单项选择题

World Wide Web is the part of the Internet that provides sounds, pictures, and moving images in addition to text. The Internet（1）computers and computer networks around the world, but the portion of the network not（ 2 ）the World Wide Web (often called the Web, for short)（ 3）only text information. The Web,（ 4 ）, has multimedia capabilities—including graphics, audio, and video. The Web is（ 5 ）electronic addresses called Web sites, which contain Web pages that hold the multimedia information. Web sites and their pages（6）in computers connected to the Internet. Tim Berners Lee, an English computer scientist at the European Center for Nuclear Research (CERN) physics laboratory near Geneva, Switzerland, wrote the Web（ 7 ）in 1990. The Web became part of the Internet in 1991. The introduction of the Web helped make the Internet（ 8 ）and easier to use. Many computer users find the Web’s multimedia content more（ 9 ）than text—only content. In addition, Web browsers make the Web easy to use. A Web（ 10 ）is a software package used to（ 11 ）and display information on the Web. To find information on other parts of the Internet requires complex software and knowledge of specific computer commands. A Web browser is easier to use because it employs a graphical user（ 12 ）— a way of interacting with a computer using pictures as well as words. The pictures represent commands in a manner that is easy to（ 13 ）. For example, a small picture of a printer（ 14 ）the command to print a document. By（ 15 ）the computer’s mouse on an element, the user gives the computer command represented by that（ 16 ）. Another major feature of the Web is hypertext. Hypertext enables a user to jump from one document to another — even if the documents are stored（ 17 ）different parts of the Internet. For example, in a Web site（ 18 ）space exploration, the words space shuttle might be（ 19 ）. Clicking on these words would bring information about the( 20 )to the screen. Pictures, too, can be used as hyperlinks (hypertext links). Words and pictures that hyperlink to other documents are called hot spots. Hot spots and their hyperlinks are created by the author of a Web page.

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