单项选择题

A．He was kept in hospital for a long time.
B．He was slightly injured in a traffic accident.
C．He was seriously wounded in a mine explosion.
D．He was fined for speeding.
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单项选择题
We can infer from the last paragraph that ________.
A．smokers should not expect to become airline pilots
B．smoking in emergency cases causes mental illness
C．no airline pilots smoke during flights
D．smokers may prove unequal to handling emergency cases
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