1.The new teaching standard has regulated that mathematic history is an optional subject in the middle school.
新课标中已明确规定数学史作为选修内容进入中学课程。
2.I read many academic books about my major subject and optional subject outside class.
课外，我读许多专业和辅修的书籍。
3.Nowadays , English is a compulsory subject in china , and Chinese is an optional subject , I think this is a problem !
现今在中国，英语成了一门必修科目，汉语却成了一门选修科目，我想这是一个问题！
4.a multitude of students do not take completely the whole of courses whatever required subject or optional subject
许多学生无论是必修还是选修课也不会完整的修完所有课程。
5.Reflections on the Reform of Teaching Methods on Basketball Learning as an Optional Subject in Colleges and Universities
对我院篮球选修课教学改革的思考
6.Introduction to setting up "PE special item optional subject" in Gaoyou Middle School
高邮中学开设“体育专项选修课”介绍