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. To add cost

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单项选择题

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

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. Not clear
D. No mention