We are all busy talking about and using the Internet , but how many of us know the history of the Internet ? Many people are surprised when they find that Internet was set up in the 1960s.At that time , computers were large and expensive, Computer networks (网络) didn't work well.If one computer in the network broke down,then the whole network stopped.So a new network system had to be setup , it should be good enough to be used by many different computers .If part of the network was not working , information could be send through another part.In this way , computer network system would keep on working all the time.At first , the Internet was only used by the government , but in the early1970S Universities, hospitals and banks were allowed to use it too , however , computers were still very expensive and Internet was difficult to use.By the of the the1990s ,computers became cheaper and easier to use.Scientists have also developed software that made “ surfing ” the Internet more convenient (方便)。 Today , it's easy to get on-line , and it's said that millions of people use the Internet every day.The internet has now become one of the most important parts of people's life. 90.Which of the following is true?