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today the internet has become a world-wide network of networks. it in- terconnects millions of computers that differ in size, from comparatively simple to complex and huge mainframes and supercomputers. the internet is being used by people for many different purposes. among them- to find and retrieve important documents, to carry on long distance conversations and relationship with other users, to connect to supercomput- 26lmo ers and numerous other activities. the internet is made up of many types of computers and uses a great va- riety of different operating systems. these different operating systems and computers can exchange data by connecting computer networks with a stan- dard set of communication procedures. o or tociihogje' clkocip o et 9. pair work. put the questions (exercise 7) to your group-mate and ask him/her to answer them.

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