单项选择题

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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单项选择题

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

单项选择题

A.Yes
B.Depend
C.No
D.I don’t know

单项选择题

A.Great amount of shipped
B.Tracks
C.Logistics
D.Ships