A policeman teaches an elementary student combat skills at a border-check base in Rizhao, East China's Shandong province, May 26, 2010. Some 30 students visited the base ahead of the upcoming Children's Day that falls on June 1. [Photo/Xinhua] 

Chinese elementary students try to fold quilts according to the requirements of police at a border-check base in Rizhao, East China's Shandong province, May 26, 2010. [Photo/Xinhua]