Chinese basketball player Yao Ming, the official face of the 2010 Shanghai 
World Expo, gives a speech during an event to promote environmental protection for the 2010 Shanghai World Expo in Shanghai, February 10, 2010. (Xinhua/Fan Jun)

Chinese basketball player Yao Ming, the official face of 
the 2010 Shanghai World Expo, gives a speech during an event
 to promote environmental protection for the 2010 Shanghai 
World Expo in Shanghai, February 10, 2010. (Xinhua/Fan Jun)

China's 110m hurdle athlete Liu Xiang signs in an event to promote environmental protection for the 2010 Shanghai World Expo in Shanghai, February 10, 2010. (Xinhua/Fan Jun)

China's 110m hurdle athlete Liu Xiang (L) poses for a photo
 with a boy during an event to promote environmental protection
 for the 2010 Shanghai World Expo in Shanghai, February 
10, 2010. (Xinhua/Fan Jun)

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