FILE - In this Feb. 27, 2018, file photo, Chinese performers dance during a ceremony to mark the arrival of the Olympic flag and start of the flag tour for the Winter Olympic Games Beijing 2022 at a section of the Great Wall of China on the outskirts of Beijing. Uncertainty surrounds how the postponed Tokyo Olympics will be held next year in the midst of the coronavirus. The same questions permeate three mega-events that will be staged in China within a year after the Tokyo Games close. (AP Photo/Ng Han Guan, File)

FILE - In this Dec. 14, 2019, file photo, New Zealand's Margaux Hackett jumps during the Women's Freeski Big Air in the finals of the 2019 FIS Big Air World Cup held at the Big Air Shougang, a venue newly built for the 2022 Beijing Winter Olympics in Beijing. Uncertainty surrounds how the postponed Tokyo Olympics will be held next year in the midst of the coronavirus. The same questions permeate three mega-events that will be staged in China within a year after the Tokyo Games close. (AP Photo/Ng Han Guan, File)

FILE - In this Sept. 17, 2019, file photo, Beijing 2022 Winter Olympic Mascot Bing Dwen Dwen, left on screen and 2022 Winter Paralympic Games mascot Shuey Rong Rong, right on screen are revealed during a ceremony held at the Shougang Ice Hockey Arena in Beijing. Uncertainty surrounds how the postponed Tokyo Olympics will be held next year in the midst of the coronavirus. The same questions permeate three mega-events that will be staged in China within a year after the Tokyo Games close. (AP Photo/Ng Han Guan, File)

FILE - In this Feb. 27, 2018, file photo, a child waves a Chinese national flag and an Olympic flag during a ceremony to mark the arrival of the Olympic flag and start of the flag tour for the Winter Olympic Games Beijing 2022 at a section of the Great Wall of China on the outskirts of Beijing. Uncertainty surrounds how the postponed Tokyo Olympics will be held next year in the midst of the coronavirus. The same questions permeate three mega-events that will be staged in China within a year after the Tokyo Games close. (AP Photo/Ng Han Guan, File)

FILE - In this Dec. 11, 2019, file photo, security personnel guard an entrance to the Big Air Shougang, a venue newly built for the 2022 Beijing Winter Olympics in Beijing. Uncertainty surrounds how the postponed Tokyo Olympics will be held next year in the midst of the coronavirus. The same questions permeate three mega-events that will be staged in China within a year after the Tokyo Games close. (AP Photo/Ng Han Guan, File)

FILE - In this Dec. 11, 2019, file photo, skiers practice on the Big Air Shougang, a venue newly built for the 2022 Beijing Winter Olympics in Beijing. Uncertainty surrounds how the postponed Tokyo Olympics will be held next year in the midst of the coronavirus. The same questions permeate three mega-events that will be staged in China within a year after the Tokyo Games close. (AP Photo/Ng Han Guan, File)