—Excuse me, which is the way          the hospital?    

—Walk           the street. Take the first turning on the right and walk on. You'll see it          the end of the road.    [ ]

A. for; down; by                  

B. of; down; at    

C. to; along; at                    

D. to; along; by

大中型电子计算机房、中央控制室、电话总机房等放置特殊贵重设备的房间，其顶棚、墙面应采用（）装修材料。

A、A级

B、B1级

C、B2级

D、B3级