--I've been waiting for the phone from my uncle since 5 o'clock.

--________. He is not only a skillful driver but he also knows the road very well.

A．How long has he been away?

B．What's the matter with him?

C．I don't think you should worry about him.

D．I'm afraid there's something wrong with the telephone.

不符合生理性收缩期杂音的是

A．性质粗糙

B．强度≤2/6级

C．时间短促

D．无震颤

E．儿童、青少年多见