單項(xiàng)選擇題

Where is the most air freight shipped in the passenger aircraft?（）

A. separately
B. Not clear
C. In the lower part
D. Not mention here

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單項(xiàng)選擇題

How much is the percent of air transportation in all modes? （）

A. Less than 1%
B. Lowest
C. Lower
D. Low

單項(xiàng)選擇題

what kind of products do the air carriers deliver? （）

A. The high value
B. Low density or weight
C. A and B
D. Shortest time to transport