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 __________
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
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.
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
