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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,高中英语人教版,Book4 unit 2,Using language,Chemical or or,g,anic farming?,Unit 2,高中英语人教版 Book4 un,A,Chemical fertilizers,Natural fertilizers,B,AChemical fertilizersNatural f,Now,which one do you prefer?,A,B,Why?,Now,which one do you prefer?A,Its a product of,organic farming,.,A,Its a product of,chemical farming,.,B,Its a product of organic farm,1 To enable Ss to master the main idea of the text and know the ways of organic farming.,2 To learn the advantages of organic farming.,3 To let Ss become aware of advertising the safety and importance of scientific farming and eating organic food.,Learning aims:,1 To enable Ss to master the,Listen to the tape carefully,and get the main idea of the passage,.,Step 1.Listening,_fertilizers can cause many _,so _farming is becoming more popular.,Chemical,problems,organic,Listen to the tape carefully a,Match the main idea of each paragraph.,B.Long-term use of chemical fertilizers can harm the land and peoples health.,D.Farmers and customers turn to organic farming.,C.Organic farming methods to keep the soil fertile.,A.Problems caused by chemical fertilizers.,P1.,P2.,P3.,P4.,Step2.,Fast Reading,Match the main idea of each,Part 1(Para.1-2),Chemical farming,part 2(Para.3-4),Organic Farming,Divide the text into,two,parts.,？,？,Part 1(Para.1-2)Divide th,Task1:Para 1,1 What advantages does chemical farming have?,Chemical farming can stop crop disease and increase production.,Step3.,Careful reading,2 Do you think it is really a great way?,NO,Task1:Para 11 What advantages,Task2:Para.2 Read and fill in the form.,bacteria and pests,nutrition,land,peoples health,cancer other illnesses,Task2:Para.2 Read and fill i,Task3:Para.3 I True or False,Organic farming means farming without using any chemicals.,Organic farmers prefer using fertilizers to make the soil richer in minerals.,Farmers want to keep their soil fertile and free of disease.,Organic farming would pollute the environment.,natural waste from animals,not,T,T,F,F,Task3:Para.3 I True or Fals,II Questions,1.What is organic farming?,2.What are the advantages of using natural fertilizer?,Organic farming is simply farming without using,any chemicals,1)Reduce diseases,in crops and help them grow strong and healthy.,2)Make the soil richer,in minerals and so more fertile.,3)Keep,the air,soil,water and crops,free from,chemicals.,II QuestionsOrganic farming is,1,.Which is not the reason why organic,farmers prefer natural waste from,animals?,A.It can keep the food free from,chemicals.,B.It can keep the air,soil and water,free from chemicals.,C.It can kill harmful pests.,D.It can make the soil richer in,mineral.,C,Task3:Para.4,1.Which is not the reason why,2,.The organic farmers do the followings,except _.,A.adding fertilizers which is rich in mineral,B.changing crops every two or three years,C.planting seeds in different layers of the soil,D.planting grass between crops to prevent,the soil from being blown away,A,2.The organic farmers do the,3 What methods do farmers use to keep the soil,fertile?,Change the kind of crop in each field,every few years.,2)Plant crops to use different levels of soil.,3)Plant grass between crops and leave it,in the ground.,3 What methods do farmers use,After reading,please tell me:,1.Is it chemical or organic farming?2.How do you know?,After reading,please tell me:,Situation 1:,The farmer is using fertilizers to keep the vegetable free from pest.,Chemical farming,Step4,Situation 1:Chemical farmingS,Situation 2:,Lao Wang grows soybeans in his field last year and grows corns this year.,organic farming,Grow different crops every year.,Situation 2:organic farmingGr,Situation 3:,Lao Li throw the nitrogen fertilizer(,氮肥,)in his field to make his soil rich in minerals.,Chemical farming,Use chemicals,Situation 3:Chemical farmingU,Situation 4:,Li Hua only use natural fertilizers to grow his cabbage.Thats why his cabbage is damaged by pests.,Organic farming,Situation 4:Organic farming,:,Fill in the blanks,Over the past half century,chemical,fertilizer,_(become),very common in farming _it is a,great way,_(,stop,),crop disease and increase,_(product)._,these,chemical can,lead,to,peoples_,(,ill,),farmers began to turn,to,organic,farming,_using any chemicals.,They,focus,on keeping,their,s,oil,rich and,free,of disease.Organic farmers often prefer using,natural,waste of animals asfertilizer.This keeps,the soil,free,_,chemicals.There,_(be)m,any,methods,to keep the soil,fertile,.,The methods have the same goal:,to grow good food,and avoid,_,(,damag,e),the,environment,or,peoples health.,Step5.Summary,However,illnesses,without,of,damaging,are,production,to stop,has become,because,Lets find the advantages of,Organic farming.,Step6 Discussion,Lets find the advantages of S,1.Better for the soil,2.Better for the crops,.,3 Better for the water supply and environment.,4 Better for our health.,the advantages of Or
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