Unit 2

Saving the Earth

Topic 3Topic 3

Would you like to be a greener person?

Section CSection C

Teaching aims and demands1.Learn new words: power, acid, nuclear, technology, electric, maglev, per, wheel, guide, steel, movement.2. Go on learning some compound sentences:(1) In many countries, people produce power from

coal, but it is very dirty and causes acid rain.(2) Although electric vehicles produce no pollution,

there will be an increase in electricity needs if they are widely used.

3. Learn the advantages and disadvantages of some kinds of energy.

New wordsNew words

power n. 电力；动力；力acid rain 酸雨

nuclear adj.原子核的，原子能的；核动力的

△biogas n. 沼气technology n. 技术

△straw n. （收割后干燥的）禾杆，麦秆，稻草

electric adj. 电动的，用电的

△efficient adj. 效率高的；有能力的

maglev train 磁悬浮列车

per prep. 每，每一

wheel n. 轮，车轮，轮子

guide n. 向导，导游；指南，手册

steel n. 钢，钢铁

movement n. 运动；活动

1a Read and understand1a Read and understand

1. Look up these words in a dictionary. Then understand the meanings further by reading the message.

power acid rain

nuclear renewable

electric efficient

2. Choose the right picture for each paragraph.

a

bc

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 all the time 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 life.

【【点击播放点击播放】】

______ Electronic vehicles were developed in

the 1990s. Now there are electric vehicles in

many countries. They are very efficient and

cost very little to run. Although electric vehicles

produce no pollution, there will be an increase

in electricity needs if they are widely used.

______ In China, the best-known maglev train is

the German-built one in Shanghai. It takes people

30 km to the airport in just 7 minutes and reaches

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 Work alone1b Work aloneRead 1a again and fill out the following table.

Way to produce power Advantage Disadvantage

Biogas

Electric vehicle

Maglev train

2 Work alone2 Work aloneRead carefully and match each sentence with the right picture. Then think about what else can be used to produce electricity.a. There are than 3 000 power stations in world that produce electricity by burning garbage to heat water.

b. People use the movement of waste to produce electricity.

c. Wind is used for producing electricity in many places.d. People produce electricity from the sun.

（ ） （ ）

（ ） （ ）

3 Written workWhat good habits can protect the environment? List as many as you can, the more you list, the greener you are.

Good Habits1.Turn off he lights when you leave a room.

2.___________________________________

3.___________________________________

4.___________________________________

… …

turn off 意为“关掉”，常指关自来水、电灯以及家用电器等，相当于 switch off 。 turn off 与 turn on 相对。如：

ExplanationExplanationTurn off he lights when you leave a room.

Would you please turn off the radio? 请把收音机关掉好吗？

turn on, turn off, turn up, turn down 都与 turn一词有关。 turn on 意思是“打开”，常指开灯、开家用电器； turn off 意思是“关掉”，常指关自来水、电灯以及家用电器； turn up意思是“开大一点”、“调高（音量）”等；turn down 意思是将收音机、电视机、广播等的声音、亮度等“关小”、“调低”。这一组词组中 turn on 与 turn off 相对应， turn down 与 turn up 相对应。

Please turn on / off the radio.

请把收音机打开 / 关上。The TV is too loud, please turn it down.

电视太吵了 , 请把它关小一点。

这些短语中的 on, off, up, down 均为副词。同时必须注意代词作它们的宾语时，其位置置于词组中间。如：

ExercisesExercises

1. We ______ protect the environment.

A. suppose B. supposed

C. suppose to D. are supposed to

2. Don’t forget to turn ______ the TV when you

leave the room.

A. on B. down C. up D. off

选择填空。

D

D

3. Some people love pets, ______ others hate

them.

A.as B. when C. while D. and

4. The Internet can be used for ______ jobs.

A. finding B. find C. to find D. found

5. —These boxes are still new. Don’t ______.

—All right.

A. throw away B. throw them away

C. threw away D. throw it away

A

B

C

HomeworkHomeworkTurn to your parents and your

friends and try to find some

other kinds of materials that

can produce electricity.