关于选修课的英语作文 急需！

And "compulsory" relative. Mainly refers to institutions of higher learning and secondary specialized schools to learn a profession can have the students choose to study courses. Teaching programs in general do not make hard and fast rules. Elective courses at the restrictive (some elective courses in a particular professional designation, the profession may be regarded as a required course) and non-restrictive elective courses (any professional elective courses) in two