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單項(xiàng)選擇題

What is the meaning “speed is not of primary importance”?（）

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

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單項(xiàng)選擇題

What are transported mainly by water?（）

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

單項(xiàng)選擇題

How many categories are there in water transport?（）

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

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