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B
解析 thesun是该段的核心词，所以初步判定A是答案，但该段并没有提到A中说的“核反应”，所以排除A，借助该段中的第2句(The source of most of our energy is the sun．我们最重要的能源是太阳)，判定答案为B。
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