Вопрос № 223160 - Английский язык

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Telephone lines were designed to carry the human 1_______, not electronic data from a computer. Modems were invented to convert 2_______ computer signals into a form that allows them to travel over the 3_______ lines. Those are the scratchy sounds you hear from a modem’s speaker. A modem on the other end of the line can understand it and 4_______ the sounds back into digital information that the computer can understand. By the way, the word modem stands for MOdulator/DEModulator.

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Your computer will use your normal telephone line to transport data while you are connected. There is no need to have a second line installed, though there are some obvious disadvantages to having only one line. The size of your telephone line can also seriously affect the quality and speed of your access. A couple of alternatives to the traditional telephone connection are described in Chapter 4 in the section on access speeds.

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The system of newsgroups is a worldwide network of open discussion groups on thousands of subjects. They are 'open' in that they are not usually supervised or moderated and can be read by anyone that is interested. They are interesting spaces for debate, and there are several dedicated to educational themes.

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Chat: This kind of program is a popular way to communicate in real time, that is, instantaneously. Whatever you type into a chat program is immediately visible to the other participants on their computers. You can chat to strangers from around the world who share your hobbies or interests, or even arrange to meet family or friends for a virtual reunion.

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When you first open your browser it will often connect to the Internet automatically, taking you right onto the Web. The web page that opens each time you connect is the browser's home page, the index page of your program's web site, so that you can get instant help and bulletins about updates to the software you are using.
You will notice that the browser creates a kind of frame around the web page you are viewing. The top part of the frame, which has drop-down menus and a toolbar, looks a bit like a word-processing program.

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Directories use an indexing strategy that makes them distinct from other search tools. They use real live people to search the Web, and to review and categorize the sites by topic. This reduces some of the aggravations that frequently plague the researcher, such as duplication of listings, broken links and out-of-date information. A perfect choice when you have very little idea what is out there, directories are set up to satisfy expert and inexperienced users alike. This is why Yahoo!, one of the pioneer directory sites, is consistently ranked number one in Internet polls.