单项选择题

The (72) is a system for linking hypertext documents Originally, each document was a page written in (73) with hyperlinks to other documents．Nowadays，XML is gradually starting to take over from (73) ．

A．Web
B．E-mail
C．DNS
D．FTP
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单项选择题
A．安全设置B．程序C．隐私设置D．内容
A．安全设置
B．程序
C．隐私设置
D．内容
单项选择题
A．191.168.1.33～191.168.1.47B．191.168.1.1～191.168.1.255C．191.168.1.33～191.168.1.46D．191.168.1.33～191.168.1.254
A．191.168.1.33～191.168.1.47
B．191.168.1.1～191.168.1.255
C．191.168.1.33～191.168.1.46
D．191.168.1.33～191.168.1.254
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