题目内容

I am sure ________ he said is true.

A. that
B. about that
C. of that
D. that what

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Television sound signal is generated by a ______________.

A. TV camera
B. microphone
C. TV receiver
D. FM detector

Television is a kind of __________.

A. transmitter
B. receiver
C. transceiver
D. impulse

The three primary colour of TV are ___________.

A. red,blue and yellow
B. red,green and white
C. red,greenand blue
D. yellow, magenta and cyan

After being amplified,________is fed to the loud speaker.

A. modulated frequency signal
B. demodulator
C. audio
D. FM detector