单项选择题

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

A．In a curve.
B．In all directions.
C．In a straight line.
D．Toward the horizon.
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单项选择题
From the first paragraph we know that ______.
A．most people use cable television
B．"community antenna" is another name for "regular antenna"
C．a community antenna is used for cable television
D．regular antennas cannot pick up TV signals programs
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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