下面叙述正确的是( )。
A．在中断过程中，若有中断源提出中断，CPU 立即实现中断嵌套
B．在中断响应中，保护断点、保护现场应由用户编程完成
C．在中断响应中，保护断点是由中断响应自动完成的
D．简单中断，中断是由其他部件完成，CPU 仍执行原程序
参考答案：C
解析：[分析] 在中断响应中，保护断点是由中断响应自动完成的；只有当中断屏蔽开，而且中断请求比当前中断优先级高，才会产生嵌套中断；保护断点、保护现场是操作系统应该考虑的问题；中断由CPU负责处理。
阅读下面短文，掌握大意，然后从每题所给的A、B、C、D四个选项中选出最佳选项。 Look! __ is my friend. Her _ is Meimei. Well, can you _ it? Yeah! M-e-i,m-e-i. She is thirteen _ old. She studies in No.1 Middle School. She is _ new student here. There _ eighteen boys and fifteen girls in her class. Her mother a teacher. She is an teacher. Her father, Mr Wang is a teacher, . Their students all love them because they love their students. They have(有)a dog. The dog and Meimei are ___ friends.
|
