| 1.The OSI model has ( ) layers. |
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| 2.（ ）：Messages that are sent electronically over a network. |
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| 3.The source code of a Web page consists of ( ). |
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| 4.Virus is a ( ). |
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| 5.( ) is a device that enables the computer to handle sounds. |
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| 6.The Internet is the world's largest computer （ ）. |
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| 7.A computer virus is a computer program that is created to make and spread ( ) of itself. |
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| 8.( ) is used to communicate with another computer over telephone lines. |
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| 9.The display screen is the most common ( ) device used to show you what the computer is doing. |
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| 10.The usual address for a Web site is the （ ） page address, although you can enter the address of any page and have that page sent to you. |
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| 11.You might work for an organization whose computer system is spread ( ) a building. |
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| 12.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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| 13.The RGB value is composed of ( ) components. |
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| 14.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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| 15.With （ ） you can communicate in real time with people all around the world． |
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| 16.The best way to describe the concept of playing a guitar is use of ( ). |
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| 17.A （ ） is used to communicate with another computer over telephone lines. |
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| 18.A firewall is a （ ） system designed to protect an organization’s network against threats. |
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| 19.Multimedia will become increasingly ( ) throughout every aspect of our lives. |
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| 20.Communication through the Internet, the ( ) performs the reverse function. |
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