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
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单项选择题
In this passage, optical can be understood as related to.
A．light
B．audio
C．electronics
D．multimedia
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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