| 1.A （ ） computer is a personal computer whose hardware is capable of using any or all of the following media in a program : audio,text,graphics,video and animation. |
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| 2.The （ ） in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America. |
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| 3.A computer virus is a computer program that is created to make and spread ( ) of itself. |
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| 4.The OSI model has ( ) layers. |
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| 5.( ) is a device that enables the computer to handle sounds. |
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| 6.One use of networks is to let several computers share （ ） such as file system,printers,and tape drives. |
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| 7.A （ ） infected computer may lose its data. |
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| 8.The Internet is an open system, and most information is available to everyone. It is very important to add （ ） to existing system for protecting the secret information. |
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| 9.Which of the following expressions is true about the Internet? |
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| 10.One of the basic rules of computer security is to change your （ ） regularly. |
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| 11.The ( ) is a collection of computers connected together by phone lines allows for the global sharing of information. |
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| 12.Most （ ） measures involve data encryption and password. |
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| 13.The display screen is the most common ( ) device used to show you what the computer is doing. |
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| 14.The source code of a Web page consists of ( ). |
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| 15.（ ）：Messages that are sent electronically over a network. |
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| 16.Anti-Virus protects your computer from viruses by ( ) your computer's memory and disk devices. |
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| 17.( ) is used to communicate with another computer over telephone lines. |
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| 18.One of the greatest features of a home （ ） is the ability to share one Internet connection simultaneously over two or more computers. |
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| 19.Multimedia is a ( ). |
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| 20.The best way to describe the concept of playing a guitar is use of ( ). |
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