單項(xiàng)選擇題If a shipper has strict arrival and departure requirements, which kind of transport mode he should consider firstly?()

A.Railroad
B.Motor
C.Both of them 
D.Neither of them


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1.單項(xiàng)選擇題()are respectively the dominant transport mode in China and in the United States.

A.Rail and motor
B.Motor and rail
C.Rail and rail
D.Water and rail