单项选择题

A．A library.
B．A publishing house.
C．A museum.
D．A bookstore.
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单项选择题
There is an aging sign when feeling sad from time to time.
A．Y
B．N
C．NG
单项选择题
A．Having selected food types.B．Eating vegetables and fruits.C．Eating as much as possible.D．Having all food types in proper proportions.
A．Having selected food types.
B．Eating vegetables and fruits.
C．Eating as much as possible.
D．Having all food types in proper proportions.
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