單項選擇題

Railroads own about （）of their car fleet.

A.Half
B.80%
C.20%
D.Not mentioned

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單項選擇題

The advantage of rail transport is （）

A. Great amount of shipped
B. Less damage ration
C. Fast speed, exact schedule, and cost saved
D. Direct shipping line

單項選擇題

The disadvantage above mentioned can be overcome by （）

A. combined transport
B. More frequency
C. Fast train
D. More flexible

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