问题
单项选择题
（）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
答案
参考答案：A
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（）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
参考答案：A