单项选择题

（）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. Not clear
D. No mention

单项选择题

A. 750 miles
B. 1000km
C. 1000 miles or less
D. 200 km