单项选择题

An appropriate title for this passage would be ______.

A．On the inaccuracy of Pulp Magazine
B．Man and the Universe
C．Toward a Definition of Science Fiction
D．A Type of Prose Fiction
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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
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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