人教高中英语必修4Unit2Using-language-(共27张)课件.ppt--（课件中不含音视频）

1、 高中英语人教版 Book4 unit 2Using languageChemical or organic farming?AChemical fertilizersNatural fertilizersBNow,which one do you prefer?ABIts a product of organic farming.AIts a product of chemical farming.B1 To enable Ss to master the main idea of the text and know the ways of organic farming.2 To lear

2、n 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:Listen to the tape carefully and get the main idea of the passage.Step 1.Listening_fertilizers can cause many _,so _farming is becoming mo

3、re popular.Chemicalproblemsorganic 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.

4、P4.Step2.Fast Reading Part 1(Para.1-2)Chemical farming part 2(Para.3-4)Organic FarmingDivide the text into two parts.？Task1:Para 11 What advantages does chemical farming have?Chemical farming can stop crop disease and increase production.Step3.Careful reading2 Do you think it is really a great way?N

5、OTask2:Para.2 Read and fill in the form.bacteria and pestsnutritionlandpeoples healthcancer other illnessesTask3:Para.3 I True or False1.Organic farming means farming without using any chemicals.2.Organic farmers prefer using fertilizers to make the soil richer in minerals.3.Farmers want to keep the

6、ir soil fertile and free of disease.4.Organic farming would pollute the environment.natural waste from animalsnot TTFFII Questions1.What is organic farming?2.What are the advantages of using natural fertilizer?Organic farming is simply farming without using any chemicals1)Reduce diseases in crops an

7、d 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.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

8、 water free from chemicals.C.It can kill harmful pests.D.It can make the soil richer in mineral.CTask3:Para.42.The organic farmers do the followings except _.A.adding fertilizers which is rich in mineralB.changing crops every two or three yearsC.planting seeds in different layers of the soilD.planti

9、ng grass between crops to prevent the soil from being blown awayA 3 What methods do farmers use to keep the soil fertile?1)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.After reading,please t

10、ell me:1.Is it chemical or organic farming?2.How do you know?Situation 1:The farmer is using fertilizers to keep the vegetable free from pest.Chemical farmingStep4Situation 2:Lao Wang grows soybeans in his field last year and grows corns this year.organic farmingGrow different crops every year.Situa

11、tion 3:Lao Li throw the nitrogen fertilizer(氮肥氮肥)in his field to make his soil rich in minerals.Chemical farmingUse chemicalsSituation 4:Li Hua only use natural fertilizers to grow his cabbage.Thats why his cabbage is damaged by pests.Organic farming :Fill in the blanksOver the past half century che

12、mical 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 soil rich and free of disease.Organic farmers often pref

13、er using natural waste of animals asfertilizer.This keeps the soil free_chemicals.There _(be)many methods to keep the soil fertile.The methods have the same goal:to grow good food and avoid _(damage)the environment or peoples health.Step5.SummaryHoweverillnesseswithoutofdamagingareproductionto stoph

14、as becomebecauseLets find the advantages of Organic farming.Step6 Discussion 1.Better for the soil2.Better for the crops.3 Better for the water supply and environment.4 Better for our health.the advantages of Organic FarmingSelling your green food You are a producer of “green food.How to sell your“g

15、reen food?Work in pairs and make a dialogue.One is the farmer,the other is the customer.Step7 Role-playUseful sentence patterns:Farmer:Our food is fresh,natural Its healthy and safe for Its more expenstive but Youll taste the difference whenCustomer:Id like to I want to buy How much Whats the advantage of?Can you make it cheaper?Homework:Write an article about future farming.