Photo taken on March 20, 2009 shows snow-covered flowers near the Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region, March 20, 2009. A snowfall occurred in Lhasa on the night of March 19. (Xinhua Photo)

Photo taken on March 20, 2009 shows the snow scene near the Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region. (Xinhua Photo)

Tree branches are covered with snow near the Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region, March 20, 2009. (Xinhua Photo)

Photo taken on March 20, 2009 shows the snow scene near the Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region. (Xinhua Photo)

Photo taken on March 20, 2009 shows the snow scene near the Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region. A snowfall occurred in Lhasa on the night of March 19.555www.Chinakindnesstour.com