Which of the following is probably the time the Chinese people to have a family get-together

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

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