2. 外语
  3. A. Nuclear reactions as the lasting source of the sun’s energy. B. The most important source of energy. C. Types of electromagne

A. Nuclear reactions as the lasting source of the sun’s energy. B. The most important source of energy. C. Types of electromagne

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问题 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.
*
选项
答案F
解析 借助问题句中的特征词chemical energy作为答案线索词，在第5段倒数第4句找到答案相关句：Chemical energy comes from electron  (电子)  rearrangement，确认答案为F。
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