若某学校要从5名男教师和3名女教师中选出3人作为上海世博会的首批参观学习者，则选出的参观学习者中男女教师均不少于1名共有____选法．

Red Star Restaurant
The biggest and busiest restaurant in Jinan is seeking 20 waiters who have relevant (相关的) experiences in high-grade restaurants. About ¥800—1,500 per month.
Red Star Restaurant is located at 66 on Park Street.
Our phone number is 0531-8278-4560.
3 People wanted
Need 3 people who would like to work 4 evenings per week showing films. Earn $300 per week possibly. Call 469-867-6042.
Baby-sitter wanted
For a year. 3 days a week. Some flexible (灵活的) hours required.
Knowledge: above senior middle school.
Call 0431-478-9971.

听独白，根据所听内容选择最佳答案。

下列事实不属于社会行为的是

长江的主要支流中，位于干流南面的是（    ）