人教高中英語必修4Unit2Using language 共27張

1、Step1 Lead-in,Food is the first necessity of the people,民以食為天,吃動(dòng)物怕激素；吃植物怕毒素,喝飲料怕色素；能吃什么，心里沒數(shù),全國(guó)人大代表,金志國(guó),帶到兩會(huì)上的順口溜,1.Why did he say so,民以食為,天,民以食為,憂,As customers , what kind,of food shall we buy,Which one do you prefer,A,B,A,Chemical fertilizers,化肥,B,Natural fertilizers,Natural waste from animals and

2、 dead plants,Its a product of,organic farming,Its a product of,chemical farming,B,A,Step2 Words preview,1,化肥,2,對(duì),造成損害,3,洗掉某物,4,逐漸增強(qiáng),建立,5,導(dǎo)致,造成,后果,6,另外,還有,7,集中,注意力、精力,于,8,使,免受,影響,9,每隔幾年,10,避免做,chemical fertilizers,cause damage to,wash off,build up,lead to,in addition,focus on,keepfree from,every few

3、years,avoid doing,1)Prediction(title,and picture,Main idea of the passage,This passage may tell us something,about,_,Step3 Skimming,chemical and organic farming,P14,Long-term use of chemical fertilizers,can cause,damage to the land and,peoples health,Farmers and customers turn to,organic farming,Oth

4、er methods to keep the soil fertile,Problems caused,by chemical fertilizers,Para1,Para2,Para3,Para4,2,Match the main idea of each paragraph,Para 1. Read and answer,Ask,What advantages does,chemical farming have,Chemical farming can,stop,crop disease,and,increase,production,Step4. Careful reading,Ans

5、wer,Para. 2 Read and fill in the form,The disadvantages,of Chemical,Farming,How,1,Damaging the,_,Killing the helpful,_,2. Damaging,_,1. Many chemicals,in the,food supply,can lead to,_or_,2. Food grows too fast to,be full of much _,bacteria and pests,nutrition,land,Peoples health,cancer other illness

6、es,1. What is organic farming,It means,growing crops,without using,any chemicals,2. What kind of fertilizer do organic,farmers use,They use natural waste from animals,Para 3. Read and answer,Changing the kind of,crop in each field,every few years,Planting crops with,different lengths of,roots,1. To

7、use different levels,of soil,3. To renew the minerals,in the soil and help it,become rich,Planting grass,between crops and,leave it in the ground,2.To prevent wind or water,from carrying away soil,and act as a natural,fertilizer,Methods,Purposes,Para.4 1,Match each method with its purpose,Ask,What i

8、s the goal of using organic,farming methods,to grow _ and avoid _,the environment or peoples health,Para.4 2,Read and answer,Answer,These many different organic,farming methods have the same goal,good food,damaging,Listen and fill in the blanks,After reading, please tell me,1,Is it chemical or organ

9、ic farming,2,How do you know,Step5. Guessing,Organic farming,Chemical farming,Situation 1,The farmer is using pesticides to,keep,the vegetable,free from,pest,殺蟲劑,Situation 2,Li Hua only use natural fertilizers to,grow his greens. Thats why his,greens are damaged by pests,Step6 Oral Practice,Ask and

10、answer,Answer,Yes, scientists have found that long,term use of these fertilizers can cause damage to,the land, even more dangerous, to peoples,health,Para1,科學(xué)家們已經(jīng)發(fā)現(xiàn)使用化學(xué)肥料的不良,影響了嗎,什么問句？時(shí)態(tài),Ask,_,scientists _ the harmful,effects of using chemical fertilizers,Task1: Finish the question,Have,found,Ask: _

11、,are caused by using,chemical fertilizers,Answer,There are several problems caused by,chemical fertilizers. They damage the land by,killing bacteria and pests and even peoples,health by building up in peoples bodies,使用化學(xué)肥料導(dǎo)致了哪些問題,Para2 Task1: Finish the question,What problems,Answer1,With these disc

12、overies, some farmers,and many customers are beginning to turn to,organic farming,1,農(nóng)民和顧客開始轉(zhuǎn)向哪種耕種方式，有機(jī)耕種還是化學(xué),耕種,Ask2: _,is organic farming,2,什么是有機(jī)耕種,Ask1: _,do farmers and customers,begin to turn to, organic farming or chenmical,farming ,Para3 Task1,Finish the questions,Answer2,Organic farming is si

13、mply farming,without using any chemicals,Which farming,What,Answer1,Organic farmers use many methods to,keep the soil fertile,Para4 Task1,Finish the questions,1,有機(jī)耕種的農(nóng)民使用了什么方法來保持土壤肥,沃,Ask1: _,do organic farmers use to,keep the soil fertile,2,使用這些有機(jī)耕種方法的目標(biāo)是什么,Ask2: _,of using these organic,farming me

14、thods ,Answer2,The goal of using these organic farming,methods is to grow good food and avoiding,damaging the environment or peoples health,What methods,What is the goal,Step6 Oral Practice,Task2: Ask and answer the,questions with your partner,Step7,Assignment,writing,a summary,Step1 Write the main idea