—May I speak to Mr. Smith?

—Sorry. He isn’t here right now. _____ [ ]

A. Can I take a message?

B. Can you take a message?

C. Can I leave a message?

D. Can you hold the line?

二尖瓣狭窄时提示肺动脉高压的体征是：（）

A.开瓣音

B.心尖部舒张期杂音出现得晚

C.第一心音亢进

D.心界明显扩大

E.肺动脉瓣第二心音亢进、分裂