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
According to the passage, if an air plane has an accident-free record, it usually pays to the insurance company ______.
A．a large premium
B．less premium
C．no premium
D．the same premium as the other companies
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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