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
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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
单项选择题
specifies the format of a mail message and describes how mail is to be administered on the E-mail server and transmitted on the Internet.
A．FTP
B．SMTP
C．POP
D．IMAP
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