资源简介

(共36张PPT)
Unit
3
Oxford English
Module 2 Environmental problems
Period 1
Reading (I)
drought 干旱
flood 洪水
tsunamis 海啸
What can you see
We can see pollutions and natural disasters.
What’s your feeling
I am feeling …
The world is in danger
1
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
2. How many problems does the article discuss
What problems does the article discuss
The greenhouse effect, cutting down forests and bad habits.
Three.
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
Environmental problems.
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
greenhouse effect
What’s the result
What cause
是什么？
导致的结果？
What
什么导致？
Task 1 Read the first part of the text and answer three questions.
2
While you read
Reading Tips
在阅读每个段落时，要注意综合运用略读(skimming)与扫读(scanning)这两种方法。
通过略读把握文章大意
略读(skimming)只看文章标题、下标题以及每个部分或者段落第一行, 关注文章中反复出现的关键词。
略读时, 要用充足的时间读懂段落的第一句和第二句, 因为第一句往往是该段的主题句(topic sentence), 而第二句往往是对前句的延伸(extension)或进一步的解释(explanation)。
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.
什么是温室效应？(what)
温室效应(英文：Greenhouse effect)，又称“花房效应”，是大气保温效应的俗称。大气能使太阳短波辐射到达地面，但地表向外放出的长波热辐射线却被大气吸收，这样就使地表与低层大气温度增高，因其作用类似于栽培农作物的温室，故名温室效应。温室有两个特点：温度较室外高，不散热。
The atmosphere lets sunlight in but keeps heat from getting out.
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.
Because we burn fuels such as petrol and coal. We produce carbon dioxide （CO2 ）. Too much of CO2 pollutes the atmosphere and causes it to keep in（贮存） too much heat.
Cause：
The greenhouse effect can cause（导致）sea level to rise and may cause cities to disappear（消失）.
Result：
Cutting down forests
So we can’t make the greenhouse effect worse.
But we are doing something bad to make the greenhouse effect worse. Do you know what it is
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.
Task 2 Read the second part of the text and do the exercises.
Why does cutting down trees make the greenhouse effect worse
2. What are the results of cutting down forests
A. Because trees take in CO2 and produce O2.
B. Because trees take in O2 and produce CO2.
1. Why does cutting down trees make the greenhouse effect worse ( )
A
Cutting down trees can________ the homes of animals that live in forests.
destroy
砍树会摧毁住在森林里的动物的家园。
Cutting down trees ______ the surface of the soil to_________________ by rain.
causes
be easily destroyed
砍树导致土壤的表面很容易被雨摧毁。
Cutting down trees can________ floods.
result in
砍树可以导致水灾。
2. What are the results of cutting down forests
A. It destroys the homes of animals that live in forests.
B. It causes the surface of the soil to be easily destroyed by rain.
C. It can result in floods and even more damage to the environment.
D. All of the above.
D
So can we cut down trees
But some of us have bad habits which also cause pollution.
No, we can’t.
Throw away litter.
It’s a bad habit
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.
Task 3 Read the third part of the text and complete the diagram.
Cause
People often __________or__________
Effect 1
Effect 2
use things once and then throw them away
or leave them on the ground as litter.
This creates mountains of rubbish.
This pollutes our land and seas.
Topic sentence ______________________________ ____________________________________________________
The writer’s suggestions to become _________________
to _________________________
___________________________
to _____________________as we can (e.g. ____________________
________________________, ___
_______________________, etc.)
Conclusion We can __________________.
Task 4 Read the last part of the text and fill in the table.
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.
Reusable bag
Topic sentence ______________________________ ____________________________________________________
The writer’s suggestions to become _________________
to _________________________
___________________________
to _____________________as we can (e.g. ____________________
________________________, ___
_______________________, etc.)
Conclusion We can __________________.
In order to protect the environment, we need to take proper action.
“green consumers”
make a difference
Read the last part of the text and fill in the table.
buy and use products friendly to the environment
recycle as many things
reuse things for the same purpose as before
use things for new purposes
To be a green consumer：
1. I should save water.
2. I should plant more trees.
3.I should go to school on foot or by bike.
4. I should recycle as many things as I can.
5. I should turn off the lights when I leave the room.
6. I shouldn’t waste food.
7. I shouldn’t use plastic bags.
8. I shouldn’t use disposable chopsticks.
9. I shouldn’t play computer for a long time.
10. I shouldn’t throw rubbish here and there.
Promise(承诺书）
If everyone can do like these, I am sure the Earth will become more and more beautiful.
3
D1 Replace the italicized words with information from the article on page 35.
Comprehension
our world/the Earth
The atmosphere around the Earth
fuels such as petrol and coal
The increasing temperature
Cutting down trees
pollution
After you read
D2 Read the article again and circle the correct answers.
H
Homework
1. 模仿录音的语音、语调，朗读课文。
2. 划出课文中的重点单词和短语并带上汉语意思整理在笔记本上。(至少20个）
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. 完成课本第46页C1、C2的练习。

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