资源简介

(共44张PPT)
Unit 3 The environment
Period 1 Reading
下
（沪教牛津版）九年级
Learning objectives
1
Lead in
Pre-reading
3
While-reading
Post-reading
5
Practice
Summary
7
Assessment
2
4
6
8
Homework
9
By the end of the lesson, I will be able to ...
1
2
3
Master the basic usage of some words and phrases;
Understand the main content of the article, understand the details of the article;
Pay attention to environmental issues and establish environmental protection awareness.
Learning objectives
01
Lead in
02
Watch the video and know about the greenhouse effect.
greenhouse effect 温室效应
Pre-reading
03
What can you see in this picture
atmosphere / tm sf (r)/ n. 大气层
heat /hi t/ n. 热量
What can you learn from the picture
Pre-reading
03
A
1 There is an atmosphere
2 It controls
3 However, we are polluting
4 The gases cause the
atmosphere
5 The Earth is getting
6 We call this
B
______ a the greenhouse effect.
______ b the Earth with harmful gases.
______ c warmer and warmer
______ d to keep in too much heat
from the Sun.
______ e around the Earth.
______ f the Earth’s temperature.
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.
1
4
5
3
6
2
temperature / tempr t (r)/ n. 温度
harmful gases 有害气体
cause v. 导致
There is an atmosphere around the Earth.
It controls the Earth’s temperature.
However, we are polluting the Earth with harmful gases.
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.
Let’s read!
Pre-reading
03
A2 What is the result of the greenhouse effect In groups, discuss this with your classmates.
CO2 and other gases in the atmosphere trap heat, keeping the earth warm.
Some sunlight that hits the earth is reflected.
Some becomes heat.
atmosphere
Pre-reading
03
Look at the pictures, the title, the introduction and the sub-headings of the article on page 35. Then answer the questions below.
Pre-reading
03
Look at the pictures, the title, the introduction and the sub-headings of the article on page 35. Then answer the questions below.
Environmental problems.
1. What is the article mainly about
2. What problems does the article discuss
The greenhouse effect, cutting down forests and bad habits.
Pre-reading
03
Look at the pictures, the title, the introduction and the sub-headings of the article on page 35. Then answer the questions below.
3. A consumer is someone who buys and uses things.
Can you guess what a “green consumer” is
consumer n. 消费者
guess v. 猜测
A “green consumer” is someone who only buys and uses things friendly to the environment.
定语从句
形容词短语做后置定语
While-reading
04
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.
Listen and read the article.
lifeless / la fl s/ adj. 无生命的；无生物生长的
in danger 在危险中； danger n. 危险
in danger of 有……的危险
dangerous adj. 危险的
While-reading
04
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.
Listen and read the article.
fuel / fju l/ n. 燃料
result 结果
coal /k l/ n. 煤
sea level / si levl/ n. 海平面
increase / n kri s/ v. 增加
cause sb/sth. to do ... 导致；引起
as a result of 由于（后接表示原因的名词或代词）
as a result 结果；因此（后接表示结果的句子，一般用逗号隔开）
While-reading
04
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.
destroy 摧毁
soil /k l/ n. 土壤
flood /fl d/ n. 洪水
result in 造成；导致
nature 自然界；大自然
surface /k l/ n. 表面
even + 形容词比较级
While-reading
04
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.
mountains of 许多；大量,后接可数名词和不可数名词
a lot of / lots of 许多，后面接可数名词或不可数名词；
a large number of 大量，后面接可数名词;
a great deal of 大量，后面接不可数名词。
habit / h b t/ n. 习惯
While-reading
04
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.
propper / pr p (r)/ n. 正确的；恰当的
make a difference 有作用；有影响
purpose / p p s/ n. 目的；用途
recycle / ri sa kl/ n. 回收利用
friendly / frendli/ adj. 无害的
take action 采取行动
While-reading
04
( )Too much CO2 pollutes the atmosphere.
( )Cities may disappear.
( )Sea level rises.
( )The atmosphere keeps in too much heat.
