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

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.

单项选择题

What can we infer from the passage

A．We can't detect radioactivity even with modern equipment.
B．Only radiation at very high levels can kill an animal or human being.
C．If a few cells are only damaged, healthy cells will take the place of dead ones.
D．Radiation is harmful no matter what level it is.