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Unit 2 Saving the Earth
Topic 2 All these problems are very serious.
Section A
掌握重点词汇和短语：
sand, although, sandstorm, desert, human being, reduce, completely, change into, stop … from, blow/ wash … away, as a result等。
2. 能听懂谈论沙尘暴成因的对话。能够从所听材料中获得有效的细节信息。
3. 掌握动名词做主语，“防止...做...”的几种表达。
4. 通过课文的学习，让学生了解沙尘暴形成的原因和过程，关注全球的环境问题。
Learning aims:
Do you know how sandstorms come into being
wash the earth away
many trees
change into desert
forests gone
sandstorms come into being
cut down trees
Pre-listening
The forests have gone and the rain washes the earth away. Then there is a sandstorm.
wash away 把...冲走
sandstorm ['s ndst :m] n.沙尘暴
拓展：blow away 把...吹走
rainstorm 暴风雨 snowstorm 暴风雪
This land has changed into desert because people have cut down too many trees on it.
desert //d 'z t/ n. 沙漠/d 'z :t/ v. 舍弃，遗弃
区分：dessert [d z rt] n. 甜点
New words
1.sand [s nd] n. 沙
2.sandstorm [ s ndst :m] n. 沙暴
3.change into 转换成，变成（turn into)
4.desert [ dez t] n. 沙漠 v. 舍弃，遗弃
5.human being 人
6.although [ :l u] conj. 虽然，尽管，即使
7.reduce [r dju:s] v. 减少，减轻
沙暴
人
转换成
减少
彻底的
沙漠
虽然
沙子
While-listening
1b
Focus on the main idea of the conversation when you listen for the first time.
The boy and girls are talking about .
different types of sandstorms
the reasons for sandstorms
sandstorms in different cities
Listen to 1a and choose the best answer.
1c
Read 1a and complete trees’ functions.
Tree’s functions
________________________________
A lot of water can be saved by forests.
________________________________
Trees can stop the wind from blowing
the earth away.
They can also stop the water from
washing the earth away.
教考衔接
1. What is the weather like It’s _______.The wind is blowing strongly.
2. What causes these sandstorms People have______ ______ too many trees.
3. How can trees affect the weather (1)Trees can _____ the wind_____ blowing the earth away.
(2) A lot of water can _____ ______by forests.
(3) Trees can prevent the water from ______ the earth ______.
bad
cut
down
stop
from
be
saved
washing
away
Listen to 1a again and fill in the table.
Group work. Read 1a and find the phrases.
3.变成
change into = turn into
4.阻止某人做某事
stop sb. from doing sth
1.砍到
5.吹...走
6.冲走
7.许多
8.形成、开始、产生
cut down
blow away
wash away
a number of...
come into being
2.结果
as a result
10.灭绝、消失
die out
9.处于...的危险
in danger of
12.尽某人最大努力做某事
try one’s best to do sth
11.大量
plenty
Look, listen and say.
1a
What a strong wind!
(Kangkang, Maria and Jane are talking in a room. The wind outside is blowing strongly.)
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.
Why was the weather so bad
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.
a. What+形容词+不可数名词/可数名词复数！
b. What+ a/an+形容词+可数名词单数！
as a result 结果是 as a result of 由于
change into 转换成、变成
cut down 意为“砍倒、削减”
考点1
拓展
cut up 意为“切碎”
cut off 意为“切断、中断”
cut out 意为“删除、删去、剪下”
cut in 意为“插嘴”
考点2
stop sb/sth (from) doing sth 意为“阻止某人/某物做某事”
=prevent/discourage sb/sth (from) doing sth
拓展
keep sb/sth from doing sth 意为“阻止某人/某物做某事”
from不能省略。
keep sb/sth doing sth 意为“使某人/某物一直做某事”
And a lot of water can be saved by forests.
Trees can also stop the water from washing the earth away.
Cutting down trees affects the weather so much.
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.
take away “拿走”
put away “把...收起来”
throw away “扔掉”
be saved by 被...所保存
被动语态，结构为be +done+by
cutting down 动名词做主语，谓语动词用单数
although=though=even though 虽然，尽管。不与but, however 连用，但常与yet, still 连用。
Post-listening
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
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
考点1
a number of 意为“许多、大量”= some 后面接名词复数或集合名词，谓语动词用复数。
a lagre number of 许多、大量 a small number of 少量
区别
the number of 意为“...的数量、数目” 后面接名词复数谓语动词用单数。 用what’s 来提问，用large/small来修饰。
考点2
die out 意为“灭绝、灭亡、逐渐消失”
拓展
die off 意为“相继死去”
die from意为“因（受伤、意外事故等外部原因）而死亡”
die of意为“因（疾病、饥饿、情感等内部原因）而死亡”
die away意为“（声音等）逐渐减弱”
Exercises
用所给词汇的适当形式或根据汉语提示填空。
1. The name of the little __________ is Tim. It was ________ in 2023
in Russia. (bear)
2. My pet cat is _________ out because of some diseases. The ________ of it will make me very sad. (die)
3. Please be _________ when taking _______ of the little girl. (care)
4. The Chinese dishes in this restaurant smells __________ and
sells ________. (good)
5. Some __________ animals such as snakes are also in _________. (danger)
6. I have forgotten the name of the movie ___________ (complete) .
bear
born
dying
death
careful
care
good
well
dangerous
danger
completely
课后实践作业
小组调查
分组调查我们所学的灾害，完成一篇调查短文，每组派代表进行全班展示。注意现在完成时的正确使用。
Name What kinds of disasters have you found？ What problems has the disaster brought us？ What have we done to solve it？
Summary
We learn:
We can:
1. Some words: sand, although, sandstorm, desert, human being, reduce, completely...
2. Some phrases: change into, stop … from, blow/ wash … away, as a result…
3. Some sentences:
As a result, a lot of rich land changed into desert.
A lot of water can be saved by forests.
Trees can also stop the water from washing the earth away.
1. Use the indefinite pronoun and adverb.
2. Talk about the sandstorm and its harm.
Homework
1. Recite the new words and phrases by heart.
2. Recite the dialog in 1a.
3. Finish Section A in the workbook.
4. Preview Section B.

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