单项选择题

Which of the aspects of telecommunication is NOT mentioned in the passage

A．Current development.
B．Transmission of message.
C．Computer networking.
D．Government regulation.
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单项选择题
Television is a ______ in the transmission of message.
A．sender
B．receiver
C．transmitting device
D．none of the above
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B．It will be out of date soon.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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