单项选择题

With what topic is the passage primarily concerned

A．Recent changes in modem technology.
B．The marriages of broadcasting giants.
C．The role of television in today' s society.
D．The content of broadcast television programs.

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单项选择题

What is the literal meaning of the word television

A．Medium of the States.
B．Sight from a distance.
C．Airwave transmission.
D．Vehicle for communication.

单项选择题

Which of the following is NOT mentioned in the passage as a function of electronics in television transmissions

A．The conversion of an image into electronic impulses,
B．The sending of impulses through a wire cable.
C．The changing of one image into another image.
D．The feeding of impulses into a receiver.