Elective courses in universities are divided into professional courses and public courses. Public elective courses are free of charge in the whole school, usually starting at the end of a semester or the first week of school. General education courses are non-professional courses, such as general education in Zhejiang Normal University 1 and general education 2. General education 1 is a compulsory course for all students, such as Chinese, mathematics and English. General education 2 is an elective course for all students, including liberal arts and science. Liberal arts can choose science, and science can choose liberal arts.