单项选择题

In comparison to rail and highway, water transport is

A．greater than that of railway with respect to fixed cost
B．the middle with respect to fixed cost
C．quicker than that of rail and highway
D．to transport small tonnage at low variable cost
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单项选择题
Which of the following statements is not true according to the article
A．Steamboats are the original sailing vessels.
B．Steam power was followed by diesel power.
C．Deep-water and navigable inland water transports are equivalents.
D．There is not domestic commerce in the Atlantic Ocean.
单项选择题
Why is it difficult to say exactly how many miles of improved waterways are in operation
A．The most recent figures is for 1975 and the figure is declining.
B．Water transport's market there goes up and down frequently.
C．So few miles of inland waterways exist that no one has bothered to count them.
D．You must know whether to include coastwise and intercostals shipping in the figure.
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