( )The greenhouse effect takes place—the Earth’s temperature increases.
( )People burn fuels such as petrol and coal and produce a lot of CO2.
2
6
5
3
4
1
Read the first part and make the following sentences into correct order.
While-reading
04
Read the second part and fill in the blanks.
cutting down
worse
soil
floods
While-reading
04
Read the third part and talk about it according to the following pictures.
Please think: What should we do
While-reading
04
1. The article is probably from a(n) _______.
A. advertisement B. poster about the Earth Hour
C. comic book D. environmental science book
2. What is the article manily about
3. What problems does the article discuss
D
Read the article and finish the following questions.
Environmental problems.
The greenhouse effect, cutting down forests and bat habits.
Post-reading
05
1 ______________ the flood, many people were left homeless. (because of the effect of)
2 The world population will continue to _________ for many years to come. (to become greater in number)
3 The mountain is high. It is 3,000 metres above _________. (the height of the ocean)
As a result of
increase
sea level
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.
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.
Post-reading
05
4 Man first walked on the _________ of the Moon in 1969. (the to part of an area of land)
5 There were ______________ toys in the shops during the Christmas holiday. ( a very large number of)
surface
mountains of
Post-reading
05
Mark: The burning and cutting down of trees all over
the world __________ the loss of our forests.
Why do you think people do that
Jenny: The world’s population is growing
fast. That’s probably the main reason.
People need land to live on.
result in
C2 Complete the conversation below with the words from the box. Change their forms if necessary.
in danger make a difference take action
increase result in
loss /l s/ n. 损失
main /mein/ n. 主要的
live on 继续活着
need（情态动词）+动词原形
result in 造成；导致
in danger make a difference take action
increase result in
Post-reading
05
Mark: I suppose so. But forests are important to us. Trees take in CO2. When so many trees are being cut down, the CO2 in the Earth’s atmosphere ____________. This causes the temperature to rise and puts the world __________.
is increasing
in danger
take in 吸收
are being+动词的过去分词: 正在被……
现在进行时的被动语态
cause ... to do sth 造成……去做某事……
put … in danger 把……置于危险中
C2 Complete the conversation below with the words from the box. Change their forms if necessary.
Post-reading
05
Jenny: To _________________, we need to stop cutting
down so many trees, and we should use as few
wood products as possible.
Mark: You’re right. Everyone should ___________ to
protect the Earth.
make a difference
take actions
as … as possible 尽可能……
stop doing sth. 停止正在做的事情
in danger make a difference take action
increase result in
C2 Complete the conversation below with the words from the box. Change their forms if necessary.
need to do sth. 需要去做某事
Post-reading
05
D1 Replace the italicized words with information from the article on page 35.
1. The writer says that it is in danger.
____________________________
2. It is necessary for all living things.
____________________________
3. CO2 comes from burning them.
____________________________
4. This causes sea level to rise.
____________________________
5. It causes the surface of the soil to be easily destroyed by rain.
____________________________
6. Many of our habits cause this.
____________________________
our world/ The Earth
the atmosphere around the Earth
fuels such as petrol and coal
the increasing temperature
cutting down trees
pollution
Post-reading
05
D2 Read the article again and circle the correct answers.
1. Because of pollution, __________.
a not enough sunlight is reaching the Earth
b not enough heat is leaving the Earth
c not enough CO2 is leaving the Earth
2. If there are more trees, the amount of CO2 in the atmosphere will be __________.
a greater b less c the same
Post-reading
05
3. We can help protect the environment if we ___________.
a change our bad habits
b become consumers
c buy more products
4. The purpose of the article is to make ____________.
a people do more to protect the environment
b more people become consumers
c people learn more about the environment
Post-reading
05
D3 In groups, discuss the following questions.
The writer gives an example of a bad habit that causes pollution. Can you name some other bad habits that cause pollution
In order to save ourselves, we should solve the problem of the plastic bottles and plastic bags. What should we do to help protect the environment
Practice
06
Work in pairs, read the passage again and answer the questions.
