缓解城市噪声的最好方法是下列哪一项()A．减少私人小汽车的数量_爱下问搜题

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问题单项选择题

缓解城市噪声的最好方法是下列哪一项()

A．减少私人小汽车的数量

B．设置水体作为声障或种一排树

C．提供大尺度景观作为屏障

D．增加噪声源与受声点的距离

答案

参考答案：D

选择题

Principal White has been working in the school for about 20 years, all his energy to teaching and

researching as well as the running of a healthy school. [ ]

A. devoted

B. devoting

C. to devote

D. and devote

填空题

分解因式：m²-6m+9=______．