选修六 4.4《Unit 4listening&speaking》.ppt
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1、新课标人教版课件系列,高中英语 选修(模块)6-4.4,Speaking Listening,Warming up,Fossil fuel (化石燃料) : Ancient animal and plant material below the surface of the earth with a high carbon content, such as coal, oil and natural gas, which can be burnt to produce energy. Also known as non-renewable energy because once they ar
2、e used they have gone forever; they cannot be renewed.,From the following pictures, you will know where all this energy comes from.,windmills,a coal power station,an oil refinery,a nuclear power plant,solar panels,hydro-electric dam,Sample lists,light,heating,coal,non-renewable,oil,non-renewable,tel
3、evision,cassette player,video recorder,computer,natural gas,non-renewable,wind (wind power),renewable,sun (solar energy),renewable,uranium (nuclear energy),non-renewable,fridge,stove,washing machine,hairdryer,water( hydro-electric),renewable,plant waste (biomass energy),renewable,hot springs or geys
4、ers (geothermal energy),renewable,the sea (tidal energy),renewable,Renewable or non-renewable?,Renewable or non-renewable?,What is told in the picture?,non-renewable energy source,Notes to Renewable energy Renewable energy resources may be used directly, or used to create other more convenient forms
5、 of energy. Examples of direct use are solar ovens, geothermal (地温) heating, and water and windmills.,Examples of indirect use which require energy harvesting are electricity generation through wind turbines(涡轮) or photovoltaic(光电的) cells, or production of fuels such as ethanol(酒精) from biomass(生物量)
6、.,Renewable energy (sources) or RES capture their energy from existing flows of energy, from on-going natural processes, such as sunshine, wind, flowing water, biological processes, and geothermal heat flows.,Most renewable energy, other than geothermal and tidal power, ultimately(基本上) come from the
7、 Sun. Some forms are stored solar energy such as rainfall and wind power which are considered short-term solar-energy storage,whereas the energy in biomass(生物量) is accumulated(积聚) over a period of months, as in straw, or through many years as in wood.,Capturing renewable energy by plants, animals an
8、d humans does not permanently deplete(耗尽) the resource. Fossil fuels, while theoretically renewable on a very long time-scale, are exploited at rates that may deplete these resources in the near future.,I. Listen to the tape and answer and decide which statement Professor Chen does NOT agree with. 1
9、. Well have to stop using fossil fuels. 2. About 90% of the worlds energy comes from fossil fuels.,3. We can replace fossil fuels with renewable sources of energy. 4. Nuclear power is a good source of energy. 5. In the future, well need new technologies to replace fossil fuels. 6. Its the developed
10、countries who are to blame for producing most of the carbon dioxide.,A sample discussion Sa: I agree with Li Bin. It is the developed countries that put most of the carbon dioxide into the air, so the developed countries are really the ones to blame and to pay for that.,Sb: Well, Im afraid I disagre
11、e with you. Professor Chen is right. Whatever we do, we have to do it as a global community. Developed and developing countries should work together to improve the environment.,Sc: I hold the same viewpoint as Li Bin. In developed countries people are producing a large amount of carbon dioxide, whic
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