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1、Unit 2 Saving the Earth,Topic2 All these problems are very serious.,Section C,1. _ its raining hard, he keeps on working outside. 2. Kangkang can play the voilin, _ I cant. 3. Mr. Lin is very kind _ he is very humorous, too. 4. The suit fits me well _ I cant afford it.,Though,while,and,but,Fill in t
2、he blanks using but, and, though and while.,Revision:,What new ways have been invented to produce power?,Ask and answer:,electric vehicle,biogas technology,What new ways have been invented to produce power?,Ask and answer:,maglev train,water battery,Look up these words in a dictionary.,power,acid ra
3、in,nuclear,renewable,electric,efficient,电力； 动力；力,酸雨,原子核的， 原子能的； 核动力的,可更新的,电动的， 用电的,效率高的； 有能力的,Wind is used for producing electricity in many places.,Look at the following pictures and guess the meaningof the underlined word.,Guessing game,More and more people are interested in electric cars.,Guessin
4、g game,The maglev train in Shanghai uses magnets. The magnets push the train forward.,Guessing game,people produce power from coal, but it is very dirty and causes acid rain.,Guessing game,Nuclear power is clean but it is very dangerous.,Guessing game,fewer trees,factory pollution,traffic pollution,
5、the ozone layer,more carbon dioxide,Can you match them?,Read and understand,1a,Choose the right picture for each paragraph.,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
6、very dangerous. To solve the energy problem, people all over the world are looking all the time for new ways to produce power.,c,_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
7、peoples everyday life.,Choose the right picture for each paragraph.,_ Electric 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 e
8、lectricity needs if they are widely used.,a,_ In China, the best-known maglev train is the German-built one in Shanghai. It takes people 30km 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. Magl
9、ev trains are very energy efficient and do not pollute the air. However, maglev guide paths are much more expensive than traditional street railways.,b,1. Why isnt coal a good material? 2. What is the disadvantage of using nuclear power? 3. What do you think of electric cars? 4. What do you think of
10、 the maglev train?,Because it is very dirty and causes acid rain.,Because it can be very dangerous.,It is quiet and quick.,They are very efficient and cost very little to run.,Ask and answer:,Answer the following questions according to 1a.,Read 1a again and choose the best answers.,1、What does our p
11、lanet mean here? A. The sun. B. Mars. C. The moon. D. The earth.,Read 1a again and choose the best answers.,1、What does our planet mean here? A. The sun. B. Mars. C. The moon. D. The earth.,Read 1a again and choose the best answers.,2、Which is NOT true? A. Cars can pollute the air. B. Factories can
12、pollute the water. C. The fewer trees, the better. D. Not all the things we have done are good for the earth. 3、The word it in the passage refers to _. A. CO2 B. O3 C. O2 D. H2O,Read 1a again and choose the best answers.,4、In the passage, “blanket” refers to _. A. carbon dioxide around the earth B.
13、the ozone layer in the sky C. the forests around the world D. pollution all over the world 5、The level of the oceans is rising because of _. A. pollution B. few trees C. the greenhouse effect D. changes in the climate,Read 1a again and choose the best answers.,6、What is the best title for this passa
14、ge? A. Environmental Problems B. Pollution on the Earth C. Hope for the Future D. The Greenhouse Effect,Ozone is very important to the earth.,O3:,Written work,Discuss the meanings of the following expressions and then write down how they affect the environment.,A special kind of oxygen called “ozone
15、”,The ozone layer can prevent the suns harmful radiation from reaching the earth. But now air pollution is destroying the ozone layer. This is very dangerous because this kind of radiation can cause cancer.,CO2:,the greenhouse effect:,More and more carbon dioxide forms a “blanket” around the earth.,
16、Written work,Discuss the meanings of the following expressions and then write down how they affect the environment.,Carbon dioxide. It mainly comes from burning oil, coal and wood.,Carbon dioxide around the earth makes the temperature rise.,The heat from the sun cant escape so the temperature is rising. It causes the level of the oceans to rise and the climate of the earth to change.,Homew
