[单项选择]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.
A. less than 30
B. about 40
C. about 20

最新试题

• ●    [简答题]支队机关按照编制序列以及支队队形性质，编成纵队或者横队，位于第一个大队前或者左侧
• ●    [单选题]进出车厂时,列车在出入厂线因故停车时,应立即汇报行调及通知( )。
• ●    下面是国际货币基金组织领导人关于希腊债务危机前景及举措答记者问。 　　 There are a
• ●    [判断题]银行汇票丧失，失票人可以凭人民法院出具的其享有票据权利的证明，向代理付款银行请求付款或退款
• ●    某企业业务员未持有该企业出具的任何证明签订合同，该企业未予盖章即开始履行。如果发生合同纠纷，( )
• ●    痰火扰心型心悸，最佳治疗选方为（）