People walk on a snow-covered road in Mudanjiang, northeast China's Heilongjiang Province, Nov. 7, 2010. A cold front was sweeping the northern parts of China, causing snowfall or sleet and making the temperature drop in the areas. (Xinhua/Zhang Chunxiang)

A citizen rides in the snow in Mudanjiang, northeast China's Heilongjiang Province, Nov. 7, 2010. A cold front was sweeping the northern parts of China, causing snowfall or sleet and making the temperature drop in the areas. (Xinhua/Zhang Chunxiang)