单项选择题

Of the following, which is NOT the way TV signals travel

A．In a curve.
B．In a straight line.
C．In all directions.
D．Toward the horizon.
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单项选择题
Cable TV is becoming more and more popular because ______.
A．it is free of charge
B．it can provide more programs
C．it provides all TV users good pictures
D．TV sets with regular antennas can also have a good reception through CATV
单项选择题
On the whole, this passage is about ______.
A．how to put up high antennas
B．a way of picking up better TV programs
C．how to use the empty channels on your TV set
D．the way that TV signals are sent
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