单项选择题

A．At a drug store.
B．In a hospital.
C．At the police station.
D．At a hotel.
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单项选择题
A．Your eyesight.B．Your driving ability.C．The mechanical condition of your car.D．Your knowledge of traffic regulations.
A．Your eyesight.
B．Your driving ability.
C．The mechanical condition of your car.
D．Your knowledge of traffic regulations.
单项选择题
A．Successful business practices.B．Famous inventors.C．Public health concerns.D．Unsuccessful inventions.
A．Successful business practices.
B．Famous inventors.
C．Public health concerns.
D．Unsuccessful inventions.
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