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In this photo released by Xinhua News Agency, residents line up to receive a swab for the coronavirus test during a mass testing in Xixia District of Yinchuan in northwest China's Ningxia Hui Autonomous Region Saturday, October 23, 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. (Photo by Feng Kaihua/Xinhua via AP Photo)
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