必修四 UNIT 2 Using language.ppt

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1、人教课标版高一必修4Unit2ReadingonP14Whatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.Whichkinddofarmersusewhentheyaredoingorganicfarming?Doyouknow

2、aboutorganicfarming?ORGANICFARMINGOrganicfarmingissimplyfarmingwithoutusinganychemicals.1.Whyarechemicalfertilizerssopopularinfarmingtoday?I.Readthepassageandanswerthefollowingquestions.Theyareagreatwaytostopcropdiseaseandincreaseproduction.Comprehend

3、ing2.Whatproblemscanbecausedbyusingchemicalfertilizers?Theycandamagethelandbykillinghelpfulbacteriaandpestsandbystayinginthegroundandundergroundwaterforalongtime.Theydamagepeople’shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.3.Wha

4、tisorganicfarming?Organicfarmingmeansgrowingcropswithoutusinganychemicals.4.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.II.Readthetextandfi

5、llintheblanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease__________productionChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Damagingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆

6、Foodgrowstoofasttobefullofmuch________.bacteriaandpestsnutritionOrganicfarming____Togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealthGoalOrganicfarmingMethods◆Using_______wastefromanimalsasfertilizer◆Changing______________ineachfieldeveryfewy

7、ears◆Using_____________ofsoiltoplantcrops◆Planting_____betweencropsgrassnaturalthekindofcropdifferentlevelsInwhatconditiondoyouthinkgreenfoodgrow?Theadvantagesofgreenfooddirtyairdirtywatersuppliesinindustrialareasmanychemicalfertilizersclean,freshairc

8、leanwatersuppliesawayfromindustrialareasfreeofchemicalfertilizersMainideaofthepassageChemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.Long-termuseofchemicalfertilizerscancausedamagetothelandandpeople’shealth.Farmer