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
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.
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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