How should we understand the social benefits of a sustainable transportation system?A.It s

学历类 专四 已帮助 人

How should we understand the social benefits of a sustainable transportation system?

A.It should be efficient.

B.It should be safe.

C.It should be friendly.

D.It should be constructive.

请帮忙给出正确答案和分析,谢谢!

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