Unit 2 Topic 2 All these problems are very serious. Section C 课件(共25张PPT，内嵌音频) 2023-2024学年英语仁爱版九年级上

(共25张PPT)
Unit 2
Saving the Earth
Topic 2 Section C
学习导航
新知学习
课堂小结
当堂检测
学习目标
重点研讨
新课导入
Fill in the blanks using something, anything, others, nobody, everyone, anybody, everywhere, none, other.
Review
(1)_______ of us knows how to stop the bad behavior.
(2) I knocked on the door but _______ answered.
(3) Some of these books are better than ______.
(4) She was driving the car with one hand and wiping the window with the
_______.
(5) They are beautiful but I am looking for ___________ useful.
(6) Is there ________ you can do to help her
(7) There’re 5 000 people living here and almost _________ has his/her
own car.
(8) He’s cleverer than ________ I know.
(9) I’ve looked __________ but I can’t find it.
None
nobody
others
other
something
anything
everyone
anybody
everywhere
新知学习
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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. 能进一步学习各种污染对地球造成的危害
和造成这些污染的原因
3. 能根据不同的阅读目的，运用简单的阅读策略
获取信息
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New words
Ozone is a special kind of oxygen. It can protect the earth.
ozone layer
[ o zo n ler]
[ ɑ ks d n]
臭氧
氧气
臭氧层
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People produce lots of harmful chemicals into the air. They cause a big hole in the ozone layer. So the radiation can pass through the hole and reach the earth directly.
[ re di e n]
穿过
[d rektli]
New words
放射物
直接地
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New words
carbon dioxide
/ kɑ:b n da ksa d/
oxygen
/ ' k s d n/
CO2 二氧化碳
O2氧气
Trees can breathe in__________________
and breathe out_________________.
carbon dioxide(CO2)
oxygen(O2)
吸入
呼出
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形成
/ bl k t/
毯子
/ ske p/ 逃离、渗出
It has formed a blanket and the heat
from the sun can’t escape.
The temperature is rising.
rise / ra z/ 上升
But Carbon dioxide has increased a lot.
(增加)
(热气)
New words
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1a
Read and understand.
Look at the following pictures and predict the main idea of the passage.
fewer trees
factory pollution
traffic pollution
the ozone hole
more carbon dioxide
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The earth is 4.6 billion years old. We humans have lived on the earth for only 35 000 years, but during this period, we have changed our planet a lot in many ways. Some things we have done are very good for the earth while others are bad.
___________ All over the world, people have cut down millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so many kinds of animals and plants are disappearing.
Fewer Trees
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______________ In big cities, cars and buses have polluted the air. Now many people in cities have health problems.
_______________ Factories have also polluted the land and the water. As a result, many rivers and lakes are now dead.
______________ Around the earth, there's a special kind of oxygen called “ozone”(O3). It is important to the earth. But now air pollution is destroying it and making a very big hole in the ozone layer. Too much harmful radiation from the sun passes through the hole and reaches the earth directly. This is very dangerous because this kind of radiation can cause cancer.
Traffic Pollution
Factory Pollution
The Ozone Layer
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_________________ Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil, coal and wood. This has formed a blanket around the earth. The heat from the sun can't escape so the temperature is rising. This is called “the greenhouse effect”. It causes the level of the oceans to rise and the climate of the earth to change.
All these problems are very serious, so we must do something now.
More Carbon Dioxide
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1b
Read 1a and complete the following tasks.
1. Choose suitable titles for Paragraphs 2-6. Then write it down in front of
each paragraph.
A. Traffic pollution B. Factory pollution C. Fewer trees
D. The ozone hole E. More carbon dioxide
2. What does our planet mean here
A. The sun. B. Mars.
C. The moon. D. The earth.
※
3
4
2
5
6
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3. In the passage, blanket refers to ____.
