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问题 单项选择题

引起中断的中断源统称分为5种，它们是：I/O中断、时钟中断、故障中断、程序中断和 ( )。

A．存取中断

B．溢出中断

C．校验中断

D．数据信道中断

答案

参考答案：B

补全对话，情景问答
Read and answer. (找答语，将右栏答语前的序号填在前面的括号里。)
                     A                      
( )1. Welcome to our school.        
( )2. How much is the nice shirt?    
( )3. Is this a teacher’s desk?    
( )4. What are these?                
( )5. What time is it?              
( )6. How old are you?              
( )7. Let’s go to the playground.  
( )8. How many cows do you havew?    
( )9. What’s the weather like today?
( )10. Whose dresses are those?      		           B                    
A. It’s 7 o’clock.      
B. Thirty yuan.            
C. Great!                  
D. I’m eleven.            
E. It’s sunny.            
F. They are my mother’s.                                           
G. Thank you.              
H. They are hens.          
I. Yes,it is.              
J. I have nine.            
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