问题 单项选择题

PC机通过下列哪一条途径启动硬件中断服务程序执行

A.主程序中安排的中断指令

B.中断控制器发出的中断请求信号

C.主程序中安排的转移指令

D.主程序中安排的调用指令

答案

参考答案:B

解析: 在不同类型的中断中,软中断(也称内中断)是由于执行程序中某些指令引起的;而硬中断(也称外中断)则是由处理器以外的其他控制电路发出的中断请求信号引起的。

阅读理解

根据短文内容,判断下列句子的正误,正确的用“T”,错误的用“F”。

     There are many books for young readers. Some of these are for children from 12 to 18. Others are for

those who are under 12. There are even some books for babies.

     Books for young children use a lot of beautiful pictures. They are a big part of each book. So many

writers of children's books also draw the pictures. These writers make sure that their books are more than

just fun stories to read. They make them look good, too!

     Some children's books tell very old stories. Many have animals in them that talk and do things that people

do. Some of these animals might be bears. Others might be foxes. A little mouse and a big lion might even be

in the same story.

     Many books for very little children are all pictures. Others may have a word here and there. Books for

babies may have something to push that makes sounds. This kind of book may make animal sounds. Then

it may have a picture of the animal that makes each sound. It may also have its name. This way, the baby

gets to know what sounds some animals make.

( )1. We have many books for both teenagers and little kids.           

( )2. In children's books, animals can talk to readers like real people.

( )3. Some books-for babies have pictures with a few words.           

( )4. Babies can also learn something from books.                      

( )5. The passage is mainly about different books for people of all age.

问答题 简答题