(共24张PPT)
Life will knock us down, but we can choose whether or not to stand back up.
生活会把我们打趴下， 但我们可以选择是否重新站起来。
Unit 2 Saving the Earth
Topic2 All these problems are very serious.
Section A
1. Learn Some words: sand, although ,sandstorm,desert,
reduce,completely;
Some phrases: change into, human being
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.
2. Talk about the sandstorm and its harm.
3. Use the indefinite pronoun and adverb.
Studying aims
many trees
cut down
forests gone
wash the earth away
冲走
change into desert
转换成，变成
沙漠
e.g. A lot of rich land has changed into desert because people have cut down too many trees.
sandstorms
come into being
n. 沙尘暴
3 Do you know how sandstorms come into being Number
the pictures and talk about the sandstorm 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
What’s the weather like in the picture What causes this kind of bad weather
1a Listen, look and say.
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.
√
Listen to 1a 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
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
Impotant sentences
1.The wind is blowing strongly.
2.People have cut down too many trees.
3.A lot of rich land has changed into desert.
4.Trees can stop the wind from blowing the earth away.
5.A lot of water can be saved by forests.
6.They can also stop the water from washing
the earth away.
7.Cutting down trees is harmful to human beings,animals and plants.
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
4 A. Listen to the passage and circle the phrases you hear.
become weaker
destroy the environment
disappear rapidly
on the earth
enough bamboo to eat
4 B. Listen again and fill in the blanks.
1. Now some kinds of animals are becoming
______ ______ _______.
2. Some animals are_____ ______ ____dying out
completely.
3. In the past, pandas lived a quiet life and had
________ ______food.
4. Humans have _____ _____ __________ the importance of protecting animals.
5. We should ______ ______ ____to protect them.
do our best
in danger of
plenty of
come to understand
fewer and fewer
somebody, someone, something, somewhere
anybody, anyone, anything, anywhere
none, nobody, nothing, nowhere
everybody, everyone, everything, everywhere
一般情况下用于肯定句
一般情况下用于否定句和疑问句
表否定含义
可用于各种句式
the indefinite pronoun and adverb
不定代词和副词
1.I have ____ to tell you.
A. important something
B. something important
B
形容词修饰不定代词和不定副词时，要放在不定代词/不定副词之后
Do you know
2.Everybody ___ ready for the match.
A. is B. are
A
不定代词作主语时，谓语动词要用单数。
下面的题你会做吗？
Everyone is in the hall, ___________
Everything goes well, ___________
aren’t they
在反义疑问句中，表示人的不定代词作主语时，其反义疑问句的主语通常用they；当句子中的主语是指物的不定代词时，其反义疑问句的主语通常是代词it。
doesn’t it
Lily, would you like ___________ to drink
Cindy is very busy now. She needs _______ to help her.
Is there _________ wrong with your computer
Jim looked for his pencil-box ____________ , but he didn’t find it.
I stayed at home last week. I didn’t go __________.
Use someone, something, anything, anywhere,everywhere to fill in the blanks.
something
someone
anything
everywhere
anywhere
While I was walking down the street just now, I couldn’t see _________.
We still need to do _________ to peotect the environment.
Use someone, something, anything, anywhere,everywhere to fill in the blanks.
anything
something
用所给词的适当形式填空。
1.The wind is blowing________（ strong） with lots of sand.
2.People have _____（ cut down） too many trees.
3.A lot of rich land has changed _____ desert.
4.Trees can stop the wind from___(blow) the earth away.
5.And a lot of water can be saved _____ forests.
6.They can also s____ the water from ______(wash)
the earth away.
7. _____（cut) down trees ____(be) harmful to human beings,animals and plants.
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
