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單項(xiàng)選擇題

What is the meaning “cost-effective”? （）

A. cost reduce
B. cost increase
C. effective
D. efficient

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

（）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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