单选题：Paragraph 6__________

题目分类：卫生类
题目类型：单选题
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题目内容：

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．The machines used for energy generation
E．Seeking new sources of energy
F．The use of ultraviolet radiation in medicine

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