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

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单项选择题

Which of the following transportation mode has the most flexibility（）

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

单项选择题

Which of the following can be transported by pipeline（）

A．coal
B．gas
C．fuel
D．electricity

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