Unit2 Saving the Earth Topic2 All these problems are very serious. Section B （歌曲 1 ） 福建省南安市毓元中学 黄仁份

Which color do you like best? Why? Which color can make you the most relaxed?

What can trees do for us?

Our life Our environment

What will our world be like without trees?

sandstorm desert human beings

What should we do ? We should stop from cutting down trees. We should prevent people from cutting down trees.

Listen to 1a, answer the questions. What are they talking about? What causes this kind of bad weather? They are talking about sandstorms. People have cut down too many trees. A lot of rich land has changed into desert. （录音 1 ）

Read 1a, answer the question. What are trees’ functions? Trees can stop the wind from blowing the earth away. A lot of water can be saved by forests. Trees can also prevent the water from washing the earth away. A. （影片） B. C.

Look at the picture, describe them using the words given. wash the earth away

Look at the picture, describe them using the words given. many trees

Look at the picture, describe them using the words given. change into desert

Look at the picture, describe them using the words given. forests gone

Look at the picture, describe them using the words given. sandstorms come into being

Look at the pictures, describe them using the words given. cut down trees

Number the pictures and then talk about them in groups. ( ) Do you know how sandstorms come into being?

Trees are very useful to us. They can help us p_____ the wind from blowing the earth away and stop the s_______ from moving towards the rich land. Trees also s________ water from running away. They can keep a great d______ of water. So we must stop people from c______ down too many trees. Otherwise a lot of rich land will change into d_______, l_______ only sand. We must get rid of ( 摆脱 ) this kind of bad b______. 根据句意及首字母提示完成句子。 revent and ave eal utting esert eaving ehavior

Trees are important to us, what can we do to protect them? We should prevent people from …

Protecting and Saving Water Water is very important to human beings, but not everybody knows how to protect and save it. Here are some ways: 1. Pass laws against water pollution. 2. Stop factories pouring waste water into rivers. 3. Remember to turn the tap off when you leave. 4. Collect and reuse waste water.... Read and discuss different ways of protecting and saving water. （录音 2 ）

Useful expressions The wind is blowing strongly with lots of sand. People have cut down too many trees. A lot of rich land has changed into desert. And a lot of water can be saved by forests. They can also prevent the water from washing the earth away. Stop factories pouring waste water into rivers.

Bye-bye! （歌曲 2 ）