--- I was late for school this morning.

---_______ You started early, didn’t you?

A．Why not?

B．So what?

C．How come?

D．Never mind.

诊断主动脉瓣关闭不全最重要的体症是（）

A.心尖区第一音减弱

B.靴形心

C.主动脉瓣区舒张期杂音

D.心尖区austinflin杂音

E.水冲脉