Using LanguageⅡ名师教学视频（文字实录）

幻灯片1 人教课标 高一

必修 4 Unit 2 幻灯片2 Unit

2

Working

the

land

幻灯片3 Using

Language

幻灯片4

What do farmers usually put on the soil to make crops grow fast ?

Fertilizers.

幻灯片5 How many kinds of fertilizers do farmers use?

And what are they?

There are two kinds. They are chemical fertilizers and natural ones.

幻灯片6

Chemical fertilizers

幻灯片7

Natural fertilizers

Natural waste from animals and dead plants

幻灯片8 Now, which one do you prefer? a product of

chemical farming

A

a product of

organic farming

幻灯片9

B

幻灯片10



幻灯片11

green food

organic food

幻灯片12 Pre-reading

1.Do you know what is organic farming?

2.Which kind of fertilizer do farmers use when they are doing organic farming, chemical fertilizers or natural fertilizers ?

幻灯片13

Reading Chemical Or Organic Farming? 幻灯片14 1. Scan the passage and get the main idea of it. The ____________ between _________ farming and __________ farming. comparison chemical organic 2.

Find

out

and

underline

the

topic

sentence of each paragraph. 幻灯片15 Skimming Find

out

and

underline

the

topic

sentence

of each paragraph. Recently, however, scientists have been finding that long-term use of

the

chemical fertilizers can cause damage

to the land and, even more dangerous,

to people’s health. Para1. What are some of the problems caused by chemical fertilizers? Para2. 幻灯片16

With these discoveries, some farmers

and many customers are beginning to

turn to organic farming. Para 3. Para 4.

Organic farmers also use many other methods to keep the soil fertile. 幻灯片17

Answer the following questions (Exercise1, P14)



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?

5. How many methods are listed to keep the soil fertile?

What are they? 幻灯片18 Read the passage and answer the

following questions. 1. Why are chemical fertilizers so popular in farming today? They are a great way to stop crop disease and increase production. 幻灯片19 2. What problems can be caused by using chemical fertilizers?

First, they can damage the land by killing the helpful bacteria and pests.

They also stay in the ground, build up in people’s bodies and lead to cancer or other illnesses.

In addition, it usually grows too fast to be full of nutrition. 幻灯片20 3. What is organic farming?

Organic farming means growing crops without using any chemicals. 幻灯片21 4. What is the main reason for using organic farming methods?

The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or people’s health.

幻灯片22 5. How many methods are listed to keep the soil fertile?

What are they?

Four. 1. Using natural waste from animals as fertilizer.

2. Changing the kind of crop in each field every few years. 3. Planting crops to use different levels of soil. 4. Planting grass between

crops to prevent…

幻灯片23 In what condition do you think green food grow? dirty

air

dirty water supplies

in industrial areas

many chemical fertilizers clean, fresh clean away from free of 幻灯片24

In recent days, scientists ______________(discover) that using chemical fertilizers

for a long time can be ______(harm) to the land and also to people's health. There are several problems _______(cause) by chemical fertilizers. They damage the land and stay in the water for a long time, _______ can build up in people's bodies and lead to many _________(ill). Therefore, organic farming is becoming ___________ (popular) with some farmers. They don't use any chemicals and focus on _______(keep) the soil rich. This also keeps the air and crops free____chemicals. There are many other methods to make the land healthy and productive. All of these methods have ____ same goal: to grow good food and avoid _________(damage) the environment or our health. have discovered harmful caused which illnesses more popular keeping from /of the damaging 幻灯片25 Project Persuade farmers to grow the crops by organic farming with the knowledge learnt.

*Problems caused by chemical fertilizers *What is organic farming?

*What fertilizer should they use? Why?

...... 幻灯片26

Reading



幻灯片27

Discussion and writing

请以“PLASTIC OR CLOTH BAGS?”为题模仿这篇文章的篇章结构和句子结构去写一篇说明文。

幻灯片28 Discussion and writing Plastic Or Cloth Bags?

Para1. Para2. Para3. Para4.

Have a brief illustration of the present situation.

The problems caused by using plastic bags.

The advantages of using cloth bags.

Conclusion. 幻灯片29 Problems：

1. cause white pollution 2. easy to

be broken 3. difficult to break down 4. do harm to the environment

and people's health

Advantages：

1. can be recycled and reused

2. save resources

3.cheap 4. protect the environment

幻灯片30 The following words may help you.

Over the past half century, …have become very common ….

Recently, however, we have been finding that they can cause damage to ….

幻灯片31

Homework : Finish the writing . Thank

you

for

attention！

幻灯片32

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 people’s health. 幻灯片33

What are some of the problems caused by plastic bags? First of all, people often leave plastic bags here and there, making white pollution. What’s 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. 幻灯片34

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 ourselves, which is interesting and cheap.

Let’s use cloth bags in our daily life instead of plastic bags, not only for the environment protection, but also for the sake of our health.

幻灯片35 Homework

Collect some information about the safety and importance of green food. 幻灯片36