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