单项选择题

According to the author, the danger of nuclear power lies in ______.

A．nuclear mystery
B．radiation detection
C．nuclear radiation
D．radiation level
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单项选择题
The word significant in Paragraph 3 has the similar meaning with ______.
A．fatal
B．meaningful
C．harmful
D．remarkable
单项选择题
What is the author's main purpose in writing this passage
A．Emphasizing the importance of protection from radiation.
B．Solving the mystery about radiation.
C．Discussing the cause of cancer.
D．Introducing the nuclear power.
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