Representatives of ethnic groups cheer at the flag-raising ceremony to mark the National Pavilion Day for China at the Shipway Square of Puxi section of the World Expo Park in Shanghai, east China, Oct. 1, 2010, during the 61st anniversary of the founding of the People's Republic of China. [Xinhua/Yang Guang]     Representatives of volunteers cheer at the flag-raising ceremony to mark the National Pavilion Day for China at the Shipway Square of Puxi section of the World Expo Park in Shanghai, east China, Oct. 1, 2010, during the 61st anniversary of the founding of the People's Republic of China. [Xinhua/Yang Guang]