Unit 2 Topic 3 Section C课件（仁爱科普版九年级上册）

(共27张PPT)
Unit 2 Saving the Earth
Topic 1 What can we do at home to protect the environment
Section C
Learn some new words and phrases.
Get to know: acid, nuclear, biogas, straw, renewable, disadvantage, process, electric, best-known, maglev train, per, efficient, path, steel, wave, source, run out, worldwide, sunlight, steam
Be able to use: technology, require, German, wheel, guide, deep
Be able to use some useful expressions.
(1)In many countries, people produce power from coal, but it is very dirty and causes acid rain.
(2)They will never run out so they are called renewable sources.
Talk about the advantages and disadvantages of some kinds of energy.
How can we become a greener person
Turn off the lights when we leave a room.
Walk or ride a bike instead of taking a bus or a taxi.
Take a cloth bag when we go shopping.
Don’t drive a car if you travel a short distance.
Write on both sides of the paper.
Don’t use the things that can be used only once.
After we wash faces, we can use the water to wash clothes.
Turn off the TV set while we are away.
…
section B
1a Read and understand.
Look at the pictures. Do you know what they are Choose the right picture for each paragraph.
Paragraph 2
Paragraph 3
Paragraph 4
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.
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 enerey. 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.
1b Read 1a and match the words with the pictures on Page 48.
A. acid rain B. nuclear energy C. biogas
A
C
B
1c Read 1a again and complete the table.
Item Advantage Disadvantage
biogas
electric vehicle
maglev train
renewable
long process and high cost
save energy, no pollution
too small to hold many people
quiet, quick, energy-efficient, no pollution
much more expensive
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.
2a Read the passage below and match the pictures with the sentences. Then discuss in detail the use of one energy source.
（2）
（4）
（1）
（3）
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.
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…
Example
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.
1. Some countries use nuclear energy to produce power.
use sth. to do sth. 使用某物做某事
nuclear energy 核能
2. However，nuclear power can be very dangerous.
however 然而
dangerous 危险的
3. To solve the energy problem,people all over the world are looking for new ways to produce power.
all over the world 全世界
looking for 寻找
4. China is one of the first countries in the world to use biogas technology.
one of +可数名词复数 ……之一
biogas technology 生物技术
5. Electric vehicles were developed in the 1990s.
in+the +年份s 在几世纪几十年代
6. It can not only protect the environment but also save enerey.
not only...but also 不但……而且……
7. It’s too small to hold many people, but larger models will be developed in the near future.
too+adj. to do sth. 太……而不能做某事
8. It takes people just 7 minutes to go to the airport 30km away.
It takes sb. sth. to do sth. 花费某人多长时间做某事
9. Maglev trains are very energy-efficient and do not pollute the air.
energy-efficient 节能的
use sth. to do sth. 使用某物做某事
nuclear energy 核能
all over the world 全世界
look for 寻找
biogas technology 生物技术
not only... but also 不但……而且
too+adj. to do sth. 太……而不能做某事
It takes sb. sth. to do sth. 花费某人多长时间做某事
energy-efficient 节能
We learn:
Talk about the advantages and disadvantages of some kinds of energy.
We can:
1. Some words:
acid, nuclear, biogas, straw, renewable, disadvantage, process, electric, best-known, maglev train, per, efficient, path, steel, wave, source, worldwide, sunlight, steam, technology, require, German, wheel, guide, deep
2. Some phrases:
run out
3. Some sentences:
(1) In many countries, people produce power from coal, but it is very dirty and causes acid rain.
(2) They will never run out so they are called renewable sources.
一、单项选择
( ) 1. We all know that learning a language ______ time and effort.
A. requires B. reduces C. removes
( )2.We think human beings may live on the moon in the future. ______, no one is sure about it.
A. While B. Whatever C. However
( )3. —What do you think of your new classmate
—She ______ has good grades ______ is glad to help others.
A. too...to B. not only... but also C. so...that
A
C
B
一、单项选择
( )4. —Do you take exercise every day —Yes. It usually ______ me about half an hour to do that.
A. spends B. costs C. takes
( )5. —Do you think fresh water can ______ on earth one day
—I’m afraid so, if people don’t save it.
A. take out B. go out C.run out
C
C
二、用所给的适当形式填空
guide , wheel, require, German, technology
1. He studies at a college of science and ____________.
2. Kris and Karl come from Europe. They’re ___________.
3. The front ________ of the bike was out of shape.
4. Please call me if he __________ my help.
5. I know the place well, so let me be your _________.
technology
Germans
wheel
requires
guide
1. Read 1a.
2. Memorize the useful expressions and key sentences which we learn today.
3. Finish Section C in your workbook.
4. Write a passage about one of the energy sources in 2a.