单项选择题

Railroads own about （）of their car fleet.

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

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单项选择题

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

单项选择题

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

单项选择题

A. Cost
B. Speed
C. Lost and damage ratios
D. Transit time and frequency of service