单项选择题
What is the meaning “cost-effective”? （）
A. cost reduce
B. cost increase
C. effective
D. efficient
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相关考题
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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 -
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 -
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
