九上U2T3SC.ppt

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1、 Unit 2 Topic 3Unit 2 Topic 3 Would you like to be a greener person?Section CUse but,and,while to answer the following questions.What activities should we do to protect the environment?What activities shouldnt we do to protect the environment?Look up these words in a dictionary.power acid rain nucle

2、ar renewable electric efficient电力；电力；动力；力动力；力酸雨酸雨原子核的，原子核的，原子能的；原子能的；核动力的核动力的可更新的可更新的电动的，电动的，用电的用电的效率高的；效率高的；有能力的有能力的Wind is used for producing electricity in many places.Look at the following pictures and guess the meaningof the underlined word.More and more people are interested in electric cars.L

3、ook at the following pictures and guess the meaningof the underlined word.The maglev train in Shanghai uses magnets.The magnets push the train forward.Look at the following pictures and guess the meaningof the underlined words.people produce power from coal,but it is verydirty and causes acid rain.L

4、ook at the following pictures and guess the meaningof the underlined words.Nuclear power is clean but it is very dangerous.Look at the following pictures and guess the meaning of the underlined word.Listen read and answer.录音录音p45-1aWhy isnt coal a good material?What is the disadvantage of using nucl

5、ear power?What do you think of electric cars?What do you think of the maglev train?It is very dirty and causes acid rain.Nuclear power can be very dangerous.It is quiet and quick.They are very efficient and cost very little to run.Choose the right picture for each paragraph of 1a.abcChina is one of

6、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.Electric vehicles were developed in the 1990s.Now there are electric vehicles in many countries.They are very efficient and cos

7、t 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 just 7 minutes to go to the airport 30 km away and reaches a top speed

8、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.1bWork aloneRead 1a again and complete the following tabl

9、e.Way to produce powerAdvantageDisadvantagebiogaselectric vehiclemaglev trainrenewable efficient,cheap,no pollution quiet,quick,energry efficient,no pollution It will cause an increase in electricity needs.much more expensive than traditional trains.key words:1.In many countries,people produce power

10、 from coal,but it is very dirty and causes acid rain.some countries use nuclear energy to produce power.在许多国家，人们用煤发电，但是用煤发电很脏，还会造成酸雨。一些国家用核能发电。（1）power n.动力，力electric power 电力 water power水力(2)nuclear adj.核能的nuclear power/energy 核动力/核能a nuclear power plant 核电站the nuclear industry 核能工业2.They are very

11、efficient and cost very little to run.它们的效能很好，而且用起来花费也不多。（1）efficient adj.效能高的，有能力的The old machine is less efficient than before.(2)run v.使运转，使运行，操作We can run the machine.3.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.它把旅客送到距离30千米外

12、的机场，仅仅只花七分钟的时间，其最高速度能达到每小时431千米。（1)it在这里指代上句中的磁悬浮列车。take在此不作“花费”讲，而是“运输，运送”的意思，相当于carry或transport.(2)reach a speed of+具体速度 表示“达到某种速度”，reach可用achieve 替换。介词短语at a speed of 后也接具体速度，表示“以某种速度”。e.g.He is driving to the center of the city at a speed of twenty miles per hour.at top speed=at full speed 以全速 a

13、t(a)high speed 以高速 at(a)low speed 以低速 at a safe speed 以安全的速度 with great speed 以极快的速度 with amazing speed 以惊人的速度a.There are more than 3 000 power stations in the world that produce electricity by burning garbage to heat water.b.People use the movement of water to produce electricity.c.Wind is used for

14、 producing electricity in many places.d.People produce electricity from the sun.()()()()abdcFill in the blanks using but,and,though and while.1._ its raining hard,he keeps on working outside.2.Kangkang can solve the problem,_ I cant.3.Mr.Lin is very kind _ he is very humorous.4.The suit fits me well

15、 _ I cant afford it.Though while and but Use but,and,though and while to describe the ways of producing power.3Written workWhat good habits protect the environment?List as many as you can.The more you list,the greener you are.1.Turn off the lights when you leave a room.2.Walk or ride a bike instead

16、of taking a bus or a taxi.3.Take a cloth bag when you go shopping.4.Dont use plastic bags.Useful expressionsIn many countries,people produce power from coal or nuclear energy.Its a pity that its too expensive to use in most of China.Work in groupsThink of more ways to produce power.And talk about their advantages and disadvantages.The method we have knownThe new method animal waste burn garbage water sun wind magnets1、列出更多的保护环境的好习惯。列出更多的保护环境的好习惯。2、课后搜集好的节能环保的方、课后搜集好的节能环保的方 法或者产品与大家交流。法或者产品与大家交流。3、预习、预习Section D。Goodbye!