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