必修四unit2-Using-language

1、Unit 2Working the landUsing languageWords previewchemicalproductionbacteriapestnutritionadj. 化学的化学的; 关于化学的关于化学的n. 生产生产; 制造制造n. 细菌细菌n. 害虫害虫; 害兽害兽; 害鸟害鸟n. 营养营养; 滋养滋养; 食物食物mineraldiscovery focussoilreducerootn. 矿物矿物; 矿石矿石n. 发现发现; 发觉发觉n. 焦点焦点; 中心点中心点vt. 集中集中; 聚焦聚焦n. 土壤土壤vt. 减少减少; 减缩减缩n. 根根; 根源根源 Express

2、ions preview build up lead to focus on keep free from/ of逐渐增强逐渐增强; 建立建立; 开发开发导致导致; 造成造成 (后果后果) 集中集中 (注意力注意力, 精力等精力等) 于于使使免受免受(影响影响, 伤害等伤害等)；使使不含不含(有害物有害物) green food organic foodAlthough they look , they may contain/tasteChemical Or Organic Farming?ReadingRecently . finding that long-term use of the

3、 chemical fertilizers can cause damage to the land and, even more dangerous, to peoples health.What are some of the problems caused by chemical fertilizers?Underline the topic sentences of each paragraph.Para1.Para2.Para 3. Para 4.With these discoveries, some farmers and many customers are beginning

4、 to turn to organic farming. Organic farmers also use many other methods to keep the soil fertile. A new discovery of scientists.Problems caused by using chemical fertilizers.The advantages of organic farming. Methods to keep the soil fertile.Para1.1. What is the new discovery?They welcomed them as

5、a great way to stop crop disease and increase production.A new discovery of scientists.2. Why did many farmers welcome chemical fertilizers?Long-term use of the chemical fertilizers can cause damage to the land and, even more dangerous, to peoples health.First, Chemical fertilizers damage the land b

6、y killing the helpful bacteria and pests.Chemicals also stay in the ground and underground water for a long time.Chemicals in the food supply build up in peoples bodies; they can lead to cancer or other illnesses.In addition, food grown with chemical fertilizers grow too fast to be full of much nutr

7、ition.4problemsPara2.Problems caused by using chemical fertilizers.Para 3.The advantages of organic farming. 1. What is “organic farming”? Organic farming is simply farming without using any chemicals.The farmers _ keeping their soil rich and free of disease.focus onA healthy soil _ disease and help

8、s crops grow strong and healthy.reduces2.What do organic farmers do?Why do so? (advantages of organic farming)2.This also _ the air , soil, water and crops _ chemicals.keepsfree fromPara 3.1.To make the soil richer in_and so more_They often _ using natural fertilizersprefermineralsfertile1. Change c

9、rops every few yearsCorn, wheatPeas, soybeansPut the minerals back into the soil, making it rich and healthy.Crops that use the surface of the soil (peanuts)Crops that need a deeper level of soil (root vegetable)3. Plant grass between crops to prevent wind or water from carrying away the soil, and t

10、hen leaving it in the ground to become a natural fertilizer.Para 4.Three methods to keep the soil fertile.2. Plant crops to use different levels of soilChemical farming Cause damage to the landKill both helpful and harmful bacteria and pestsCrops grow unhealthyOrganic farming Natural waste from anim

11、alsMake the soil richer in minerals and more fertileReduce diseases in cropsHelp crops grow strong and healthypara1. A new discovery of scientists.para2. Problems caused by using chemical fertilizers.para3. The advantages of organic farming. para4. Some methods to keep the soil fertile.The structure

12、 of this passageTopic(present situation)ProblemsAdvantagesMethods(conclusion)The type of the article is_exposition（说明文）（说明文）A exposition（说明（说明文）文） B argumentation (议论文议论文)C narration (记叙文记叙文)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。 Discu

13、ssion and writingDiscussion and writingPlastic Or Cloth Bags?Para1.Para2.Para3.Para4.Give a brief description of the present situation. The problems caused by using plastic bags. The advantages of using cloth bags. Conclusion.Problems：1. cause white pollution2. easy to be broken3. difficult to break

14、 down4. do harm to the environment and peoples healthAdvantages：1. can be recycled and reused 2. save resources 3.cheap4. protect the environmentOver 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

15、caused by ? First, Whats more. In addition.With these discoveries, are beginning to turn to .The following words may help you.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. sav

16、e resources 3.cheap4. protect the environment 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.

17、 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 produce something harmful, which can build up in our body and eventually lead to cancer or other illnesses. With these discoveries, we are beginning to turn to cloth bags. They can be used many times. People can save a lot of resources