仁爱科普版九年级上册Unit 2 Saving the earth. Topic 2 All these problems are very serious. SectionA 课件(共18张PPT

(共18张PPT)
Unit 2 Saving the Earth
Topic2 All these problems are very serious.
Section A
sandstorm
n.沙尘暴
How do sandstorms come into being How do sandstorms come into being
cut down
many trees
forests have gone
wash the earth away
冲走
change into desert
It’s a desert.
People deserted the houses.
n. 沙漠
v.废弃，遗弃
deserted houses
adj. 被遗弃的，无人居住的
change into
→
A lot of rich land has changed into desert.
We can change grapes into the wine.
Sandstorms come into being .
Do you know how sandstorms come into being Number
the pictures .
( )
( )
( )
( )
( )
( )
4
1
5
3
6
2
wash the earth away
many trees
change into desert
forests gone
sandstorms come
into being
cut down trees
The boy and girls are
talking about —————.
different types of sandstorms
the reasons for sandstorms
sandstorms in different cities
1b Listen to 1a and choose the best answer.
Focus on the main idea of the conversation when you listen for the first time.
√
read the conversation and answer the questions
1.What’s the weather like today
It’s bad. The wind is so strong . And the sand really
hurts face.
2.What causes these sandstorms
People have cut down too many trees.
As a result, a lot of rich land has changed into desert.
3.Do we still need to do something to protect the
environment
Yes, we do. Although we have built “The Green Great
Wall”, we still need to do something to protect the
environment .
conj. 虽然，尽管，即使
n.沙
Trees can stop the wind from blowing the earth away.
A lot of water can be saved by forests.
C They can also stop the water from washing the earth away.
Tree’s functions
Can you find out trees’functions according to the conversation
Trees can make the world more beautiful.
Trees can make air cleaner and fresher.
Forests give a lot of animals a home.
Trees can be made into desks, chairs, paper and so on.
Trees can make oxygen which is necessary for human beings.
Trees can make people comfortable and relaxed.
…
Can you think about other functions of trees
Ⅰ.important phrases
change into/ turn into
blow away/ wash away
take away/ run away
as a result /as a result of
stop…from doing
prevent… from doing
keep… from doing
Knowledge points:
Ⅱ .important sentences
1.And a lot of water can be saved by forests.
情态动词的被动语态：情态动词+be+过去分词
The school rules must be followed.
The trees should be protected.
2.Although we have built “the Green Great Wall”, we still need to do something to protect the environment.
although 引导让步状语从句，意为“尽管，即使”，可换为 though /even though, 其后句中不能出现but。
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: 1. Use the indefinite pronoun and adverb.
2.Talk about the sandstorm and its harm.
Summary
Read 1a.
Memorize the useful expressions and key sentences which we learn today.
Finish Section A in your workbook.
Preview Section B.
Thank you!