人教版高中英语必修四unit2_Using_language_优质课课件.ppt

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1、Unit2WorkingthelandUsinglanguagegreenfoodorganicfoodChemicalOrOrganicFarming?ReadingRecently,however,scientisthavebeenfindingthatlong-termuseofthechemicalfertilizerscancausedamagetothelandand,evenmoredangerous,topeople’shealth.Whataresomeoftheproblemscausedbychemicalfertilizers?Fin

2、doutandunderlinethetopicsentencesofeachparagraph.Para1.Para2.SkimmingPara3.Para4.Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.Organicfarmersalsousemanyothermethodstokeepthesoilfertile.ScanningReadthepassage,andanswerthequestions.1.Howmanyproble

3、mscanbecausedbyusingchemicalfertilizers?2.Whataretheadvantagesoforganicfarming?3.Whichoneisn'tthemethodtokeepthesoilfertile?1.Howmanyproblemscanbecausedbyusingchemicalfertilizers?First,theycandamage…aswellas….Chemicalsalsostayinthe…and….Inaddition,…growtoofastto….Therearethreeprobl

4、ems.2.Whataretheadvantagesoforganicfarming?Thefarmers_______keepingtheirsoilrichandfreeofdiseaseand_______theair,soil,waterandcrops_________chemicals.focusonkeepingfreefrom3.Whichoneisn'tthemethodtokeepthesoilfertile?A.usingnaturalwastefromanimalsasfertilizer.B.changingthekindofcro

5、pineachfield.C.plantingcropstousethesamelevelofsoil.D.plantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil.para1.Anewdiscoveryofscientists.para2.Severalproblemscausedbyusingchemicalfertilizers.para3.Theadvantagesofusingorganicfarming.para4.Somemethodstokeepthesoilfe

6、rtile.ThestructureofthispassageTopic(presentsituation)ProblemsAdvantagesMethods(conclusion)Thetypeofthearticleis_____________exposition（说明文）Consolidation请以“PLASTICORCLOTHBAGS?”为题模仿这篇文章的篇章结构和句子结构去写一篇说明文。DiscussionandwritingDiscussionandwritingPlasticOrClothBags?Para1.Para2.Para3.Par

7、a4.Haveabriefillustrationofthepresentsituation.Theproblemscausedbyusingplasticbags.Theadvantagesofusingclothbags.Conclusion.Problemsofusingplasticbags1.causewhitepollution2.easytobebroken3.difficulttobreakdown4.doharmtotheenvironmentandpeople'shealthAdvantagesofusingclothbags1.canb

8、erecycledandreused2.savere