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Tree branches are weighed down by heavy snow in Lanzhou, Gansu Province on Monday, April 21, 2008. The temperature throughout the province dropped to nearly zero degrees Celsius in the wake of cold air from Siberia. [Photo: Xinhuanet]

A passer-by walks in the snow in Lanzhou, capital of northwestern China's Gansu Province, on Monday, April 21, 2008. [Photo: Xinhuanet]

Pedestrians hurry through the streets of Lanzhou, Gansu Province on Monday, April 21, 2008. The temperature dropped as much as 10 degrees in some regions in the province, adversely affecting agricultural output. [Photo: Xinhuanet]

A local resident enjoys the snow in a garden in Xining, on the eastern part of the Qinghai-Tibet Plateau, on Monday, April 21, 2008. The temperature there dropped suddenly in the wake of strong, cold air gusts. [Photo: Xinhuanet]

A citizen sweeps thick snow off a car in Guyuan, Ningxia Hui Autonomous Region on Monday, April 21, 2008. [Photo: Xinhuanet]

(CRI April 22, 2008)