人教版高中英语必修四unit2-Using-language-优质课课件

1、2021/8/142021/8/142 green food organic food 2021/8/143Chemical Or Organic Farming?Reading2021/8/144Recently, however, scientist have beenfinding that long-term use of the chemical fertilizers can cause damage to the land and, even more dangerous, to peoples health.What are some of the problems cause

2、dby chemical fertilizers?Find out and underline the topic sentences of each paragraph.Para1.Para2.Skimming2021/8/145Para 3.Para 4.With these discoveries, some farmers and many customers are beginning to turn to organic farming. Organic farmers also use many other methods to keep the soil fertile. 20

3、21/8/146Scanning Read the passage,and answer the questions.1. How many problems can be caused by using chemical fertilizers?2. What are the advantages of organic farming?3. Which one isnt the method to keep the soil fertile? 2021/8/1471. How many problems can be caused by using chemical fertilizers?

4、 First, they can damage as well as . Chemicals also stay in the and . In addition, grow too fast to . There are three problems.2021/8/1482. What are the advantages of organic farming? The farmers _ keeping their soil rich and free of disease and _ the air , soil, water and crops _ chemicals.focus on

5、 keepingfree from2021/8/1493. Which one isnt the method to keep the soil fertile?A. using natural waste from animals as fertilizer. B. changing the kind of crop in each field .C. planting crops to use the same level of soil.D. planting grass between crops to prevent wind or water from carrying away

6、the soil. 2021/8/1410para1. A new discovery of scientists.para2. Several problems caused by using chemical fertilizers.para3. The advantages of using organic farming. para4. Some methods to keep the soil fertile.The structure of this passageTopic(present situation)ProblemsAdvantagesMethods(conclusio

7、n)The type of the article is_exposition（说明文）（说明文）Consolidation2021/8/1411请以请以“PLASTIC OR CLOTH BAGS?”PLASTIC OR CLOTH BAGS?”为题为题模仿模仿这篇文章的篇章结构和句子结构去这篇文章的篇章结构和句子结构去写一篇说明文。写一篇说明文。 Discussion and writing2021/8/1412Discussion and writingPlastic Or Cloth Bags?Para1.Para2.Para3.Para4. Have a brief illustra

8、tion of the present situation. The problems caused by using plastic bags. The advantages of using cloth bags. Conclusion.2021/8/1413Problems：1. cause white pollution2. easy to be broken3. difficult to break down4. do harm to the environment and peoples healthAdvantages：1. can be recycled and reused

9、2. save resources 3.cheap4. protect the environment2021/8/1414Over the past half century, have become very common . Recently, however, we have been finding that they can cause damage to .What are some of the problems caused by ? First,With these discoveries, are beginning to turn to .The following w

10、ords may help you.2021/8/1415Homework :Finish the writing .2021/8/1416 Over the past half century, plastic bags have become very common in our daily life. We welcomed them as a convenient way to carry goods. Recently, however, we have been finding that they can cause damage to the environment, even

11、worse, to peoples health.2021/8/1417 What are some of the problems caused by plastic bags? First of all, people often leave plastic bags here and there, making white pollution. Whats more, it takes a long time, more than 200 years, to break up . Last but not least, when heated, plastic bags can prod

12、uce something harmful, which can build up in our body and eventually lead to cancer or other illnesses.2021/8/1418 With these discoveries, we are beginning to turn to cloth bags. They can be used many times. People can save a lot of resources in this way. It is also a good idea to make some cloth bags by ourselves, which is i