單項選擇題

（）creates time value.

A. Transportation
B. Good flow
C. Different location
D. Storage

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單項選擇題

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

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

單項選擇題

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