单项选择题

A．Brush your teeth right before you go to bed in the evening.
B．Have as few of your teeth pulled out as possible.
C．Have your teeth X-rayed at regular intervals.
D．Clean your teeth shortly after eating.
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单项选择题
A．It has many big and beautiful parks.B．It possesses many historical sites.C．It is a city of contrasts.D．It is an important industrial center.
A．It has many big and beautiful parks.
B．It possesses many historical sites.
C．It is a city of contrasts.
D．It is an important industrial center.
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