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1、Unit 2 Saving the EarthTopic 3 What can we do at home to protect the environment? Section C Wind is used for producing electricity in many places.Look at the following pictures and guess the meaningof the underlined word. electricity n. 电，电电，电流流Nuclear power is clean but it is very dangerous.Look at
2、 the following pictures and guess the meaning of the underlined word. nuclear 原子核的，原原子核的，原子能的子能的people produce power from coal, but it is verydirty and causes acid rain.Look at the following pictures and guess the meaningof the underlined words.power n.动力，力量动力，力量 acid rain 酸雨酸雨electric (adj.) electr
3、icity (n.) Look at the following pictures and guess the meaningof the underlined words.Its an electric car. It works well, but its disadvantage is that it slow and Cant run for long. Its a maglev train. Its advantages are quiet, fast and clean, but its too expensive. 磁悬浮列车磁悬浮列车n.技术技术Do you know it ?
4、China is one of the first countries in the world to use biogas technology . 沼气沼气Match the words with the pictures on Page 48 (1b).A. acid rain B. nuclear energy C. biogas ACBadj.原子核的，原子能的酸雨1a Read and understand. Look at the pictures. Do you know what they are? Choose the right picture for each para
5、graph. paragraph 2 paragraph 3 Paragraph 4Read Paragraph 1 again, and then mark True (T) or False (F). ( ) Its good that people produce power from coal. ( ) Nuclear power is dangerous. So we cant use it. ( ) To solve the energy problem, people all over the world are looking for new ways to produce p
6、ower. 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.Read
7、Paragraph 1 again, and then mark True (T) or False (F). ( ) Its good that people produce power from coal. ( ) Nuclear power is dangerous. So we cant use it. ( ) To solve the energy problem, people all over the world are looking for new ways to produce power. TFT1.What do farmers use to make biogas?2
8、.It is the biogas perfect ? Why? 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 lives. Its key disadvantage is that the process requires a long time( up to 30 d
9、ays) and the cost is high1.What do farmers use to make biogas?2.It is the biogas perfect ? Why?They recycle straw, grass, and animal waste to make biogas.No, it isnt. Because its key disadvantage is that the process requires a long time (up to 30 days) and the cost is high. Electric vehicles were _
10、in the 1990s. On April 11, 2010, a new kind of electric vehicle _ “Yezi” was shown in the 2010 Shanghai World Expo. It produces _ from the sun, the wind and CO2. It can not only protect the environment but also _ energy. Its too small to hold many people, but _ models will be developed in the near f
11、uture. develop, electric, name, save, large developednamedelectricitysavelarger1.去去30公里以外的飞机场只需花费人们七分钟的时间。公里以外的飞机场只需花费人们七分钟的时间。2.火车最高时速能够达到每小时火车最高时速能够达到每小时431公里。公里。Find out the English version of the two sentences. In China, the best-known maglev train is the German-built one in Shanghai. It takes p
12、eople just 7 minutes to go to the airport 30 km away 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 t
13、raditional steel railways.1.去去30公里以外的飞机场只需花费人们七分钟的时间。公里以外的飞机场只需花费人们七分钟的时间。It takes people just 7 minutes to go to the airport 30 km away. 2.火车最高时速能够达到每小时火车最高时速能够达到每小时431公里。公里。The train can reach a top speed of 431 km per hour. 1c Read 1a again and complete the table. ItemAdvantageDisadvantagebiogas
14、electric vehicle maglev train renewablelong process and high cost for its building save energy, no pollutiontoo small to hold many people quiet, quick, energy-efficient, no pollution much more expensive than traditional steel railways Find out the key phrases in 1a1. look for new ways2. in the 1990s
15、3. one of the first countries4. people all over the world5. in peoples everyday/daily lives6. in the near future7. reach a top speed8. much more expensive9. use to do 10. be used for doing/ to do sth.1.寻找新方法寻找新方法2.在在20世纪世纪90年代年代3.首批国家之一首批国家之一4.全世界的人全世界的人5. 在人们的日常生活中在人们的日常生活中6.在不久的将来在不久的将来7.达到最高时速达到最
16、高时速8.更贵得多更贵得多9.用用来做来做10. 被用作被用作Language pointsSome countries use nuclear energy to produce power.思考：使用某物来做某事_/_练习：练习：a.在过去人们使用竹子写字.People _ bamboo _ _ with in the past. b.人们用风发电。People _ wind _ producing electricity. use sth. to do sth. use sth. for doing.used to writeusefor3. The train can reach a
17、top speed of 431 km per hour. 点拨：点拨：reach a speed of+具体速度 -达到某个速度链接：链接：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 。练习：练习：a.北京至天津线火车时速达到每小时300千米。Beijing-Tianjin train _ _ _ _ 300 km per hour. reaches a speed of2a Read the passage below and match the pictures with the sentences. Then dis
18、cuss 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.
19、deep adj.深的，厚的深的，厚的 adv.深深地，深深地， 在深处在深处run out 用完，耗尽用完，耗尽E.g. He has run out of food, so his children are hungry. run out /run out of 用完，耗尽用完，耗尽 run out 主语为物，且无被动。主语为物，且无被动。 run out of 主语为人主语为人 我们的食物已经用完了。我们的食物已经用完了。Our food has already run out.=We have already run out of the food.2a Read the passag
20、e below and match the pictures with the sentences. Then discuss in detail the use of one energy source.1.Wind can produce electricity in many places. 2.People use sunlight to produce electricity. 3.Sea waves are used for producing electricity. 4.People use hot water or steam from deep in the earth t
21、o produce electricity and heat for factories, schools and homes. 阳光，日光水蒸汽，蒸汽，水汽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 Sunlight can
22、 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. Whats more, we can even use it to run vehicles directly in the near future. As is known
23、 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 wed better use it as much as possible. You can write it like this:We learn: 1. Some words: technology, wheel, steel, require, German, guide
24、, 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.We can: Talk about the advantages and disadvantages of some kinds of energy.1.Read 1a again and try to retell it.2.Memorize the useful expressions and key sentences which we learn today.3. Finish Section C in your workbook.
