单项选择题

This article is mainly about ______.

A．the weight of a whale's brain
B．the brains of geniuses
C．the size of a person's brain and his intelligence
D．the intelligence of the elephant
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单项选择题
If nuclear bombs are dropped on an area the survivors will ______.
A．hide in their houses
B．store more food
C．be very sick
D．grow more crops
单项选择题
Radiation ______.
A．is good for crops
B．can poison food and water
C．is not harmful to man
D．is useful to man
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