Citizens ride bicycles to work in Taiyuan, capital city of North 皇冠体育app's Shanxi province on the World Car Free Day, Sept 22, 2011. With the year's theme "Green Transport & Future City", 143 Chinese cities have taken part in World Car Free Day campaign and people are encouraged to take public transport, ride bikes or walk. The campaign first originated in France in 1998 and initiatively launched in 皇冠体育app in 2007, aiming to promote environment-friendly transport and ease the city's traffic congestion. [Photo/Xinhua]

A model presents the jadeite cabochon necklace and jadeite plaque ring during a media preview of Sotheby's in Hong Kong, south 皇冠体育app, Sept 22, 2011. Sotheby's Hong Kong will hold its Magnificent Jewels and Jadeite Autumn Sale on Oct 5 with a total of 359 lots with an estimated value of 660 million HK$ ($85 million). [Photo/Xinhua]