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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单项选择题

A. The high value
B. Low density or weight
C. A and B
D. To add cost

单项选择题

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

A. Near way
B. The distance is not long
C. Direct line
D. Short road