问题
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
答案
参考答案：D
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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
参考答案：D