It's a great____________ for her to go to London, and she enjoyed herself there.    [ ]

A. surprise      

B. pleasure    

C. honour      

D. treat

引起心源性休克最常见的病因是（）.

A.急性肺动脉栓塞

B.急性心肌梗死

C.扩张型心肌病

D.急性肺水肿

E.急性心脏压塞