高中英语人教版必修四教学案：Unit 2 Section 4 含答案

Ⅰ．Read the passage quickly and complete the following questions．

1．Match each part with its main idea．

Part 1 (Para．1)A．Farmers and customers turn to organic farming and how

farmerskeep their soil rich．

Part 2 (Para．2) B．Scientists have found that chemical fertilizers cause damage

to the land and people's health．

Part 3 (Paras．3&4) C．Some of the problems caused by chemical fertilizers．

答案：Part 1—B Part 2—C Part 3—A

2．What does the passage tell us?

Since chemical fertilizers have caused damage,_farmers have turned to organic_farming,_using natural_waste to keep the soil rich．

Ⅱ．Read the passage carefully and choose the best answers．

1．From the passage, we can see organic farmers are those who ________．

A．grow crops with chemical fertilizers

B．grow crops with natural fertilizers

C．produce organic fertilizers

D．care for the environment

2．From the fourth paragraph, we know that ________．

A．it's not good to plant grass between crops

B．peanuts use the ground's surface

C．peas and soybeans should be grown together with corn and wheat

D．vegetables that put down deep roots are harmful to the soil

3．According to the text, which of the following is NOT the problem caused by chemical fertilizers?

A．Crop diseases can be stopped．

B．Chemicals stay in the ground and underground water for a long time．

C．The helpful bacteria and pests are killed as well as the harmful ones．

D．Many of these chemicals are dangerous to people's health．

答案：1～3BBA

Ⅰ．单词拼写

1．The number of people suffering from heart disease will be greatly reduced (减少) if they are persuaded to eat more fruit and vegetables．

2．The focus (焦点) of public health is prevention and protection rather than treatment．3．The spokesman refused to comment (评论) on the matter．

4．All the mistakes in the exam have been underlined (画底线标出) in red ink．

5．Bacteria (细菌) are very small living things, some of which cause illness or disease．6．Good nutrition (营养) is essential if patients are to make a quick recovery．

7．It is important for you to skim (浏览) through the text．

Ⅱ．拓展词汇

1．confuse v t．使迷惑；使为难→confused adj．困惑的；烦恼的→confusing

adj．令人困惑的→confusion n．困惑；混乱

2．regret v t．遗憾；惋惜n．遗憾；懊悔→regretful adj．遗憾的；后悔的→

regretfully ad v．遗憾地；痛惜地

3．chemical adj．化学的；关于化学的→chemistry n．化学

4．mineral n．矿物；矿石→mine n．矿；矿山

5．production n．生产；制造→produce v t．生产；制造→producer n．生产者；制片人6．discovery n．发现；发觉→discover v t．发现→discoverer n．发现者

7．summary n．总结；摘要；概要→summarize v t．总结；概括

[巧记单词]

Ⅲ．补全短语

1．(be) in need of需要

2．cause damage to给……造成损害

3．wash off将……洗掉；洗净

4．build up逐渐增强；建立；开发

5．lead to导致；造成(后果)

6．in addition 另外

7．focus on集中(注意力、精力等)于

8．keep ．．．free from/of使……免受(影响、伤害等)；

使……不含(有害物)

1．[教材原句]Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land and, even more dangerous, to people's health．然而，最近科学家发现长期使用这些肥料会对土地造成损害，甚至更危险的是，会对人们的健康造成危害。

[句型点拨]现在完成进行时表示从过去发生的谓语动作一直持续到现在，强调动作的持续性。

[佳句赏析]The Grade Two classes have been observing the plants around the school and finding the animals that live there．

二年级各班的学生在学校周边观察植物和寻找小动物。

2．[教材原句]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．像豌豆或大豆这样的农作物能使土壤重新富含重要的矿物质，这为种植需要肥沃土壤的农作物，如小麦和玉米等做好了准备。

[句型点拨]现在分词短语在句中作结果状语。

[佳句赏析](2013·天津高考满分作文) On the other hand, I will help set up the English corner, providing us students a platform to practice our oral English．

另一方面，我将帮着建立英语角，提供给我们学生一个练习英语口语的平台。

CHEMICAL OR ORGANIC FARMING?

Over the past half century, using chemical fertilizers has become very common in farming．Many farmers welcomed them as a great way to stop crop disease and increase production．Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land and, even more dangerous, to people's health．

What are some of the problems caused by chemical fertilizers? First, they damage the land by killing the helpful bacteria and pests as well as the harmful ones．Chemicals also stay in the