Children of Mongolian ethnic group in traditional costumes play with a sled in Xi Ujimqin Qi, north China's Inner Mongolia Autonomous Region, on Dec. 28, 2009. The ice and snow carnival is opened in Ujimqin grassland on Monday. Many activities, including horse-racing, archery, picking things on a running horse and camel-racing, will be held to attract tourists here and promote the unique custom of Mongolian ethnic group. [Photo/Xinhua] 

Girls of Mongolian ethnic group play in front of a Monglian yurt in Xi Ujimqin Qi, north China's Inner Mongolia Autonomous Region, on Dec. 28, 2009. [Photo/Xinhua]