问题补充：
We are all busy talking about and using the Internet (互联网), but how many of us know the h【小题1】 of the Internet?
Many people are surprised when they find that the I【小题2】_ was set up in the 1960s. At that time, computers were large and e【小题3】 . Computer networks (网络) didn work well. If one computer in the network broke down, then the whole network stopped. So a new network system had to be set up. It should be good e【小题4】 to be used by many different computers. If part of the network was not working, information could be sent through a【小题5】_ part. In this way computer network system would keep on w【小题6】 all the time.
At f_【小题7】_ the Internet was only used by the government, but, in the early 1970s, universities, hospitals and banks were allowed to use it too. H【小题8】, computers were still very expensive and the Internet was d【小题9】 to use. By the start of the 1990s, c【小题10】_ became cheaper and easier to use. Scientists had also developed software that made surfing (浏览) the Internet more convenient.
Today it is easy to get on-line (上网) and it is said that m【小题11】 of people use the Internet everyday. Sending e-mail is more and more p【小题12】 among students.
The Internet has now become one of the most important parts of peoples life.History
答案：
(答案→)History
解析：
【小题1】此题考查名词，根据语境可知很多人都不了解互联网的历史故填history。
【小题2】此题考查名词，根据语境可知互联网在20世纪60年代建立的，故填Internet。
【小题3】此题考查形容词，根据语境可知在那个时候电脑又大又贵，故填expensive。
【小题4】此题考查副词，根据语境可知互联网必须足够好才能使每台电脑正常工作，故填enough。
【小题5】此题考查不定代词，another表示另一部分。
【小题6】此题考查固定短语keep on doing sth表示一直做某事，故填working，意思是网络系统必须一直工作。
【小题7】此题考查固定短语at first表示起初，开始。起初电脑只是政府部门使用。
【小题8】此题考查连词，表示转折，故用however。
【小题9】此题考查形容词，根据语境可知当时的网络很难利用，故填difficult。
【小题10】此题考查名词，根据语境可知到了20世纪90年代电脑变小了，故填computer。
【小题11】此题考查形容词，表示很多人在利用网络，故用millions或most
【小题12】此题考查形容词，利用网络发电子邮件越来越流行，故填popular。
