单项选择题

Which statement is NOT true about VOIP

A．It is the cheapest way of world-wide communication.
B．It is a good way to build strong relations.
C．It has the same quality as the traditional telephone service.
D．It uses a single network to transfer voice and dat

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单项选择题

What does VOIP refer to

A．An Internet forum.
B．A technology of telephone service.
C．Communication via e-mail.
D．An Internet conferenc

单项选择题

Which of the following is NOT mentioned as a cause for the slow growth of job opportunities

A．Mergers and challenges in the airline industry.
B．Advancement in technology.
C．Advanced business communication means.
D．Terrorists' attacks.