单项选择题

In the long run, air transport will increase its proportion gradually because of （）

A．the demand of newest
B．the demand of effectiveness
C．the demand of quick
D．the demand of efficiency

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单项选择题
If we want to transport goods with large tonnage over along distance,we can choose （）

A．water
B．truck
C．railway
D．pipeline
单项选择题
Which of the following transportation mode has the most flexibility（）

A．highway
B．railway
C．aircraft
D．railway
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