单项选择题

What is man's intelligence decided by

A．A large brain.
B．A small brain.
C．The environment.
D．Not precisely mentioned here
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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
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
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