单项选择题

A．At a pharmacy.
B．At a clinic.
C．On a campus road.
D．At a grocery.
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单项选择题
Trying to quit a little at a time works better than quitting all at once.
A．Y
B．N
C．NG
单项选择题
When a cigarette is smoked, about one third of the smoke is sidestream smoke.
A．Y
B．N
C．NG
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