6. Nuclear energy is beginning to compete with coal as an economical source of power to generate electricity. It is also being used to operate engines in large ships. Scientists continue to seek new and better methods of obtaining and using energy.
23 Paragraph 3 .
24 Paragraph 4 .
25 Paragraph 5 .
26 Paragraph 6 . 醫(yī)學(xué)全在線,搜集整,理
quanxiangyun.cn A Nuclear Reactions as' the Lasting Source of the Sun's Energy
B The Most Important Source of Energy
C Types of Electromagnetic Energy
D The Machines Used for Energy Generation
E Seeking New Sources of Energy
F The Use of Ultraviolet Radiation in Medicine
27 One can get a sunburn even .
28 Infrared radiation can produce heat .
29 X-rays and gamma rays can be used to detect and treat cancer .
30 Chemical energy is generated .
A when it is absorbed by matter
B when it is cloudy, 醫(yī)學(xué)全在線搜集整,理
quanxiangyun.cn C because they can pass through solid objects
D when the sunrays are fierce
E when a change in the nucleus of an atom takes place
F when electron rearrangement takes place
參考答案：
23. C 24. B 25. A 26. E
27. B 28. A 29. C 30. F
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