4. An input device used in computer games for controlling the cursor or some other symbol in its movement around a screen.
5. The software used to view, manage, and access web pages by interpreting hypertext and hyperlink.
6. The basic for creating web pages and sites, the simple coding system made up of “tags”.
7. A space empty of matter.
8. A set of instructions in a computer that changes a computer language known to the computer user into the form needed by the computer.
9. A data stucuture in which memory is allocated as a series of numberred cells.
10. An unformatted text file that contains one or more MS-DOS commands and is assigned a BAT extension.
11. A program designed to be executed from within another application.
12. A generic term for different types of computer system.
13. A remote computer connected to a host or server computer.
14.A concept that when a class of objects is defined, any subclass that is defined can inherit the definitions of one or more general classes.
15. A program that looks for documents that contain specific words or phrases.
2． In mathematic computing and computer applications, matrixes are used to arrange data into table form.
3．Deselect the text by clicking anywhere outside of the selected area on the page or pressing an arrow key on the keyboard.
4. 总线是计算机系统部件之间的电路，可以传输信号和电能。
5. 显卡是计算机的组成部分之一，它能够把视频数据转换成你在显示器上能看到的可视信息。
