科技英语强化听力与口语 作者 宋惠珍 成利 Unit 5.pptVIP

Question What is the main energy we use today? (both industrial household) Task 2: Discussion Task 3: Compound Dictation The invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electric power. Yet, in spite of the fact that coal has long been a source of electricity and may remain one for many years, it has actually never been the most desirable fossil fuel for power plants. Coal contains less energy per unit of weight than natural gas or oil; it is difficult to transport, and it is associated with a host of environmental issues, among them acid rain. Since the late 1960s problems of emission control and waste disposal have sharply reduced the appeal of coal-fired power plants. The cost of ameliorating these environmental problems along with the rising cost of building a facility as large and complex as a coal-fired power plant have also made such plants less attractive from a purely economic perspective. Changes in the technological base of coal-fired power plants could restore their attractiveness, however. Whereas some of these changes are evolutionary and are intended mainly to increase the productivity of existing plants, completely new technologies for burning coal cleanly are also being developed. Writing--- Graph Three types of the graph Text A 10 Easy Ways to Save on Energy at Home Discussion: What do you do to save on energy at your home? Task 1: Do the following statements agree with the information given in the passage? 1. To save on energy benefits ourselves and the environment. (Para 1) … Every time you lower your utility bills, you put more money back in your bank account. And lower energy bills also means less energy consumed, which means less harmful emissions released into our environment. … 2. If you turn off an appliance, it hardly consumes energy. 1. Minimize Phantom Loads