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

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