| 1.You might work for an organization whose computer system is spread ( ) a building. |
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| 2.Anti-Virus protects your computer from viruses by ( ) your computer's memory and disk devices. |
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| 3.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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| 4.Which of the following expressions is true about the Internet? |
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| 5.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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| 6.A （ ） is used to communicate with another computer over telephone lines. |
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| 7.（ ）：Messages that are sent electronically over a network. |
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| 8.One use of networks is to let several computers share （ ） such as file system,printers,and tape drives. |
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| 9.( ) is not a linear structure. |
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| 10.The RGB value is composed of ( ) components. |
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| 11.Photoshop is the leading professional ( ) program, released by Adobe. |
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| 12.Modem is ( ). |
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| 13.The firewall device is a （ ） system for connecting a computer network to other computer network. |
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| 14.Multimedia will become increasingly ( ) throughout every aspect of our lives. |
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| 15.With （ ） you can communicate in real time with people all around the world． |
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| 16.Most （ ） measures involve data encryption and password. |
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| 17.Computer （ ） is a complex consisting of two or more connected computing units， it is used for the purpose of data communication and resource sharing. |
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| 18.One of the basic rules of computer security is to change your （ ） regularly. |
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| 19.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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| 20.Virus is a ( ). |
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