单项选择题

A．On television.
B．At registration.
C．In class.
D．At work.
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单项选择题
A．Children under 16B．Men between 20 and 33 years oldC．WomenD．Old people with serious diseases
A．Children under 16
B．Men between 20 and 33 years old
C．Women
D．Old people with serious diseases
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