单项选择题

The high-speed data services for the interconnection of computer networks are usually referred to as ______ connections．

A．LANs
B．MANs
C．WANs
D．ATM
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单项选择题
E-mail is a(n) ______ message delivery system that allows information such as typed messages and multimedia to be sent to individual compmer users．
A．graphic-based
B．char-based
C．web-based
D．text-based
单项选择题
电子邮件中的两个协议中，（）协议是接收邮件的协议。

A．SMTP
B．SNMP
C．POP3
D．MIME
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