2016-2017学年 人教版 选修6 unit3 A healthy life using language 课件 (9)
2016-2017学年 人教版 选修6 unit3 A healthy life using language 课件 (9)第3页

 Aids is the 4th leading cause of death worldwide, and No.1 cause of death due to infectious disease. It has become the worst medical disaster ever experienced by human kind. Half of new HIV infections happen to young people aged from 15 to 29.