C.Because few people knew how to use computers.
D.Because computers at that time were too large.
解析 细节理解题。根据第二段的第三句“Up to 100 people would be logged in and share the computer because these computers were very expensive.”可知,一百多个人使用一台电脑是因为电脑太贵,很少有人买得起。
答案 B
3.From the passage we can see that “Google Talk”______.
A.is a kind of search engine
B.refers to a computer company
C.is a famous website
D.is an IM program
解析 细节理解题。根据第三段内容可知,要想进行即时聊天,你需要在电脑上装一个IM程序,并且有很多这样的程序供你选择,故Google Talk是一个IM程序。
答案 D
4.The underlined“it” in the last paragraph most probably refers to“______ ”.
A.a server B.an IM
program
C.a computer D.the Internet
解析 代词指代题。根据上文中的“Your IM program is communicating with a computer,called a server”以及“All your friends' computers are communicating with a server,too.”可知,此处的it指的就是前面提到的a server。
答案 A
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