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This photo released by Xinhua News Agency shows an aerial view of residents lining up to receive a swab for the coronavirus test during a mass testing in Lanzhou, capital city of northwest China's Gansu Province, Sunday, Oct. 24, 2021. China's Gansu has closed all tourist sites following the reporting of new COVID-19 cases in the northwestern province. Gansu lies along the ancient Silk Road and is famed for the Dunhuang grottoes filled with Buddhist images and other ancient religious sites. (Fan Peishen/Xinhua via AP)