A. carbon dioxide around the earth
B. the ozone layer in the sky
C. the forests around the world
D. pollution all over the world
4. The word it in Paragraph 5 refers to ____.
A. CO2 B. O3 C. O2 D. H2O
5. What is the best title for this passage
A. Environment Problems
B. Pollution on the Earth
C. Hope for the Future
D. The Greenhouse Effect
※
※
※
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1c
Complete the notes according to 1a.
Problem Effect on the environment
fewer trees forests become deserts, animals and plants disappear
traffic pollution
greenhouse effect, level of oceans rising, climate change
… …
cars and buses pollute air, health problems
pollute land and water, rivers and lakes dead
harmful radiation reaches the earth, cause cancer
factory pollution
ozone hole
more CO2
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2
Surf the Internet to collect more information about environmental problems and effects. Then discuss the information in groups and take notes.
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3
Combine the key points in 1c and 2 to form a short passage and pay attention to the proper linking words.
As we all know, water pollution is becoming more and more serious. Some factories pour waste water into the rivers. As a result, it makes the water dirty and smell terrible. Most of fish in the water have died and we can’t swim in the water. Water is very important to human beings, so we should do our best to protect and save it. Luckily, our government is taking measures to protect the water from pollution.
You can write it like this:
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Key points
1. Some things we have done are very good for the earth while others
are bad.
我们所做的一些事情对地球有益，然而其他一些对地球却有负面影响。
※ We have done…前省略了that,作定语从句，修饰前面的some things.
※ be good for 对……有益； be good at = do well in 擅长……;
eg: Doing morning exercises is good for our health.
做早操对我们的健康有益。
He is good at swimming. 他擅长游泳。
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※ ① while conj. 而，然而，相当于but. 表示对比；
eg: He is a worker, while I am a teacher. 他是工人而我是教师。
② while conj. 引导时间状语；
eg: While she was listening to the radio, she fell asleep.
她听着收音机睡着了。
③ while conj. 引导让步状语从句，意思是“虽然……但是……”、“尽管……但是……”(多放于句首)；
eg: While he loves his students, he is very strict with them.
虽然他爱他的学生，可是他对他们很严格。
④ while conj. 引导条件状语，意思是“只要”；
eg: While there is life there is hope.只要生命存在，就有希望。
⑤ while作名词用，表示“一会儿”“一段时间”；
eg: She likes to lie down for a while after lunch.她喜欢午饭后躺一会儿。
新知学习
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2. The earth is taken away. 泥土被带走。
take away 拿走、带走
Eg: 难道你要拿走他们的铅笔吗？
Are you goingt to their pencils
take away
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3. As a result, many rivers and lakes are now dead.
结果，许多河流和湖泊都死了。
※ as a result 因此，结果
Eg: 因此，他们会非常具有说服力。
, they can be very persuasive.
As a result
※ be dead
死气沉沉
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pass through the hole 穿过洞
pass through
Eg: 空气可以通过潮湿的布料。
Air will the wet cloth.
pass through
4. Too much harmful radiation from the sun passes through the hole and reaches the earth directly.
来自太阳的太多有害辐射穿过该孔并直接到达地球。
穿过
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5. It causes the level of the oceans to rise and the climate of the
earth to change.它导致了海平面的上升以及地球气温的变化。
the level of the oceans 海平面
cause 造成 、 使(发生)
Eg: 吸烟可导致肺癌。
Smoking may cause lung cancer.
Eg: 这个坏消息使她伤心。
The bad news caused her to be sad.
※ cause… to do…
※ cause sth.
新知学习
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Unit 2
Topic 2 Section C
重点单词短语：
while; cause; be good for；
take away; as a result;
be dead; pass through;
the level of the oceans
各种污染对地球造成的危害和造成这些污染的原因
新知学习
课堂小结
当堂检测
学习目标
重点研讨
根据句意及首字母提示写出正确的单词。
1. The river has r______ because of the heavy rain.
2. You should dig a big h____ in the earth first if you want to plant a tree.
3. She managed to e_____ from the burning car though she was badly hurt.
4. Playing basketball is one of the f______ of physical exercise.
isen
ole
scape
orms