第3部分：概括大意与完成句子(第23～30题，每题1分，共8分)
下面的短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第3～6段每段选择1个最佳标题；(2)第27～30题要求从所给的6个选项中为每个句子确定1个最佳选项。
23. Paragraph 3 __________
24. Paragraph 4 __________
25. Paragraph 5 __________
26. Paragraph 6 __________
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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．X-rays Are Used to Detect and Treat Cancer．
E．Seeking New Sources of Energy
F．Nuclear Energy is Beginning to Compete with Coal
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27. Visible light that produce warmth is an example of __________．
28. We can use energy from the sun because __________．
29. The energy stored in coal __________．
30. __________ when electron rearrangement takes place.
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A．electromagnetic energy
B．electromagnetic energy travels through space
C．came from the sun
D．when a change in the nucleus of an atom takes place
E．when the sunrays are fierce
F．chemical energy is generated
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