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C
解析 可借助搭配句意直接确认答案C。也可借助原文(X-rays，gamma rays作为答案线索词)，在第3段倒数第3句找到答案相关句：X-rays and gamma rays have so mush energy that they travel right through solid objects．They can be used to detect and treat cancer,
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