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

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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

單項(xiàng)選擇題

What is the disadvantage for air transportation? （）

A. Quick but not safe
B. Less frequency
C. It can’t lift heavy goods
D. The highest cost in all transport modes