Senior one is not an elective course, but an auxiliary course, such as physical education class and experiment.
Extended data:
China's ordinary senior high school education system is constantly improving and reforming. From the initial unification of all parts of the country to the emergence of liberal arts and sciences, some provinces and cities have been given the right to independently carry out high school curriculum reform.
In addition, the government of China gave high-quality textbooks to competent publishers, which broke the situation that textbooks were taught by others in the past. Later, the emergence of elective courses made high schools show new vitality.
References:
Baidu encyclopedia-high school