Which of the following can be best inferred from
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Which of the following can be best inferred from the passage?
A.The importance of protection from radiation cannot be over-emphasized.
B.The mystery about radiation remains unsolved.
C.Cancer is mainly caused by radiation.
D.Radiation can hurt those who are not aware of its danger.
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答案：B
文章第二段和第四段分别提到了不同的“reasons for some of the mystery tbout nuclear radiation"，由此可以推断，核辐射仍然是一个未解之谜。