Unit 2 Saving the Earth

Topic 3 Would you like to be a greener person? Section C

Teaching aims and demands 1.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 words powern. acid rain nuclearadj. biogas n. technologyn. straw n. electricadj.

efficient adj. maglev train perprep. wheeln. guiden. steeln. movementn.

1a 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 b c

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 peoples everyday life.

______ 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 alone Read 1a again and fill out the following table. Way to produce powerAdvantageDisadvantage Biogas Electric vehicle Maglev train

2 Work alone Read carefully and match each sentence with the right picture. Then think about what else can be used to produce electricity. a. There are than 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 work What good habits can protect the environment? List as many as you can, the more you list, the greener you are. Good Habits 1.Turn off he lights when you leave a room. 2.___________________________________ 3.___________________________________ 4.___________________________________ … …

turn off switch off turn off turn on Explanation Turn off he lights when you leave a room. Would you please turn off the radio?

turn on, turn off, turn up, turn down turn turn on turn off turn up turn down turn on turn off turn down turn up

Please turn on / off the radio. / The TV is too loud, please turn it down., on, off, up, down

Exercises

1. We ______ protect the environment. A. supposeB. supposed C. suppose to D. are supposed to 2. Dont forget to turn ______ the TV when you leave the room. A. on B. down C. up D. off 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. findingB. find C. to findD. found 5. These boxes are still new. Dont ______. All right. A. throw away B. throw them away C. threw away D. throw it away A B C

Homework Turn to your parents and your friends and try to find some other kinds of materials that can produce electricity.