Today, the world wide web can be used both to 【C1】______ information and to make it 【C2】__

____ to others. Information 【C3】______ on webpages is viewed 【C4】______ means of browser. The sources of information linked in this way can be located on any computer 【C5】______ is also part of the web. Each information source 【C6】______ to an indefinite number of other webpages. Hypertext and hyperlinks allow users acting as receivers of information to 【C7】______ from one source of information to 【C8】______ , 【C9】______ for themselves which information they wish to 【C10】______ to their browser and which links they want to 【C11】______ .

The addresses of webpages can be found by using the many hundreds of general and specialized search engines which provide 【C12】______ to databases which hold information on them. Once a webpage has been found, hyperlinks may point 【C13】______ other places of interest on the web. Addresses of webpages also 【C14】______ in other more conventional media, such as magazines, newspapers and television programs, and on posters. Webpages, in their 【C15】______ , facilitate access to information made available by other 【C16】______ of media, for example, collections held in libraries or programs broadcast on television.

Most webpages offer interactive opportunities which go 【C17】______ merely allowing visitors freedom as to when and how they visit a page and where they might choose to go next. Feedback can be kept formal via a questionnaire which can be filled 【C18】______ , or 【C19】______ by providing an address for e-mail or even by installing a digital guest book for comments left for other users to read. Although all webpages are protected 【C20】______ unauthorized visitors cannot make unsolicited changes to them, it is also possible to limit access to pages on the Internet to those holding a password.

【C1】

A．achieve

B．retrieve

C．receive

D．perceive