单项选择题

In this passage, "optical" can be understood as related to.

A．light
B．audio
C．electronics
D．multimedia
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单项选择题
According to the passage, ______ has become the driving force for the development of telephone system
A．information technologies
B．Internet
C．PC
D．convergence of telecommunications technologies
单项选择题
What can be concluded about modem
A．It converts data from one form to another.
B．It will be out of date soon.
C．It serves as a link between senders and recipients of message.
D．It transmits message more efficiently than other devices.
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