问题
单项选择题
下列说法中错误的是( )。
A．统一编址方式即把I/O端口当作主存储器的单元来分配地址
B．统一编址方式下不需要专门的I/0指令
C．统一编址方式下指令系统的实现比单独编址方式复杂
D．采用统一编址方式会减少主存的编址空间
答案
参考答案：C
解析：统一编址方式下不需要专门的I/O指令，因而简化了指令系统，其指令系统的实现比单独编址方式简单。
搜题请搜索小程序“爱下问搜题”
下列说法中错误的是( )。
A．统一编址方式即把I/O端口当作主存储器的单元来分配地址
B．统一编址方式下不需要专门的I/0指令
C．统一编址方式下指令系统的实现比单独编址方式复杂
D．采用统一编址方式会减少主存的编址空间
参考答案：C
解析：统一编址方式下不需要专门的I/O指令，因而简化了指令系统，其指令系统的实现比单独编址方式简单。
| 完形填空。 | ||
| Mr. Smith 1 in a post office three years ago. When he was sixty, he retired. Now he and his wife stay at home and his children work in 2 city. The old man does all housework and he has nothing to do at home. He likes neither reading nor 3 games. At first he didn't know how to 4 the free time. Mr. Hunt 5 was two years older than him asked to go fishing with him. "It's a good sport," said Mr. Hunt. "I'm sure you'll soon be 6 in it." "That's easy. Go fishing with me tomorrow morning and I'll 7 you." Mr. Smith decided 8 his luck. The following day the two old friends came to a river and began to fish. Suddenly Mr. Smith said, "I say, 9 do those little red things cost?" "You mean the floats (浮子)? Oh, they're cheap. What made you ask me such a 10 ?" "I owe (欠) you for one. Mine has just sunk (下沉)." | ||
| ( )1. A. work ( )2. A. other ( )3. A. playing ( )4. A. spend ( )5. A. who ( )6. A. interesting ( )7. A. discover ( )8. A. trying ( )9. A. how many ( )10. A. problem | B. worked B. the other B. play B. take B. which B. interested B. teach B. to try B. how far B. answer | C. works C. another C. plays C. cost C. what C. interest C. follow C. tried C. how much C. question |