Unit5UsingLanguageWriting课件高中英语人教版选择性2

EvaluatechemicalfarmingandorganicfarmingBook4Unit5UsinglanguageWarmingupandlead-inDoyouwanttohavealandofyourown?FreetalkWhatwillyougrowifyouhavealand?Warmingupandlead-inWhatwillyougrowifyouhavealand?FreetalkDoyouwanttohavealandofyourown?Warmingupandlead-inWhatwillyougrowifyouhavealand?FreetalkDoyouwanttohavealandofyourown?Whatisthesubstanceweputonthesoiltomakecropsgrow?chemicalfertilizersnaturalfertilizersWarmingupandlead-inWhatarethey?Doyouknowthedifference?FreetalkchemicalfertilizersnaturalfertilizersChemicalfarming

farmingusingchemicalpesticidesandartificialfertilizers.Organicfarmingsimplyfarmingwithoutusinganychemicals.Warmingupandlead-inWhatarethey?Doyouknowthedifference?FreetalkchemicalfertilizersnaturalfertilizersChemicalfarming

farmingusingchemicalpesticidesandartificialfertilizers.Organicfarmingsimplyfarmingwithoutusinganychemicals.ArgumentativeWritingWriteanargumentativeessaygivingyouropiniononchemicalororganicfarming.WritingtargetArgumentativewritingistoexpresstheauthor'sopinionsthrougharguingorreasoning.Theauthorwhoholdsaviewonacertainissueshouldputforwardseveralreasonsandsupportingevidencetopersuadeothersinordertomakereadersagreewiththeirownviews.Towritewell,weneedpayattentionto..1.Thetopic(论点)2.Argument(论据)3.Demonstration(论证)ArgumentativeWritingPre-readingPredictionVersusprep./ˈvɜːsəs/表示两队或双方对阵）对，诉，对抗1.Whatdoesthepictureshow?2.Whatwillbethetextabout?Pre-readingPrediction1.Whatdoesthepictureshow?2.Whatwillbethetextabout?Thefirstpictureshowsapersonisusingpesticidewhilethesecondisfulloffreshfruit.Theyeachrepresentchemicalandorganicfarming.Pre-readingPrediction1.Whatdoesthepictureshow?2.Whatwillbethetextabout?Perhapsitwillbeaboutchemicalfarmingandorganicfarming.ShortlybeforereadingExpectationWhatdoyoualreadyknow?Whatareyoueagertoknow?Whathaveyoulearnt?ShortlybeforereadingExpectationWhatdoyoualreadyknow?Whatareyoueagertoknow?Whathaveyoulearnt?ShortlybeforereadingExpectationWhatdoyoualreadyknow?Whatareyoueagertoknow?ShortlybeforereadingExpectationWhatdoyoualreadyknow?1.Chemicalfarmingiseconomical.2.Organicfoodisperhapshealthier.……3.Organicfoodismoreexpensive.4.Chemicalfarmingmightpolluteourenvironment.5.AnimalsmightbeindangerbecauseoftheuseofChemicalpesticide.6.Wecan’tstopusingchemicalsinfarmingcompletelynow.ShortlybeforereadingExpectationWhatdoyoualreadyknow?Whatareyoueagertoknow?c1.Whatisauthor’sattitudetowardsit?2.Whyischemicalfarmingnothealthy?….3.Whatisorganicfarming?4.Whichwayofgrowingfoodtastesbetter?5.Whataretheadvantagesoforganicfarming?6.Canorganicfarmingreplacechemicals?While-readingThetopicWhatisauthor’sattitudetowardsthetopic?Howdoyouknow?Findyourevidence.cIdentifyauthor’sopinionUsually,authorsexpresstheirattitudetowardsthetopicatthebeginningofthearticleandechotheiropinionsattheendofthearticle.While-readingThetopicWhatisauthor’sattitudetowardsthetopic?Howdoyouknow?Findyourevidence.Theauthorisagainstchemicalfarmingandworriedthatthelong-termuseofchemicalsmightharmthelandandpeople’shealth.While-readingThetopicWhatisauthor’sattitudetowardsthetopic?Howdoyouknow?Findyourevidence.

Theauthorisagainstchemicalfarmingandworriedthatthelong-termuseofchemicalsmightharmthelandandpeople’shealth.

