Unit 2 Saving the earth. Topic 2 All these problems are very serious. Section A 课件 22张PPT

Unit 2 Saving the Earth
Topic 2 All these problems are very serious.
Section A
( 1a/1b/1c/2/3 )
All these problems are very serious.
sand
sandstorm
What bad weather !
The wind is so strong !
The wind blows strongly.
The sand really hurts people’s faces.
While we walk down the street,we can’t see anything.
What causes these sandstorms?
How do sandstorms come into being?
many trees
People have cut down too many trees. There are fewer trees left
cut down
forests gone
wash the earth away
冲走
change into desert
转换成，变成
沙漠
As a result, a lot of rich land has changed into desert because people have cut down too many trees.
Sandstorms come into being
Do you know how sandstorms come into being? Number
the pictures and talk about the sandstorms in groups.
( )
( )
( )
( )
( )
( )
4
1
5
3
6
2
wash the earth away
many trees
change into desert
forests gone
sandstorms come
into being
cut down trees
Cutting down trees is harmful to human beings,
animals and plants.
The reasons for sandstorms
How can that affect the weather?
1c Read 1a and complete trees’ functions.
Trees can stop the wind from blowing the earth away.
A lot of water can be saved by forests.
They can also stop the water from washing the earth away.
Tree’s functions
塞罕坝
Although we have built “The Green Great Wall”,we still need to do something to protect the environment.
K: wind; sand; anything
M: sandstorms
J: cut down; as a result; change into
M: affect
J: stop…from…; blow… away
K: can be saved
J: wash … away
K: is harmful to; although; do something
Read the dialog in groups and
find out the useful phrases
2 Complete the sentences with the correct forms of the given phrases in the box.
as a result, change into, do something,
stop…from, blow…away
1.People have cut down such a large number of trees that
the land _____________________desert.
2.There are fewer trees left, so the wind always _______
the earth ________.
3.Air pollution has become a serious problem, so we must
______________ to reduce it.
4.we should try our best to _________ people ________
cutting down the trees.
5.In the future, human beings can protect the trees well.
_____________, animals will live a happy life in the forest.
has changed into
blows
away
do something
stop
from
As a result
Oral Composition about
sandstorms
1.Describe the sandstorms.
2.How do sandstorms come into being?
3.What should we do to change the situation?
We learn: 1.Some words: sand, although
2.Some phrases: change into, human being
3.Some sentences:
(1)As a result, a lot of rich land has changed
into desert.
(2)Trees can stop the wind from blowing the
earth away.
We can: Talk about the sandstorm and its harm.
Summary
Lucid waters and lush mountains are invaluable assets

Homework
Read 1a.
Memorize the useful expressions and key sentences which we learn today.
Write a short passage about sandstorms
Thank you!