Unit 2 Saving the earth. Topic 3 Section C 课件（内嵌音频，共24张PPT） 仁爱版九年级英语上册

(共24张PPT)
Unit 2
Saving the Earth
Topic 3 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
新知学习
课堂小结
当堂检测
学习目标
重点研讨
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. 能通过阅读文章，了解现代科学技术在环境
保护方面的作用
新知学习
课堂小结
当堂检测
学习目标
重点研讨
dis(no)+advantage=disadvantage (n)
It’s an electric car. It works well, but its disadvantage is that it’ slow and can’t run for long.
Look at the following pictures and guess the meaning
of the underlined word.
缺点
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It’s a maglev train. It has no wheels but it runs very fast. It can run more than four hundred km per hour.
磁悬浮列车
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n.技术
China is one of the first countries in the world to use biogas technology.
沼气
It’s an electric car. It works well, but it’s slow and can’t run for long.
electric (adj.) — electricity (n.)
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电动的
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1a
Read and understand.
In many countries, people produce power from coal, but it is very dirty and causes acid rain. Some countries use nuclear energy to produce power. However, nuclear power can be very dangerous. To solve the energy problem, people all over the world are looking for new ways to produce power.
China is one of the first countries in the world to use biogas technology. Farmers recycle straw, grass and animal waste to make biogas. This renewable energy is used in people’s everyday lives. Its key disadvantage is that the process requires a long time(up to 30 days) and the cost is high.
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Electric vehicles were developed in the 1990s. On April 11, 2010, a new kind of electric vehicle named “Yezi” was shown in the 2010 Shanghai World Expo. It produces electricity from the sun, the wind and CO2. It can not only protect the environment but also save energy. It’s too small to hold many people, but larger models will be developed in the near future.
In China, the best-known maglev train is the German-built one in Shanghai. It takes people just 7 minutes to go to the airport 30 km away. The train can reach a top speed of 431 km per hour. It is quiet and quick. There is no wheel noise, because there are no wheels. Maglev trains are very energy-efficient and do not pollute the air. However, maglev guide paths are much more expensive than traditional steel railways.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
Look at the pictures. Do you know what they are Choose the right picture for each paragraph.
paragraph 2
paragraph 3
Paragraph 4
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1b
Read 1a and match the words with the pictures on Page 48.
A. acid rain B. nuclear energy C. biogas
A
C
B
( )
( )
( )
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1c
Read 1a again and complete the table.
Item Advantage Disadvantage
biogas
electric vehicle
maglev train
renewable
long process and high cost for its building
save energy,
no pollution
too small to hold many people
quiet, quick, energy-efficient, no pollution
much more expensive than traditional steel railways
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2a
Read the passage below and match the pictures with the sentences. Then discuss in detail the use of one energy source.
The sun, wind, waves and heat from deep in the earth are energy sources. They will never run out so they are called renewable sources. In 2011, about 16% of energy used worldwide came from renewable sources. The use of it is increasing rapidly each year.
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Wind can produce electricity in many places.
People use sunlight to produce electricity.
Sea waves are used for producing electricity.
People use hot water or steam from deep in the earth to produce electricity and heat for factories, schools and homes.
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2b
Take notes on your discussion and write a passage with them.
You may begin like this:
Sunlight can produce a lot of energy. People began to use the energy from the sunlight in different ways many years ago…
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Sunlight can produce a lot of energy. People began to use the energy from the sunlight in different ways many years ago. We can use it to warm the house in the winter, to heat the water for baths, and to produce electricity. What’s more, we can even use it to run vehicles directly in the near future.
As is known to us, the energy from the sunlight has a lot of advantages. For example, it is clean, renewable and non-polluting. Besides, it does no harm to our nature. So we’d better use it as much as possible.
You can write it like this:
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Key points
1. Some countries use nuclear energy to produce power.
use sth. to do sth./ use sth. for doing. 使用某物来做某事
eg:
People used bamboo to write with in the past.
在过去人们使用竹子写字。
People use wind for producing electricity.
人们用风发电。
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2. Its key disadvantage is that the process requires a long time (up to 30 days ) and the cost is high.
它最大的缺陷是生产过程需要很长时间（长达30天）和成本高。
process n. 步骤，过程 v.加工，处理
require v.需要，需求
require 有两种用法：
*require (doing) sth. 表示主语“该……了”。
eg: The floor requires washing. 地板该洗了。
*be required to do sth.表示主语必须（被要求）……
eg: Students are required to attend classes.
学生必须按规定上课。
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3. It’s too small to hold many people,but the larger models will be developed in the near future.它太小，不能承载太多的人，但在不久的将来，更大的车型将会被研制出来。
①　hold v. 容纳，包含；
eg: The plane holds about 300 passengers. 这架飞机可容纳大约300名乘客。
②　hold v. 拿着，抓住，抱住；
eg: He was holding the baby in his arms. 他抱着婴儿。
③　hold v. 召开，举行，进行（比赛，会议等）；
eg: The Olympic Games are held every four years. 奥运会每四年举行一次。
④　hold v. (打电话时）等待，不挂断；
eg: Hold on, please! 请稍等。
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4. The train can reach a top speed of 431 km per hour.
这辆火车最高速度能达到431公里每小时。
reach a speed of+具体速度——达到某个速度
拓展：at a speed of + 具体速度——以某个速度, 可用high, low, full等形容词修饰speed 。
eg: Beijing-Tianjin train reaches a speed of 300 km per hour.
北京至天津线火车时速达到每小时300千米。
新知学习
课堂小结
当堂检测
学习目标
重点研讨
1.用某物做某事
2.被用来做某事
3.过去常常做某事
4.适应于做某事
5.全世界
6.寻找
Key phrases
use sth to do/for doing sth
be used to do/for doing sth
used to do sth
be/get used to doing sth
all over/around the world
look for
7.达到……的数量
8.……之一
9.太……而不能
10.一种……
11.不但……而且
12.在不久的将来
13.达到……的速度
14.以……的速度
15.用完，用光，耗尽
up to...
one of+名词复数+...
too ... to
a kind of
not only... but also
in the near future
reach a ... speed of
at a speed of
run out
新知学习
课堂小结
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学习目标
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新知学习
课堂小结
当堂检测
学习目标
重点研讨
Unit 2
Topic 3 Section C
重点单词短语：
require；hold；
reach a speed of；
use sth. to do sth./ use sth. for doing.
了解现代科学技术在环境保护方面的作用
根据句意及首字母提示写出正确的单词。1. The river is too d . It's dangerous to swim in it2. My car doesn't work. It r repairing.3. Lily's mother is a g____. She often travels all over the world.4. We are all in a________ (同意) on that point. 5. He n his head as if to say yes.
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课堂小结
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eep
equires
uide
greement
ods