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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单项选择题
Sickness and starvation will be results of ______.
A．a nuclear war
B．nuclear weapons
C．a deficiency of food
D．a shortage of medicine
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
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