— Do you know _________?      —No, I don’t know.

A．where he’s from

B．where is he come

C．where does he come from

D．where comes he from

引起猝死的常见严重心律失常是（）。

A.频发性室性早搏

B.心房扑动

C.室上性阵发性心动过速

D.心室颤动

E.心房颤动