单项选择题

The two primary protocols on which the Internet is based are( ).

A．FTP FInd TMAP
B．TCP and IP
C．TCP and SMTP
D．TCP and HTTP
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单项选择题
( )requires signing up with an ISP, which serves as a pipeline to the Internet.
A．Getting connected to the Internet
B．Visiting the Internet
C．On line
D．Down line
单项选择题
Electronic commerce refers to business activities conducted using electronic data transmission via( ).
A．the Internet and World Wide Web
B．telephone
C．magazine
D．newspaper
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