单项选择题

From the passage we can infer that ______.

A．TV has begun to be used for educational purposes
B．there is no charge for CATV
C．cable TV cannot be used in mountainous areas
D．antennas for cable TV are usually put up in the center of a community

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热门试题

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.

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