问题 单项选择题

()属于并行外部总线。

A.PCI

B.USB

C.IEEE-488

D.IEEE-1394

答案

参考答案:C

解析:

本题考查计算机系统硬件设备和接口方面的基础知识。

计算机系统中的总线一般分为内部总线、系统总线和外部总线。内部总线用于将复杂的大规模或超大规模集成电路芯片内部功能模块相连或一块模板上各个芯片之间相连接。系统总线又称为板级总线,用来连接各种插件板,以扩展系统功能的总线。在大多数计算机中,显示适配器、声卡和网卡等都是以插件板的形式插入系统总线扩展槽的。常用的系统总线有ISA总线、EISA总线、VESA总线和PCI总线等。外总线是用来连接外部设备的总线,如SCSI、IDE和USB等,可分为串行外部总线和并行外部总线。

RS-232-C总线和RS-485总线是常用的串行外部总线接口标准,IEEE-488总线是并行总线接口标准,用来将微计算机、数字电压表、数码显示器等设备及其他仪器仪表装配起来。通用串行总线(USB)是由Intel、Compaq、Digital、IBM、Microsoft、NEC和Northern Telecom这7家世界著名的计算机和通信公司共同推出的一种新型接口标准。它基于通用连接技术,实现外设的简单快速连接,达到方便用户、降低成本、扩展PC连接外设范围的目的。IEEE-1394是一种外部串行总线标准,别名火线(Fire Wire)接口,是由苹果公司领导的开发联盟开发的一种高速传送接口,它可以达到400MB/s的数据传输速率,十分适合视频影像的传输。作为一种数据传输的开放式技术标准,IEEE-1394被应用在众多的领域,包括数码摄像机、高速外接硬盘、打印机和扫描仪等多种设备。

单项选择题 A1型题
完形填空

第二节:完形填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,掌握其大意,然后从16-35各题所给的四个选项(A、B、C和D)中,选出最佳选项。

I still remember the day I was driving to the supermarket I own. When I came out, I found a boy 16 my car with a brush. I went over and patted (拍) him 17 the shoulder, which surprised him very much. In no time he began to 18 at me, so I was sure he   19 some money. From the shoes he was wearing I could hardly imagine how 20 he was. So I offered him a $100 bill. To my great surprise, he 21 to take it. When I was wondering what he was doing, he said, “I was waiting here for 4 hours, waiting for you. Your 22 is so beautiful and I like it, but I don’t need that.” I knew he was mentioning the 23.

As he had refused the money, I offered to drive him around the town. The boy became so 24 that he got into the car at once, “Would you please drive me 25? It is only about 3 miles.” What the boy wanted to do was to show off to his friends and his family.

26 I stopped, he jumped out and ran into an old building, telling me to wait there for some time. Very soon he came out, saying to a little girl on his back, “Look at this beautiful car. I will buy you 27 some day.”

I noticed his sister had a pale (苍白的) face. 28, her legs were too thin, and she was unable to 29. 

After that day I went to his home several times. And I got to know more about him and his 30. Poor as they were, the boy 31 refused my money, and said, “I can   32 money by myself, thank you.”

Soon I 33 my manager of the supermarket that a boy would go to 34 here the next day.

No matter how poor we are, we would 35 give in (屈服) to ourselves.

16. A. repairing             B. cleaning         C. fixing            D. hitting

17. A. over               B. off              C. in                  D. on

18. A. shout                B. cry                     C. smile                D. throw

19. A. lost               B. got                     C. received             D. needed

20. A. rich              B. poor            C. handsome              D. brave

21. A. begged           B. agreed           C. allowed           D. refused

22. A. car               B. shoes             C. suitcase           D. clothes

23. A. box              B. wheel            C. paper                D. bill

24. A. unhappy             B. scared         C. excited                 D. unfriendly

25. A. yard          B. office                  C. school            D. home

26. A. As soon as       B. As long as       C. As well as          D. So far as

27. A. one              B. it                  C. this                 D. that

28. A. So                B. However         C. What’s worse             D. In general

29. A. run              B. jump            C. climb                 D. walk

30. A. brother       B. family            C. friend            D. boss

31. A. no longer           B. at last          C. at first                   D. once again

32. A. spend             B. save                 C. make               D. borrow

33. A. told          B. asked            C. answered          D. warned

34. A. shop         B. work             C. sleep                   D. buy

35. A. always       B. often             C. ever                D. never