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
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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