According to the public notice from the police station, ____$5,000 reward will be offered for ____ return of the stolen cultural relics.

A．a; the

B．/; the

C．a; a

D．/; a

新一代天气雷达在暴洪预报中的作用有（）。

A.雨强估计

B.低空急流识别

C.次流域面积上累计降水估计

D.水汽条件判断

E.降水持续时间估计