下列句中加点的词语，意义相同的一组是  (    )

A．①大喜，笼归，举家庆贺

②举天下之豪杰，莫能与之争

B．①举所佩玉块以示之者三

②吾不能举全吴之地，十万之众，受制于人

C．①举类迩而见义远

②今亡亦死，举大计亦死

D．①杀人如不能举②戍卒叫，函谷举

Many people are surprised when they find the Internet(因特网)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 (系统) had to be set up. It should be good enough to be used by many different computers. If a part of the network was not working, information could be sent 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 early 1970s,universities(大学) ,hospitals and banks were allowed(允许) to use it too. However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990s, computers became cheaper and easier to use.
Today it is easy to get on-line(上网) and it is said that millions of people use the Internet every day. Sending e-mail is more and more popular among students.
The Internet has now become one of the most important parts of people’s life.

Computers become cheaper and easier to use in the ______.

A. 1960s


B. 1970s

C. 1990s