单项选择题
A.Less than 1% B.Lowest C.Lower D.Low
What kind of products do the air carriers deliver? （）A....
单项选择题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
What is the disadvantage for air transportation?（）A.Qui...
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
What is the meaning of “short hauls”?（）A.Near way ...
单项选择题What is the meaning of “short hauls”?（）
A.Near way B.The distance is not long C.Direct line D.Short road
