概括大意與完成句子(第23～30題，每題1分，共8分)
下面的短文后有2項測試任務：(1)第23～26題要求從所給的6個選項中為第3～6段每段選擇1個標題;(2)第27～30題要求從所給的6個選項中為每個句子確定1個選項。
23. Paragraph 3 __________
24. Paragraph 4 __________
25. Paragraph 5 __________
26. Paragraph 6 __________
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.
下面的短文后有2項測試任務：(1)第23～26題要求從所給的6個選項中為第3～6段每段選擇1個標題;(2)第27～30題要求從所給的6個選項中為每個句子確定1個選項。
23. Paragraph 3 __________
24. Paragraph 4 __________
25. Paragraph 5 __________
26. Paragraph 6 __________
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.