单项选择题

According to the passage, diesel-towed barges differ from deep-water vessels in that they ______.

A．are less restricted in operation
B．are larger shipments
C．are less flexible
D．are most flexible
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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.
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.
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