题目内容

（）是I/O系统中最低的一层，它是整个I/O系统的基础。

A. 设备独立性软件
B. 设备驱动程序
C. 中断处理程序
D. 用户层软件

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对于中断处理程序，以下不正确的叙述是（）。

A. 中断处理过程中系统的控制权会交给中断处理程序
B. 在中断处理开始前，应先保存被中断进程的CPU环境
C. 不同的设备对应不同的中断处理程序
D. 当中断处理结束后会返回被中断的程序

________是指由CPU内部事件所引起的中断。

Hi, Anna, how’s it going?Not too bad. I haven’t seen you for some time. What have you been doing lately, Jason?Same as usual, I’m still busy with my work. You know, working in one of the world’s top 500 companies is quite demanding.How long have you been working in this company?Over two years.Are you satisfied with your present job?Yes, I am quite pleased with it. I have a big office, some helpful colleagues, and an open-minded boss. There is nothing to complain about.It seems that you have a lot of fun at work.Yes, it’s just what I wanted from work.You are really lucky!(1)What hasJason been doing lately?(2)How long hasJason been working in this company?(3)Is he satisfied with his job? Why?

Ann: Hi, Betty! How was your dinner last night?Betty: Great! My friend and I like it very much. Thanks for your recommendation.Ann: Oh, really? Could you tell me why you like it?Betty: The restaurant is filled with a cozy atmosphere and it is quite relaxing to be there.Ann: Yes, I have the same feeling with you.Betty:Moreover, the food is very delicious and the service is pretty good.Ann: Yeah, I totally agree with you.(1) Who recommend Betty and her friend to enjoy their dinner last night?(2) The reasons why Betty likes it?