Using language高一英语必修4第2单元课件.ppt

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1、人教课标高一必修4Unit2Unit2WorkingthelandUsingLanguageWhatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.Whichkinddofarmersusewhentheyaredoingorganicfarming

2、?Doyouknowaboutorganicfarming?ORGANICFARMINGOrganicfarmingissimplyfarmingwithoutusinganychemicals.Scanthepassageandgetthemainideaofit.Chemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.1.Whyarechemicalfertilizerssopopularinfarmingtod

3、ay?Readthepassageandanswerthefollowingquestions.Theyareagreatwaytostopcropdiseaseandincreaseproduction.2.Whatproblemscanbecausedbyusingchemicalfertilizers?Theycandamagethelandbykillinghelpfulbacteriaandpestsandbystayinginthegroundandundergroundwaterforalongtim

4、e.Theydamagepeople’shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.3.Whatisorganicfarming?Organicfarmingmeansgrowingcropswithoutusinganychemicals.4.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsis

5、togrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.Readthepassagecarefullyandfillintheblanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease__________productionChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Dam

6、agingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆Foodgrowstoofasttobefullofmuch________.bacteriaandpestsnutritionOrganicfarming____Togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealthGoalOrganicfarmingMethods◆Using_____

7、__wastefromanimalsasfertilizer◆Changing______________ineachfieldeveryfewyears◆Using_____________ofsoiltoplantcrops◆Planting_____betweencropsgrassnaturalthekindofcropdifferentlevelsInwhatconditiondoyouthinkgreenfoodgrow?dirtyairdirtywatersuppliesinindustrialare

8、asmanychemicalfertilizersclean,freshaircleanwatersuppliesawayfromindustrialareasfreeofchemicalfertilizersProjectPersuadefarmerstogrowthecropsbyorganicfarmingwiththeknowledgelearnt.