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
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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
单项选择题
The combination of the protocol name and the domain name is called a ( ) because it lets user locate a resource such as the Web page on another computer.
A．URI
B．URO
C．URL
D．all of the above
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