3. Period:65

4. Water Power Hydroelectric dam

5. Windmill Wind power

9. reactor /ri:'æktə/ ( n) : lò phản ứng limited /'limitid/ ( adj ) : hạn chế, có giới hạn unlimited / ʌ n'limitid/ (adj): không giới hạn renewable /ri'nju:əbl/ (adj ) : có thể thay thế non-renewable /,n ɔ n 'ri'nju:əbl/ (adj ): không thể thay thế

10. Task 1. The following statements list some advantages and disadvantages of various sources of energy. Read and tick ( ) the appropriate box A ( for the advantages ) or D (for the disadvantages ), then compare the results with partner’s. AD 1.Fossil fuels will be exhausted within a relatively short time. 2.Geothermal heat is available only in the few place in the world. 3.If the wind does not blow, there is no wind energy. 4. Water power provides energy without pollution. 5.A nuclear reactor releases radiation which is dangerous to the environment. 6. Solar energy is not only plentiful and unlimited but also clean and safe. 7.It is expensive to built a dam for hydroelectricity.

11. Task 2: Work in pairs. Talk with your friend about the advantages and disadvantages of using each alternative sources of energy, using the suggestions from Task 1. Why do you think so? I think that wind power can be an alternative source of energy.......

12. Sources of energy AdvantagesDisadvantages Nuclear energy Geothermal heat Solar energy Wind power Water power It is available It can be dangerous It is unlimited It is not only plentiful and infinite but also clean and safe It is clean and unlimited It is clean and unlimited It is only available in some places It is only possible during the day time If the wind doenn’t blow,there is no wind no energy. It is expensive to built a dam for hydroelectricity

13. A: I think that can be an alternative sources of energy. B: Why do you think so? A: Because our major sources of energy are running out while Example : wind power (1) the wind is abundant and unlimited. (2) it is also clean and safe to the environment. (3) it is not available when there is no wind. (4) However, B: I know

14. A: I think that _______(1)___________ can be an alternative source of energy. B: Why do you think so? A: Because our major sources of energy are running out while __________(2)____________. However, _________(4)_____________. B: I know ___________(3)____________. (1): solar energy (2): solar energy is plentiful and infinite. (3): It is also clean and safe to the enviroment. (4): It is only possible during the day time.

15. A: I think that solar energy can be an alternative sources of energy. B: Why do you think so? A: Because our major sources of energy are running out while the solar energy is plentiful and infinite. However, it is only possible during the day time. B: I know it is also clean and safe to the environment.

16. A: I think that _______(1)___________ can be an alternative source of energy. B: Why do you think so? A: Because our major sources of energy are running out while __________(2)____________. B: However, _________(3)_____________. (1): nuclear power (2): nuclear power is unlimited (3): It can be very dangerous. A nuclear reactor releases radiation which is harmful to the environment.

17. A: I think that _______(1)___________ can be an alternative source of energy. B: Why do you think so? A: Because our major sources of energy are running out while __________(2)____________. However, _________(4)_____________. B: I know ___________(3)__________________. (1): water power (2): water is unlimited (3): It also provides energy without pollution. (4): It is expensive to build a dam for hydroelectricity

18. A: I think that _______(1)___________ can be an alternative source of energy. B: Why do you think so? A: Because our major sources of energy are running out while __________(2)____________. However, _________(3)_____________. B: (1): geothermal heat (2): this heat is available. (3): It is possible only in a few places in the world.