-Are you glad to hear from her?

-Of course. ________， we last met more than thirty years ago.[ ]

A．What's more  

B．That is to say

C．In other words  

D．Believe it or not

工作信号是（）方式的开车信号及停车信号。

A、提人信号

B、提矸信号

C、能区分各种作业

D、提设备信号