A、 They travel faster near the TV station.
B、 They can work better than ever before.
C、 They usually follow the curve of the earth.
D、 They travel in straight lines in all directions.

【正确答案】 D

【答案解析】解析：短文提到，电视信号不沿地球的曲线传播，而沿直线向四周传播，故D正确。

A、 Pay a monthly charge.
B、 Pay a yearly charge.
C、 Pay a daily charge.
D、 Pay an hourly charge.

【正确答案】 A

【答案解析】解析：短文提到，有线电视用户要每月交费，故A正确。

A、 All classrooms use cable television.
B、 City people can see extra programs.
C、 The charge of cable is much lowered.
D、 TV signals can be received more easily.

【正确答案】 B

【答案解析】解析：短文提到，有线电视进入城市后，给城市观众带来了普通天线无法提供的额外节目，故B正确。