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單項選擇題

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

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單項選擇題

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

單項選擇題

What is the meaning of “short hauls”?（）

A.Near way
B.The distance is not long
C.Direct line
D.Short road