—I heard that it took many people five days to _______ the forest fire.

—Oh, that's terrible! [ ]

A. put on

B. put up

C. put out

D. put away

空旷的地面上有一噪声源，距离它10米处测得声压级为Lp，如果噪声源声功率增加一倍，其它条件不变，同样位置处测得的声压级为（）。

A、2Lp；

B、10Lp；

C、3+Lp；

D、视噪声源声功率具体数值而定。