单项选择题

A packet-switched network, files and E-mail messages are broken down into small pieces, called( ).

A．messages
B．pieces
C．packets
D．circuits
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单项选择题
The economic model that enables consumers to sell goods or services to each other is( ).
A．C2G
B．C2B
C．B2B
D．C2C
单项选择题
A person can visit a ( ) at any time or at any point in the discussion and enter the conversation by responding to a question or posting his or her own article.
A．FTP
B．E-mail
C．WWW
D．newsgroup
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