcrops,animalandpeople2.chemicalfertilizernotrichinnutritionandhavelessflavorProblem:Solution:SwitchtoorganicfarmingWhile-reading:Activity4OrganicfarmingBenefit:KeepsoilrichandfreefromdiseasethroughnaturalmeansnaturalwastefromanimalsasfertilizerchangethekindofcropineachfieldeveryyearplantdiversecropsusingdifferentdepthofsoilUnabletoservethehighdemandforfoodaroundtheworldProblem:Solution:Thereisstillalongwaytofindasuitablesolution.Post-reading:Activity1Discussion1.Istheauthorfororagainstorganicfarming?Howdoyouknow?2.Whatotherdisadvantagesoforganicfarmingcanyouthinkof?Post-reading:Activity11.Istheauthorfororagainstorganicfarming?Howdoyouknow?Objective,bothbenefitsandproblemsareexplained.Thereisalongwaytofindasuitablesolution.Butitisworththetimeandtheeffort.So,theauthorisfororganicfarming.Post-reading:Activity12.Whatotherdisadvantagesoforganicfarmingcanyouthinkof?HighercostofproducingfoodGreateffortsrequiredtofarmingPost-reading:Activity2Writeanessayshowingwhetheryousupportche