单项选择题

Currently， different types of multimodal transport operations involving different combinations are taking place.（）transport does not refer to multimodal transport.

A.Sea/air
B.Sea/road
C.Sea/rail
D.Sea/sea

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单项选择题
（） constitutes the principal mode of international transport and carries about 90 percent of international trade in terms of volume.

A.Rail/road transport
B.Airfreight
C.Multimodal transport
D.Marine cargo transportation
单项选择题
In practice， a set of（）original bills of lading is the most common.

A.one
B.two
C.three
D.four
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