单项选择题

A．Doctor and patient.
B．Passenger and bus driver.
C．Daughter and mother.
D．Customer and merchant.
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单项选择题
The passage gives an insight into how the United States could develop a new transport policy for the 21st century.
A．Y
B．N
C．NG
单项选择题
A．$240.B．$290.C．$250.D．$200.
A．$240.
B．$290.
C．$250.
D．$200.
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