chemical or organic farming 有机还是化学种植.ppt

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1、ChemicalOrOrganicFarming?ReadingWhatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.Task1Skimming（3mins）Findoutthemainideaofthesefourparagraphs.Long-termuseofch

2、emicalfertilizerscancausedamagetothelandandpeople’shealth.Problemscausedbychemicalfertilizers.P1.P2.Farmersandcustomersturntoorganicfarming.Othermethodstokeepthesoilfertile.P3.P4.chemicalfertilizersWhyarechemicalfertilizerssopopularinfarmingtoday?Manyfarmerswelcomedthema

3、sagreatwaytostopcropdiseaseandincreaseproduction.Paragraph1Tips:theusageofseveraladverbsmeansclearandreasonableconnectionbetweenparts.Task1Scanning合成肥料Whatproblemscanbecausedbyusingchemicalfertilizers?Therearethreeproblems.First,theycandamage…aswellas….Theyalsostayinthe…

4、and….Inaddition,…growtoofastto….Tips:connectives（过渡词）andtransitionalphrases（过渡词）fordevelopmentfirst;second;finally;lastbutnotleast,etc.1.Whatisorganicfarming?2.Whataretheadvantagesoforganicfarming?1.Organicfarmingmeansgrowingcropswithoutusinganychemicals.Haha,we'veturned

5、toorganicfarming.Paragraph32.Whataretheadvantagesoforganicfarming?Thefarmersfocusonkeepingtheirsoilrichandfreeofdiseaseandkeepingtheair,soil,waterandcropsfreefromchemicals.Paragraph3Themethodstokeepthesoilfertileusingnaturalwastefromanimalsasfertilizer.changingthekindofc

6、ropineachfield.plantingcropstousedifferentlevelsofsoil.plantinggrassbetweencropstoprevent…Thesamegoal:____________________________________________________________________________________________togrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.Paragraph3and4

7、1234Focuson;leadto;problem;keep…freefrom;method;organic;chemical;causedamageto;buildup;discoveryInrecentdays,scientistshavediscoveredthatusingchemicalfertilizersforalongtimecan_________________thelandandalsopeople'shealth.Thereareseveral__________causedbychemicalfertiliz

8、ers.Theydamagetheland,stayinthewaterforalongtimewhichcan___________inpeople’sFillintheblanksaccordingto