[解析]
(1)A.细节理解题。根据第二段Many people are surprised when they find that the Internet was set up (建立) in the 1960s.许多人在发现互联网是在20世纪60年代建立的时候都感到惊讶。可知,互联网已经被使用了超过60年,故选A。
(2)A.推理判断题。根据第三段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.起初,只有政府使用互联网,但在20世纪70年代初,大学、医院和银行也被允许使用互联网。可知,起初,互联网只被政府使用。故选A。
(3)C.细节理解题。根据第三段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.到20世纪90年代初,电脑已经变得更便宜、更容易使用。科学家们还开发了一种软件,使 "网上冲浪"更方便。可知,软件使上网更方便。故选C。
(4)C.推理判断题。根据倒数第二段Sending e﹣mails is more and more popular among students.发送电子邮件在学生中越来越流行。可知,发送邮件在学生中变的流行,故选C。