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
What can we learn from the passage
A．Fear and worry are dangerous.
B．Fear and worry can sometimes help us.
C．Fear and worry will cause damage unless kept under control.
D．No one can control fear and worry.
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