Learning about Language教案和学案内容

必修四英语第二单元导学案

Unit 2

working the land

Using language

I. Pre-reading Answer some questions: 1. What is the substance we put on the soil to make crops grow?

2. How many kinds of fertilizers do farmers use?

II. Skimming

The main idea of this passage: This passage tells us something about _________ ________. It means growing crops without _________ _________which damage the soil. The organic farmers keep the soil _________ and ________ in several ways. III. Scanning Read the passage and answer the following questions. 1 Why are chemical fertilizers so popular in farming today?

2 What problems can be caused by using chemical fertilizers?

3 What is organic farming?

4 What is the main reason for using organic farming methods?

IV. Careful reading Find and write down the methods and advantages in the passage. Methods of organic farming Advantages of methods 1.Farmers use________ ________from 1 This makes the soil ________ in minerals animals. and so more _________. 2 Farmers often _________the kind of 2 Changing the crops ________ the minerals crop in each field every few years. in the soil and helps it become rich and healthy. 3 Farmers plant crops with ___________ 3 This uses different ________ of soil. lengths of roots.

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4 Farmers sometimes __________ 4 This prevents wind or water from __________between crops and leave it in ________ ________ soil and acts as a the ground. natural fertilizer. 二、language points 1. These chemicals in the food supply build up

in people’s bodies over time.

build up：________________________

e.g.

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

【活学活用】

(1)发展体育运动，增强人民体质。

Promote the development of sports and _________ ________ the people's health. (2)看到你的词汇量在逐渐增大，我很高兴。

I'm very glad to see that your vocabulary ________ ___________ _________ ________.

2. This also keeps the air, soil, water and crops free from chemicals. keeps… free from /of: ________________________________

e.g.We put our books in bookcase to keep them free from dust. You must take care to keep the wound free from the dirt. [拓展] 1)keep …

from: ________________________________

如：

He won’t be able to keep the truth from his father.

You can’t keep him from doing that thing.

2)free from: ________________________________

如：

They aim to free the students from too much homework. 3)be free of sb/sth: ________________________________如：

I’m free of that job at last.

3. 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造成土地受损，甚至更危险的是，会对人们的健康造成危害。

have been finding是_____________时。现在完成进行时表示一个动作开始于过去，持续到现在，并强调现在还在进行。

eg: (1) John has been painting the ceiling.约翰一直在粉刷天花板。

(2) Because of illness，he has been lying in bed all day.由于生病，他整天都躺在床上。

【活学活用】

1．(2009年浙江卷)Over the past decades，sea ice ________ in the Arctic as a result of global warming. A．had decreased

B．decreased

C．has been decreasing

D．is decreasing 2. —I’m sure Andrew will win the first prize in the final.

—I think so. He ________ for it for months. A．is preparing

B．was preparing

C．had been preparing

D．has been preparing 3. —I have got a headache. —No wonder. You ________ in front of that computer too long. A．

work

B．are working

C．have been working

D．worked 4．They ________ on the program for almost one week before I joined them，and now we ________ it as no good results have come out so far. A．had been working；are still working

B．had worked；were still working C．have been working；have worked

D．have worked；are still working

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