1the internet has a history of ( )years.2scientist set up a

1the internet has a history of ( )years.2scientist set up a new network system to ( ).
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 the Internet was set up in the 1960s.At that time,computers were large and expensive.Computer networks didn't work well.If one computer in the network broke down,the whole network stopped.So a new network system had to be set up.It should be good enough to be used by many different computers.If part of the network was not working,information could be sent through another part.In this way computer network system could keep on working 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,computers were still very expensive and the Internet was difficult to use.By the start of the 1990s,computers had become cheaper and easier to use.Scientists had also developed software that made "surfing" 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.Sending e-mails is more and more popular among students.
The Internet has now become one of the most important parts of people's life
2提给了三个选项：A :make the computer cheaper
B:make the system work well
c:make the computer go well

第一段讲1960年有了网络但是不太好用,所以未普及,然后提出了改进方法
第二段1970年开始将“改进方法”普及,1990 PC价格下调,真正普及
1）1960~2012 自己减一下好了
2）B.主要讲网络的改进方法,而不是a,c选项的侧重点 （a 价格）（c 电脑自身）