Module 2 Unit 3 The environment：Period 1课件＋音频（共19张ppt)沪教牛津版九年级下册

(共19张PPT)
九年级 下册
教学课件
Unit
3
Oxford English
Module 2 Environmental problems
Period 1
Getting ready
Reading (I)
Getting ready
1
Look at the cartoon and answer the questions.
What has Lo done
What did Hi tell Lo to do
Does Lo understand what Hi meant
What did Hi mean when he told Lo to be greener
What should a person do if he or she wants to be green
He has painted himself green.
He told Lo to be greener.
No, he doesn’t.
He meant that Lo should care more about the environment.
2
What do you know about …
atmosphere
What do you know about the greenhouse effect
A1 What do you know about the greenhouse effect Match the first half of the sentences in column A with the second half in column B. Write the correct letters in the blanks.
e
f
b
d
c
a
The gases cause the atmosphere to keep in too much heat from the Sun.
The Earth is getting warmer and warmer.
We call this the greenhouse effect.
There is an atmosphere around the Earth.
It controls the Earth’s temperature.
However, we are polluting the Earth with harmful gases.
1
2
3
4
5
6
Read the following sentences.
Read the sentences in A1 and answer the questions.
1 What’s around the Earth
2 What are people polluting the Earth with
3 What are the effects of the harmful gases
4 What do we call this
The atmosphere.
Harmful gases.
They cause the atmosphere to keep in too much heat from
the Sun, and the Earth is becoming warmer and warmer.
The greenhouse effect.
A2 What is the result of the greenhouse effect In groups, discuss this with your
classmates.
3
Before you read
Look at the article on page 35 and choose the best answer.
The article is probably from a(n) ______.
a advertisement
b poster about the Earth Hour
c environmental science book
d comic book
c
Look at the pictures, the title, the introduction and the sub-headings of the article on page 35. Then answer the questions below.
1 What is the article mainly about
2 What problems does the article discuss
3 A consumer is someone who buys and uses things. Can you guess what a “green consumer” is
Environmental problems.
The greenhouse effect, cutting down forests and bad habits.
A “green consumer” is someone who only buys and uses things friendly to the environment.
Think and answer
What does a green consumer usually do
The world is ______________.
Main problem 1: _______________
Main problem 2: _______________
Main problem 3: ______________
Solution: We need to _____ ____________.
Read the text and finish the chart.
in danger
The greenhouse effect
The greenhouse effect
Cutting down forests
Bad habits
take
proper action
Part 1
Part 2
Part 3
Part 4
d
Match each picture with each part of the text.
a
b
c
e
4
While you read
Why must people do something to protect the environment
What are the main problems people face
What should people do to protect the environment
Read the text and answer the questions.
Because our world is in danger.
The greenhouse effect, cutting down forests and bad habits.
People should become “green consumers”.
5
C1 The words in italics explain the meanings of some words on page 35. Find these words to complete the sentences. Change their forms if necessary.
Vocabulary
As a result of
increase
sea level
surface
mountains of
The world is in danger
Our world is in danger. We must do something to protect the environment. But, what are the main problems we face
The greenhouse effect
The atmosphere around the Earth is necessary for all living things. It is like the glass of a greenhouse, letting sunlight in and keeping heat from getting out. Without it, the Earth would be the same as the Moon—cold and lifeless.
When we burn fuels such as petrol and coal, we produce a gas called carbon dioxide (CO2). Too much of this gas pollutes the atmosphere, and causes it to keep in too much heat. As a result of the greenhouse effect, the Earth’s temperature is increasing. This causes sea level to rise, and in the future may cause cities to disappear.
Cutting down forests
Every year, we destroy nature by cutting down huge areas of forests. This makes the greenhouse effect worse because trees take in CO2 and produce oxygen. Cutting down trees also destroys the homes of the animals that live in our forests, and causes the surface of the soil to be easily destroyed by rain. This can result in floods and even more damage to the environment.
6
Read after the recording
Bad habits
Many of our habits cause pollution. People often use things once and then throw them away, or leave them on the ground as litter. This creates mountains of rubbish and pollutes our land and seas.
In order to protect the environment, we need to take proper action. We should be different from many consumers and become “green consumers”. This means that we should only buy and use products friendly to the environment. We should also recycle as many things as we can. We can reuse things for
the same purpose as before, or we can use them for new purposes. If we just learn to live in new and different ways, we can make a difference.
H
Homework
1. 模仿录音的语音、语调，朗读课文。
2. 抄写单词和短语: atmosphere，temperature，consumer，guess，green，result，increase，sea level，surface，habit，proper；greenhouse effect，in danger，as a result of， mountains of，take action。
３. 根据课堂上完成的结构图简单描述目前地球面临的问题及其导致的严重后果。
4. 完成《练习册》第41页Reading A的练习。
THANKS