Sending a truck load of sand by air is a waste of money.
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All shippers prefer shorter transit time because it can reduce cost。
A. 对
B. 错
Rail transportation is more expensive than road.
A. 对
B. 错
Safety concern mainly refers to protecting goods from being stolen.
A. 对
B. 错
Traditional modes of transportation include rail, road, air or water and they all have advantages and disadvantages.
A. 对
B. 错