Topic 2 All these problems are very serious. SectionA（22张ppt）课件- 2024-2025学年仁爱版英语九年级上册

(共22张PPT)
Unit 2
Saving the Earth
Topic 2
Section A
1.学习目标
3.重点探究
2.自主学习
学习导航
5.当堂检测
6.课堂总结
4.拓展提升
新课导入
Let's watch a video ...
学习目标
1.能熟悉并正确运用本课时的重点单词和短语
2.初步掌握不定代词的用法
3.进一步了解有关环境污染的一些情况，提高
环境保护意识
自主学习
Key words
sandstorm n. 沙暴
sand n. 沙
change into 转化成，变成
desert n. 沙漠
v. 舍弃，遗弃
human being n. 人
although conj. 虽然，尽管，即使
reduce v. 减少；减轻
completely adv. 彻底地；完整地
重点探究
1a Listen, look and say.
(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 the 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.
1b Listen to 1a and choose the best answer.
The boy and girls are talking about _______.
different types of sandstorms
the reasons for sandstorms
sandstorms in different cities
Focus on the main idea of the conversation when you listen for the first time.
√
After listening and answer the questions.
1.What was the weather like before
There were sandstorms before.
2.What causes these sandstorms
People cut down too many trees. As a result, a lot of rich land
changed into desert.
3.What have we done to protect the environment
We have built “The Green Great Wall”.
1c Read 1a and complete trees’ functions.
Trees’ functions
A.
B. A lot of water can be saved by forests.
C.
Trees can stop the wind from blowing the earth away.
They can also stop the water from washing the earth away.
Tips:
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
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.
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
changed into
blows
away
do something
stop
from
As a result
3 Do you know how sandstorms come into being Number
the pictures and talk about the sandstorm in groups.
wash the earth away
many trees
change into desert
forests gone
sandstorms come into being
cut down trees
1
2
3
4
5
6
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
拓展提升
Language points
1. change into... 变成……
e.g. Water has changed into steam.
水变成了蒸气。
2. stop/prevent sb./sth. (from) doing sth.
阻止某人/某物做某事，from可以省略。
e.g.
The heavy snow stopped/prevented the visitors (from) leaving the top of the mountain.
大雪使游人不得不停留在山顶上。
3. earth着重指与天空相对的“土地”，还泛指泥土；soil要指用于种植庄稼的“土壤”；ground主要指大地表面；land着重指与河、湖、海洋相对的陆地。
e.g.
Put the tree in the hole and fill it with earth again.
把树放进坑里，然后用土重新将坑填满。
Light, water, air and soil are essential to plant life.
光、水分、空气和土壤对植物生长是不可缺少的。
The bag fell on the ground.
那个包掉到地上了。
A lot of good lands have gone.
大片的良田消失了。
4. although conj.意为“虽然，尽管”，引导让步状语从句，相当于though, although较正式。
e.g.
Although/Though he is very tired，he goes on with his work.
虽然他很累，但他还继续工作。
He helped us, although he didn’t know us.
尽管他不认识我们，但他帮助了我们。
注意：在句中使用although或though时，不能与but同时使用，但although/though后可用yet 或still等。
由some/any/every/no + body /thing/one/where构成.
1.不定代词作主语，谓语动词用三单形式。
2.形容词修饰不定代词放其后。
3.something 用于肯定句/疑问句中;anything 用于否定句或疑问句中。
一、不定代词（副词）的构成：
e.g. something
二、不定代词的用法:
Nobody likes to be untidy.
I have something important to tell you.
I have something important to tell you.
I don’t have anything important to tell you.
不定代词/副词
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
1.If you don’t pay for the bill , they will _______ the electricity supply.
2.Trees can stop the wind _______ the earth _______.
3.Heavy rain will __________ the soil soon if there is no trees.
4.We should plant more trees after we ______ some _______.
当堂检测
cut off
从方框中选出合适的短语并用适当形式填空。
cut… down, cut off, blow… away, wash away
blowing away
wash away
cut down
课堂总结
Unit 2
Topic 2 Section A
初步掌握不定代词的用法
进一步了解有关环境污染的一些情况，提高环境保护意识