(共21张PPT)
Unit 2 Saving the Earth
Topic2 All these problems are very serious.
Section B
（歌曲1）
Which color do you like best Why
Which color can make you the most relaxed
What can trees do for us
What can trees do for us
Our life
Our environment
What will our world be like without trees
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
4
1
5
3
6
2
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.
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 from pouring waste water into rivers.
Bye-bye!
（歌曲2）
