编写汇编语言程序时，下列寄存器中程序员可访问的是（）

A．程序计数器(PC)

B．指令寄存器(IR)

C．存储器数据寄存器(MDR)

D．存储器地址寄存器(MAR)

Speaker A: Excuse me, could you tell me how to get to the railway station
Speaker B: （）。

A. Yes, of course I can.

B. Well, you’d better not ask a stranger.

C. Sorry. I’m a stranger here myself.

D. Yes, you can take a taxi. It’s more expensive, but it’s quicker.