A girl performs the antiphonal singing during the Eleventh Chinese Pu'er Tea Festival in Pu'er City, southwest China's Yunnan Province, April 27, 2011. The open ceremony of Eleventh Chinese Pu'er Tea Festival was held Wednesday in Pu'er with more than 300 troupers performing varied and colorful ethnic dances and songs for the visitors. [Xinhua/Yang Zongyou]