We are all busy talking about using the Internet, but how many of us know the history of t

We are all busy talking about using the Internet, but how many of us know the history of the Internet?
Many people are     36     when they find that the Internet was set up in the 1960s. At that time, puters     37     large and expensive. Computer networks didn’t work well. If one puter in the network     38     down, the whole network stopped.     39     a new network system（系统）had to be set up. It should be     40     to be used by many different puters. If part of the network was not working,     41     could be sent through another part. In this way puter network system would keep on     42     all the time.
At first the Internet was only used by the government, but in the early 1970s, universities, hospitals and banks were allowed to use it too. However, puters were still very expensive and the Internet was difficult to use. By the start of the 1990s, puters became cheaper and     43     to use. Scientists had also developed software that made “surfing”（浏览）the Internet more convenient.
Today it is easy to get on-line and it is said that millions of people use the Internet every day.     44     e-mail is more and more popular among students. The Internet has now bee one of     45     parts of people’s life.
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