Tess Johnson (C) of the United States starts during the ladies' Moguls on the Day 1of the 2017-2018 Freestyle Skiing World Cup-Moguls & Aerials at the Thaiwoo ski resort in Chongli District of Zhangjiakou City, north China's Hebei Province, Dec. 21, 2017. (Xinhua/Meng Jing)