单项选择题

Which area is the most commodities shipped in water transport?（）

A. In international deep sea
B. In lakes
C. In river and canals
D. Coastal ocean

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单项选择题

A. Speed is important
B. Speed is not the most important
C. Speed is mainly important
D. Speed is first important

单项选择题

A. Raw materials
B. Heavy, bulky and low value commodities
C. Semi-processed
D. Great amount goods

单项选择题

A. 2
B. 3
C. 4
D. Not available in the paragraph