Theauthorisworriedandhopesonedaypeoplecaneathealthierfoodtheenvironmentcanbecomebetter.While-readingArgumentThink:Howwillauthorexpresshisarguments?TheproblemswithchemicalfarmingWhatisorganicfarming?TheCharacteristicsoforganicfarmingWhile-readingArgumentTheproblemswithchemicalfarmingWhatisorganicfarming?1.Long-termuseofchemicalpesticidesandartificialfertilizerscanharmthelandandpeople’shealth.2.Pesticidescankillhelpfulbacteriaandinsects.3.Cropsgrownwithchemicalfertilisersusuallygrowtoofasttoberichinnutrition.Inwhichparagraphdidyoufindallthedetails?Para.1&2TheCharacteristicsoforganicfarmingWhile-readingArgumentTheproblemswithchemicalfarmingWhatisorganicfarming?TheCharacteristicsoforganicfarmingOrganicfarmingissimplyfarmingwithoutusinganychemicals.While-readingDemonstrationTheproblemswithchemicalfarmingWhatisorganicfarming?TheCharacteristicsoforganicfarmingOrganicfarmingissimplyfarmingwithoutusinganychemicals.1.Organicfarmersfarmthroughnaturalmeans.Manyusenaturalwastefromanimalsasfertilizers.2.Theyusemanymethodstoproducerichsoil.Theychangethekindofcropgrownineachfieldeveryyear.Theyplantdiversecropsthatusedifferentdepthsofsoil.Why?Becausetheyputimportantmineralsbackintotheground,makingitreadyforthenextbatchofcrops.Why?Becauseitcangrowgoodfoodwhileavoidingdamagetotheenvironmentortopeople’shealth.While-readingThefutureWhatisthefutureofmodernfarming?Willwecompletelystopchemicalfarming?While-readingThefutureWhatisthefutureofmodernfarming?Willorganicfarmingreplacechemicalfarming?While-readingThefutureWhatisthefutureofmodernfarming?Orwillorganicfarmingchemicalfarmingcoexist?While-readingThefutureWhatisthefutureofmodernfarming?Willman-madechemicalsbestillusedinfarming?Yes.Becausechemicalfarmingserveshighdemandforfoodaroundtheworldwhichorganicfarmingcannotprovideenoughforus.While-readingThefutureWhatisthefutureofmodernfarming?Willman-madechemicalsbestillusedinfarming?Yes.Becausechemicalfarmingserveshighdemandforfoodaroundtheworldwhichorganicfarmingcannotprovideenoughforus.Thereisstillalongwaytofindasolutionthatcanprovidesufficientfoodforuswhilekeepingbothpeopleandenvironmenthealthy!Post-readingSummary1.Summarizethemainideaofeachpart.WhatorganicfarmingisOrganicmethodsforproducingrichsoilTheproblemswithchemicalfarmingWhyman-madechemicalsarestillusedinfarmingPost-readingSummary2.Fillinthetableaccordingtothepassage.FarmingBenefitProblemSolutionChemicalfarmingOrganicfarmingfightcropdiseaseandincreaseproductionsometimesharmboththelandandpeople’shealthswitchtoorganicfarmingmakethesoilrich;keeptheair,soil,waterandcropsfreeofchemicalscannotmeettheneedstillalongwaytofindasuitablesolutionBefore-writingGroupworkDiscussthefollowingtwoquestionswithyourgroupmembers.1.Whatotherdisadvantagesofchemicalfarmingdidauthornotlist?2.Whatotherdisadvantagesoforganicfarmingcanyouthinkof?While-writingGroupworkDecidewhetheryourgroupsupportschemicalfarmingororganicfarming.Theuseyouroutlinetowriteashortessaygivingyouropiniononthetopic.Topicsentence:Inmyopinion,_______farmingispreferableto____________farmingbecause___________________Point1:_________________________________________（Detail）_________________________________Point2:_________________________________________（Detail）_________________________________Point3:_________________________________________

（Detail）_________________________________Conclusion:______________________________________明确体裁话题支持有机农业文体：议论文确定时态人称以现在时为主、兼顾过去时、将来时；第一、三人称布局文章结构开头：介绍农业发展概况和有机农业的出现。展开论述：分层次介绍化学农业和有机农业的区别，有机农业的优势。结尾：总结观点，提出建议。列出核心要点1.化学农业的缺点。2.有机农业的优点，人们对健康的重视和选择有机农业的理由。

明确体裁话题确定时态人称

布局文章架构

列出核心要点

Writeanargumentativeessay.开头：介绍农业发展概况和有机农业的出现。展开论述：分层次介绍化学农业和有机农业的区别，有机农业的优势。结尾：总结观点，提出建议。支持有机农业文体：议论文以现在时为主、兼顾过去时、将来时；第一、三人称1.化学农业的缺点。2.有机农业的优点，人们对健康的重视和选择有机农业的理由。After-writingCheckingLetgroupmembersreviewthedraftaccordingtothechecklist.Doesthegroupmemberdoagoodjobofexpressingyouropinion?Doeseachparagraphhaveonemainidea.Doeseachparagraphhaveatleastonedetailtosupportthemainidea?Doesthegroupmembersequencethepointsinalogicalorder?Doesthegroupmemberdoagoodjobpersuadingyoutoaccepthis/heropinion?After-writingPresentationInviteonegroupmembertopresentyourspeech.ApossibleversionSample

Inmyopinion,organicfarmingispreferabletochemicalfarmingbecauseofthebenefitstotheenvironmentastopeople,andbecauseorganicfoodismorenutritious. Tobeginwith,chemicalfarmingharmstheenvironment.Sincechemicalpesticidesarenotfoundinnature,normalnaturalprocessescannotgetridofthem.Instead,thechemicalstendtoaccumulateinthesoilandwater,andareabsorbedinthefoodchain,wheretheypoisonwildlifeanddomesticanimals.Thisaffectsusdirectly,becauseweendupeatingplants,dairyproducts,eggs,andmeatthathavehighlevelsofpesticides.Thinkaboutit:Thepurposeofthepesticidesistokill“pests”,thatis,tokillinsects. Somethingthatcankillaninsectprobablyisnothealthyforapersontoeat.While