A unit in sex education was about to begin, and each student had to bring in a permission slip in order to take it. A boy handed in his slip and explained to the teacher, "My mom says I can take the course as long as there's no homework."

　　学校即将开始性教育课程，每个学生都要先回去证得父母的同意，方能学习此课程。一个小男孩把他父母的同意纸条交给老师说：“我妈妈说了，只要这个课没有家庭作业，我就可以上。”