—I like this set of sofa so much, but I don't know ________ it in my small house.

—You're supposed to put it in the living room. [ ]

A. where to put

B. why to put

C. how to put

最可能发生晕厥的心脏瓣膜病是（）

A.二尖瓣狭窄

B.主动脉瓣狭窄

C.肺动脉瓣狭窄

D.二尖瓣关闭不全

E.主动脉瓣关闭不全