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1___________________________________. This needed a free and independent communication network without a centre. 2_____________________________________.
The WWW became available to everyone in 1991. 3____________________________________. Today, that number is much larger and there are now many browsers that provide Web pages, information and other services. 4___________________________________.

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The World Wide Web (WWW) became available to everyone in 1991 and the number of Internet users grew from 600,000 to 40 million in five years. Today, that number is much larger and there are now many browsers that provide Web pages, information and other services. You can also do research, download music files, play interactive games, shop, talk in chat rooms and send and receive e-mail on the WWW.

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1__________________________________. Search engines have a text box where you type in a keyword or words. 2___________________________________. These documents are shown on the computer screen in a results listing.
3__________________________________. If the keyword is too general, or includes too many different meanings, the results listing may not be useful. 4__________________________________.

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Computers are thought to have many remarkable powers. 1_________________________________. First, computers have circuits for performing arithmetic operations, such as addition, subtraction, division, multiplication and exponentiation. 2___________________________________. After all, if we couldn’t feed information in and get results back, these machines wouldn't be of much use. However, certain computers for example minicomputers and microcomputers are used to control directly things such as robots, aircraft navigation systems, medical instruments, etc.
3_________________________________. Computer can solve a series of problems and make hundreds, even thousands, of logical decisions without becoming tired or bored. 4_________________________________. A computer can replace people in dull, routine tasks, but it has no originality; it works according to the instructions given to it. A computer cannot do anything unless a person tells it what to do and gives it the appropriate information.

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One of the most important characteristics of a computer is its capability of storing information in its memory long enough to process it. 1__________________________________.
The memory of the first computers was made up of a kind of grid of fine vertical and horizontal wires. At each intersection where the wires crossed there was a small ferrite ring called a core and therefore we use the name “core memory”. 2__________________________________. There is one problem, however, with semiconductor memory: when power is removed, information in the memory is lost, unlike core memory which is capable of retaining information during a power failure.
3__________________________________. A magnetic bubble memory can store information at a greater density than existing memories, which makes it very suitable. 4__________________________________.

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A computer system is a collection of components that work together to process data. The purpose of a computer system is to make it as easy as possible for you to use a computer to solve problems. 1___________________________________. The hardware elements are the mechanical devices in the system, the machinery and the electronics that perform physical functions. 2___________________________________. Documentation includes the manuals and listings that tell you how to use the hardware and software.
3__________________________________. Usually, a computer system requires three basic hardware items: the computer, which performs all data processing; a terminal device, used like a typewriter for two-way communication between the user and the system; and a storage medium for storing programs and data. 4__________________________________.