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2019-2020年高中英语unit2usinglanguage学案新人教版必修4Writedownthemainidea主要大意foreachparagragh.P
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1.Whatproblemsarecausedbyusingchemicalfertilizers
2.WhyarenaturalfertilizersbetterReadthetextcarefullyandfillintheblanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease________________ChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Damagingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆Foodgrowstoofasttobefullofmuch________.
3.WhatspecialwaysoffarmingdoorganicfarmersuseWhatspecialwaysorganicfarmersdoWhydosoUsenaturalfertilizers.Changecropseveryfewyears.Growcropsthatneeddifferentlevelsofthesoil.TrueTorFalseF.1.Organicfarmerspreferusingnaturalwastefromanimalsandchemicalfertilizers. 2.Usingnaturalwastemakesthesoilricherinmineralsandsomorefertile. 3.Usingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth. 4.Usingchemicalfertilizershasbeeverymoninfarmingoverthepasthalfcentury. 5.Chemicalfertilizersonlykillharmfulbacteriaandpests. Discussion:AdvantagesofgreenfoodTakenotes:*tastedelicious*grownin_________air*freeofp___________*_________nutrition*do_______topeople’shealthandthee___________SummaryWhatdowelearntoday___________________________________________________________。