人教版高中英語必修四unit2Usinglanguage優(yōu)質(zhì)課課件谷風(fēng)教學(xué)

1、沐風(fēng)教育# green food organic food 2沐風(fēng)教育#chemical or organic farming?reading3沐風(fēng)教育#recently, 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 causedby chemical fertilize

2、rs?find out and underline the topic sentences of each paragraph.para1.para2.skimming4沐風(fēng)教育#para 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. 5沐風(fēng)教育#scanning read the pass

3、age,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? 6沐風(fēng)教育#1. how many problems can be caused by using chemical fertilizers? first, they can damage as well as

4、 . chemicals also stay in the and . in addition, grow too fast to . there are three problems.7沐風(fēng)教育#2. 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 keepingfree from8沐風(fēng)教育#3. which one is

5、nt 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 the soil. 9沐風(fēng)教育#para1. a new discovery of

6、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(conclusion)the type of the article is_exposition（說明文）（說明

7、文）consolidation10沐風(fēng)教育#請(qǐng)以請(qǐng)以“plastic or cloth bags?”“plastic or cloth bags?”為題為題模仿模仿這篇文章的篇章結(jié)構(gòu)和句子結(jié)構(gòu)去這篇文章的篇章結(jié)構(gòu)和句子結(jié)構(gòu)去寫一篇說明文。寫一篇說明文。 discussion and writing11沐風(fēng)教育#discussion and writingplastic or cloth bags?para1.para2.para3.para4. have a brief illustration of the present situation. the problems caused by

8、using plastic bags. the advantages of using cloth bags. conclusion.12沐風(fēng)教育#problems：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 2. save resources 3.cheap4. protect the environment13沐風(fēng)教育#

9、over 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 words may help you.14沐風(fēng)教育#homework :finish the writing .15沐風(fēng)教育#

10、 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 worse, to peoples health.16沐風(fēng)教育# what are some of the problems caused

11、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 produce something harmful, which can build up in our body and eventually lead to cancer or other illnesses.17沐風(fēng)教育# 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 oursel