---On summer nights the weather is usually very hot.

---Yes, so I often go to sleep ______ the windows ______.

A．with, on

B．have, open

C．with, open

D．with, closed

主动脉瓣狭窄致猝死的常见原因（）。

A.心排血量不足致脑供血不足

B.急性心肌缺血致心室纤颤

C.在主动脉瓣口面积1cm左右时出现

D.急性左心衰竭

E.急性心肌缺血致心肌梗死