The Internet is an open system，and most information is available to everyone．It is very important to add(74)to existing system for protecting the secret information．
A．Web pages
B．modem
C．security
D．network
The Internet is an open system，and most information is available to everyone．It is very important to add(74)to existing system for protecting the secret information．
A．Web pages
B．modem
C．security
D．network
C
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