chemical or oganic farming 导学案

Unit 2 Working the land --Chemical or Organic Farming?

编写人：刘晓 编号： 3 班级： 小组： 姓名：

Section 3 Using language

【学习目标】

1.通过对文章的认真阅读，理解chemical farming 和organic farming的区别。

2.通过自主学习、合作探究，掌握课文中重点短语、理解长难句型。

【预习案】从课文中找出以下单词和短语。

1)化肥2) 细菌3). adj.化学的4n.生产

5n.发现6工业的7）.n. 营养，食物 8）v减少，缩减9）.n. 总结，摘要10）评论，议论

11）…造成损害12).

13). 导致;造成(后果);通往14).逐渐增强,堆积，建立

15).另外(还有)16).…免受(影响); 使…不含(有害物)

17). 集中(注意力、精力)于18). 每隔几年

避免做…20幸亏，由于21.对……感到满意

22对……感到困惑23 后悔做了某事

24.……25. 对……做出评论

26(Vt.使迷惑) adj. （adj.迷惑的；为难的）

27.vt./n. adj. adv. 后

悔地；遗憾地）28. (n.发现、发觉)- （vt. 发现）

29.adj.化学的n.n.化学家、（n.化学）

30.n.生产、制造） v.生产、制造）- n.产品、产物）

31营养adj.有营养的32.总结、摘要 （vt.总结、概括）

【探究案】

Step 1: Warming up

1. Have you ever been to the countryside? 2. Do you know how to work on a farm?

3. If you are a landowner, you want to grow some kinds of crops, what will you do?

Step II Reading

Task 1 Scanning

1. What is organic farming?

2. What is chemical farming?

3. What is the goal of using organic farming methods?

Task 2 Skimming

Find out the main idea of these four paragraphs. Match the lines.

P.1 Other methods to keep the soil fertile

P.2 Farmers and customers turn to organic farming.

P.3 Problems caused by chemical fertilizers

P.4 Long-term use of chemical fertilizers can cause damage to the land

and people s health.

Main idea of the passage.

cause many problems, so _______________is

becoming more popular.

Task 3 Careful reading

1. Read the second paragraph and answer the following questions

What problems can be caused by using chemical fertilizers? In other words,what s the

disadvantages of chemical fertilizers?

2. Read the third paragraph and write down the advantages of organic farming.

Task 4 Summary

Fill in the blanks according to the passage.

In recent days, scientists have discovered that using________ fertilizers for a

long time can hurt the land and also people's _______. There are several __________

caused by chemical fertilizers. They hurt the health of the land,_____ in the water for

a long time and get into people's ________ through their food. ________ farming is

becoming more popular with some farmers and many _________ after these

discoveries came out. Organic farming does not use any chemicals. There are many

organic farming_________ for making the land healthy and productive. All of these

methods try to produce good food and to keep the _____________and people

________.

Step III Language points in the passage

1. These chemicals in the food supply build up in people s bodies over time.

build up 增强; 建立；开发

Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。

He built up his strength again after an illness.他病后逐步恢复体力。

2. Many of these chemicals can lead to cancer or other illnesses.

lead to: 导致；造成(后果）

Too much work and too little rest often lead to illness. 过量的工作和过少的休息会引起疾病。

All roads lead to Rome. 条条大道通罗马。

[即学即练] 用lead to的适当形式完成句子。

（1）. Students should always remember that hard work is the main way which

________ success.

（2）. The bad weather ________ a terrible accident a few days ago.

[联想] result in引起(某种结果)、使获得(某种成果)、结果……。如：

The accident resulted in two deaths.

result from由……造成、因……而产生。如：

Sickness sometimes results from eating too much.

含介词to的东侧短语：

come to 来到，苏醒refer to 参考， 涉及look forward to 盼望

pay attention to 注意stick to 坚持devote to 致力于

turn to 求助于get close to 靠近

3. They focus on keeping their soil rich and free of disease.

focus on:集中(注意力，精力等）于

Focus on life.focus one s attention on 集中注意力于

focus one s mind on 把心思集中到……上

You should focus your attention on your work.你应该把注意力集中在你的工作上。

He needs to focus more on his career. 他需要更集中于他的事业。

4. reduce vt. 减少，减缩

They have to reduce expenses this year.他们今年必须削减开支。

搭配reduce to 减到，降到reduce by 减了， 降了

Please reduce______ 2% off the invoice price.

The water will freeze when the thermograph reduces _____ zero centigrade.

5. This also keeps the air, soil, water and crops free from chemicals.

这样还可以让空气、土壤、水以及农作物不受化学物质的污染。

keep… free from/of…使……免受(影响/伤害等)

Exercise can keep us free from disease. 锻炼能使我们摆脱疾病。

The United Nation is trying to keep the world free from the threat of war.

联合国正试图使世界免受战争的威胁。

6. Crops such as peas or soybeans put important minerals back into the soil, making it

ready for crops such as wheat or corn that need rich and fertile soil.

[分析] ①本句结构比较复杂。其主干结构为: 主句________________________

+ 结果状语_______________________________________

②状语中 make 的宾语是________, 指代________, ready for crops such as wheat

or corn 作_______________成分， that need rich and fertile soil 作___________

成分。

7. Some organic farmers prefer planting grass between crops to prevent wind or water

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