—What do you think of the manager of your company?

—Oh，he is ________ manager who's pleasant to work with.It's ________ pleasure to work with him.

A．the；a

B．a；a

C．a；the

D．/；a

地下民用建筑的疏散走道，其顶棚、墙面和地面的装修材料采用燃烧性能为（）级装修材料。

A.A

B.B1

C.B2

D.B3