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. C) In all directions. B) In a straight line. D) Toward the horizon.

A．Of the following, which is NOT the way TV signals travel
B．In a curve.
C．In a straight line.
D．In all directions.
E．Toward the horizon.

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