What kind of television is intended for small numbers of people（）

单项选择题Which of the following is NOT mentioned in the passage as a function of electronics in television transmission（）

A．The sending of impulses through a wire.
B．The transmission of voice from one TV set to another.
C．The conversion of an image into electronic impulses.
D．The feeding of impulses into the receiver.

单项选择题What is the topic of the passage（）

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