The mayor has announced a plan recently       water pollution of the city.

A．prevent

B．preventing

C．to prevent

D．prevented

有减少呼吸道分泌作用的麻醉前用药是（）

A.阿托品

B.苯巴比妥钠

C.地西泮（安定）

D.哌替啶

E.氯丙嗪