Chinese paramilitary police wearing goggles and face masks march in formation at the Yanqing National Sliding Center during an IBSF sanctioned race, a test event for the 2022 Winter Olympics, in Beijing, Monday, Oct. 25, 2021. A northwestern Chinese province heavily dependent on tourism closed all tourist sites Monday after finding new COVID-19 cases. The spread of the delta variant by travellers and tour groups is of particular concern ahead of the Winter Olympics in Beijing in February. Overseas spectators already are banned, and participants will have to stay in a bubble separating them from people outside. (AP Photo/Mark Schiefelbein)

Maxim Andrianov, Aleksei Pushkarev, Vasiliy Kondratenko, and Vladislav Zharovtsev of Russia compete in the four-man bobsleigh during an IBSF Sanctioned Race, a test event for the 2022 Winter Olympics, at the Yanqing National Sliding Center in Beijing, Tuesday, Oct. 26, 2021. (AP Photo/Mark Schiefelbein)