1. Why must people do something to protect the environment
Because our world is in danger.
2. What causes sea level to rise
The greenhouse effect.
Practice
06
3. What controls the temperature on Earth
The atmosphere.
4. What should people do to protect the environment
People should become “green consumers”.
Practice
06
Fill in the blanks according to the article of Page 35.
Our world is in danger. We are facing many problems now.
The atmosphere around the Earth is necessary for all ________(live) 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 _______ as the Moon-cold and _______(life). However, we produce too much carbon dioxide and this causes the atmosphere ________(keep) in too much heat. The greenhouse effect makes sea level rise, and in the future it may make cities __________(appear).
living
same
lifeless
to keep
disappear
Practice
06
Every year, we destroy nature by _________(cut) down huge areas of forests. This makes the greenhouse effect _________(bad) and results in floods.
What’s more, many of our habits cause __________(pollute). For example, we use things once and then throw them away, or leave them on the ground as litter. This creates mountains of rubbish and _________(pollute) our land and seas.
In order to protect the environment, we must take proper action. We should be green consumers. If we just learn to live _______ new and different ways, we can make a difference.
cutting
worse
pollution
pollutes
in
Summary
07
担心；忧虑
无生命的
燃料
消费者
猜测
环境保护的；赞成环境保护的
煤
结果
增加
海平面
The words we have learned
concern
lifeless
fuel
consumer
guess
green
coal
result
increase
sea level
Summary
07
摧毁；毁灭
自然界；大自然
表面；表层
土壤
洪水；水灾
习惯
正确的；恰当的
无害的
回收利用
目的；用途
The words we have learned
destroy
nature
surface
soil
flood
habit
proper
friendly
recycle
purpose
温室效应
在危险中
由于
造成；导致
许多；大量
采取行动
有作用；有影响
吸收
The phrases we have learned
Summary
07
greenhouse effect
in danger
as a result of
result in
mountains of
take action
make a difference
take in
Summary
07
The sentences we have learned
We must do something to protect the environment.
我们必须做些事来保护环境。
解析：do something to do ... 意为“做些事情……；
采取措施……”，可与 take action to do ... 互换。
句式转换：我们应该采取措施来保持教室干净。
We should do something to keep the classroom clean.
= We should to keep the classroom clean.
take action
Summary
07
The sentences we have learned
... letting sunlight in and keeping heat from getting out.
……让阳光进来并防止热量散发出去。
解析：let sb / sth in 意为“让某人 / 某物进入”，反义
短语：let sb / sth out “让某人/某物出去” 。
汉译英：
请开门，让我进去。
Please open the door and let me in.
这狗太吵了，我想放它出去。
The dog is too noisy. I want to let it out.
Summary
07
The sentences we have learned
Without it, the Earth would be the same as the Moon — cold and lifeless. 没有它，地球就会和月球一样——寒冷且没生命。
解析：the same as ... 意为“与……一样”，该短语可以拆开使用，即：the same ... as ...，same 后面接名词，意为“像……一样的……”。
完成句子：
我的书包跟你的一样。
My school bag is yours.
我有一个像这样的书包。
I have this.
the same as
the same school bag as
Summary
07
The sentences we have learned
If we just learn to live in new and different ways, we can make a difference. 如果我们学会用新的和不同的方式生活，我们就能起作用。
解析：make a difference 意为“有影响；有作用”，其反义短语为 make no difference 意为“没影响；没作用；没差别”。
汉译英：
你选哪一个至关重要。
Which one you choose will make a difference.
Assessment
08
Self-assessment
How well do you know about this lesson Tick (√)the boxes.
I can read an article about the environment. 口 口 口
I can use clear and concise sentences to retell the article. 口 口 口
I can use correct spelling and punctuation. 口 口 口
I can use correct tense. 口 口 口
Homework
9
拓展：结合思维导图和所学单词、短语、句型，复述课文.
基础：借助工具书，将重点单词、短语整理在笔记本上.
提升：根据课文与同学讨论：What are the main problems we face and what should we do to protect the earth
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