Which of the following is the main point of the text?

A．价值形式划分的

B．交换形式划分的

C．补偿形式划分的

D．实物形式划分的

［A］ record player

［B］ radio

［C］ musical technique

［D］ music culture

A．生产关系一定要适合生产力性质的规律

B．价值规律

C．按比例分配社会劳动的规律

D．货币流通规律

［A］ the importance of cultural tools and technology

［B］ the cultural influence of the development of civilization

［C］ the focus of the study of the material culture of music

［D］ the significance of the research into the musical instruments