--- _________ it is to be a host!

--- I agree.

A．What a great fun

B．How great fun

C．What great fun

D．How great a fun

《高层民用建筑设计防火规范》规定，划分防烟分区的措施有（）

A.挡烟垂壁

B.隔墙

C.隔断

D.固定家具