单项选择题

Radiation can hurt us in that it can ______.

A．affect the healthy growth of our offspring
B．damage cells which may grow into cancer years later
C．kill large numbers of cells in main organs so as to cause death immediately
D．all of the above

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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.