单项选择题

A．Good health.
B．Gold and silver.
C．Your best friend.
D．How to control serious diseases.
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单项选择题
A．In about 20 years.B．Within a week.C．In a couple of weeks.D．As early as possible.
A．In about 20 years.
B．Within a week.
C．In a couple of weeks.
D．As early as possible.
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