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.
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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.
填空题
S1. The reason why many production processes were taken over by the marketplace was that _____.
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