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
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B．It will be out of date soon.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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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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