胸骨左缘第二肋间触及连续性震颤，常见病变为 （）

A.动脉导管未闭

B.肺动脉瓣狭窄

C.房间隔缺损

D.室间隔缺损

E.主动脉瓣狭窄

—Why do you suggest we buy a new machine?

—Because the old one has been damaged ______.

A．to repair

B．beyond repair

C．in repair

D．under repair