单项选择题

A．Paging companies.
B．Television and radio broadcasts.
C．Computer users.
D．Household equipment.
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单项选择题
A．At a bookstore.B．At a bank.C．At a club.D．At a grocery store.
A．At a bookstore.
B．At a bank.
C．At a club.
D．At a grocery store.
单项选择题
A．Breakdown of public health.B．International travel and commerce.C．Man’s eating habits.D．Processing methods of food.
A．Breakdown of public health.
B．International travel and commerce.
C．Man’s eating habits.
D．Processing methods of food.
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