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(共16张PPT)
Unit 2 Saving the Earth
Topic 2 All these problems are very serious.
sandstorm
How does the sandstorm come into being
wash the earth away
many trees
change into desert
forests gone
sandstorms come into being
cut down trees
3. Number the pictures about how sandstorms come into being.
4
1
5
3
6
2
Once, there were many trees in the forests.
But people started to cut down trees.
soon, the forests were gone.
Without trees, wind and rain began to wash the earth away.
As a result, a lot of rich land has changed into desert.
Now, when the wind blows, sandstorms come into being.
There were fewer trees left, so the wind always blows the earth away.
People have cut down such a large number of trees that the land has changed into desert.
Task 1 Listening for gist
The boy and girls are talking about ______.
A. different types of sandstorms
B. the reasons for sandstorms
C. sandstorms in different cities

Task 2 Listening for details
facts The wind outside is blowing _________.
Kangkang saw ________ in sandstorms.
cause _______ cut down too many trees
result A lot of _____ land has changed into desert.
solution Built “ The _______ Great Wall”
strongly
nothing
People
rich
Green
Task 3 Listening for detailed comprehension
Trees can stop the _______ from blowing the earth away.
Trees can stop the _______ from washing the earth away.
A lot of water can be saved by _________.
wind
forests
water
(Kangkang,Maria and Jane are talking in a room. The wind outside is blowing strongly.)
Maria: What a strong wind!
Kangkang: Yes. But it’s better than the last few years. There were sandstorms before. While I was walking down the street, I couldn’t see anything. The sand really hurt my face.
Maria: Why was the weather so bad
Jane: People cut down too many trees. As a result, a lot of rich land changed into desert. Trees can stop the wind from blowing the earth away.
Kangkang: And a lot of water can be saved by forests.
Jane: Trees can also stop the water from washing the earth away.
Maria: Cutting down trees affects the weather so much.
Kangkang: Yes. It is harmful to human beings, animals and plants. Although there were sandstorms before, now we have built “The Green Great Wall”. Our environment has become much better.
肥沃的土地
刮得猛烈
cut down 砍伐，缩减
结果是
change… into= turn… into 把…变成
stop/ prevent/ keep… from doing sth. 阻止…做某事
blow away 吹/刮走
树木可以防风固土。
它们还能防止水土流失。
森林可以储存大量的水分。
人类
绿色长城
好大的凤啊！
Task 4 Post-listening: Listen 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.
in danger of
plenty of
come to understand
do our best
fewer and fewer
be in danger of doing sth. 处于做某事的危险中
die out 灭绝
很多的，大量的
…的重要性
do/ try one’s best to do sth. 尽某人最大的努力做某事
Task 5 Post-listening: 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
a number of + pl. + 谓复 许多；大量
the number of + n. + 谓单 …的数量
A number of my friends______ I should take a holiday. (think)
我的一些朋友认为我应该休假。
The number of students______about twenty. (be)
学生人数大约是20人左右。
the lungs of the earth
P49
Task 1 Reading for main idea
Para 1
Para 2
Para 3
The difficulties faced by tree-planting volunteers
The contribution and significance of Chinese volunteers
The importance of forests and the reason for deforestation
Forests help the Earth by removing _________________and making _________.
Countries like New Zealand, Canada, and Brazil cut down forests to ___________________________________.
Volunteers plant trees during their __________.
The difficulties volunteers face include bad weather, __________, and _________________________________.
Chinese volunteers use ____________________ to help plant more trees.
Task 2 Reading for detail
carbon dioxide
oxygen
provide wood to build houses
holidays
insects
dangerous mountains
new technologies
the lungs of the earth
functions
deforestation reasons
remove carbon dioxide
make oxygen
provide wood to build houses
1. Importance & threat
2. Volunteers’ difficulties
weather
insects (bite)
physical challenges
carry heavy bags of small trees
dangerous work in the mountains
3. Chinese volunteers’ role
methods
use new technologies
achievements & impact
plant millions of trees every year
make local government better
help the whole world
Forests are the lungs of the earth. Without them, it cannot breathe. It needs its forests to remove carbon dioxide from the air and to make oxygen. In many countries, such as New Zealand, Canada, and Brazil, forests were cut down to provide wood to build houses. Many volunteers around the world are working in their holidays to plant new trees to replace them.
They face many difficulties when planting new trees. The weather may be very hot and dry or it may be very cold and wet. There are often many insects that bite these planters on their legs, arms, and faces while they work. They carry heavy bags of small trees, and working in the mountains can be dangerous.
Chinese volunteers have helped plant lots of trees around the world. They have big plans to grow more forests and have used new technologies to reach their goals. By planting millions of trees every year, they are not only making their own environment better but also helping the whole world. This shows that Chinese really care about the earth.
remove…from… 从…移除
bite sb. on / in the+身体部位 （face, eye, chest, stomach用in; head, ear, shoulder, leg用on）
关心，在意
1. 猛烈地吹 ____________________
2. 砍倒 _____________________
3. 结果 _______________________
4. 肥沃的土地 ___________________
5. 变成 _________________
6. 阻止 _______________________________
7. 吹走 ___________________
8. 对...有害 ____________________________
9. 人类 ___________________________
10. 绿色长城 ______________________
blow strongly
cut down
as a result
rich land
change into
stop/ prevent/ keep ...from
blow ... away
be harmful to/ do harm to
human beings
the Green Great Wall
self-assessment
1. We were watching TV __________ the light went out.
2. ____________ we were watching TV, the light went out.
3. ___________________ she is a top student, she has some shortcoming.
4. He is tall and thin _________ I am short and heavy.
5. ____________ Margo was talking on the phone, her sister walked in.
6. Cindy was wearing a pink shirt __________ I saw him.
7. _________ the work is difficult, it was interesting.
8. Jenny is good at Chinese ________ Sam is good at English.
when
When/ While
While/ Though/ Although
while
When/ While
when
While
while
Thank you!

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