Residents queue to buy qingtuan in Shanghai(1/4)

Local residents queue to buy qingtuan at a shop in Shanghai, April 1, 2020. Days before the Chinese Qingming Festival, which falls on Saturday, many people in Shanghai waited in line for hours to have a bite of a century-old snack. Qingtuan, a sweet green rice ball, is a must-have offering for the ancestral rituals of Qingming Festival in the Yangtze River region. (Photo: China News Aervice/ Tang Yanjun)

A chef makes qingtuan at a shop in Shanghai, April 1, 2020. Days before the Chinese Qingming Festival, which falls on Saturday, many people in Shanghai waited in line for hours to have a bite of a century-old snack. Qingtuan, a sweet green rice ball, is a must-have offering for the ancestral rituals of Qingming Festival in the Yangtze River region. (Photo: China News Aervice/ Tang Yanjun)

Local residents queue to buy qingtuan at a shop in Shanghai, April 1, 2020. Days before the Chinese Qingming Festival, which falls on Saturday, many people in Shanghai waited in line for hours to have a bite of a century-old snack. Qingtuan, a sweet green rice ball, is a must-have offering for the ancestral rituals of Qingming Festival in the Yangtze River region. (Photo: China News Aervice/ Tang Yanjun)

A worker arranges qingtuan at a shop in Shanghai, April 1, 2020. Days before the Chinese Qingming Festival, which falls on Saturday, many people in Shanghai waited in line for hours to have a bite of a century-old snack. Qingtuan, a sweet green rice ball, is a must-have offering for the ancestral rituals of Qingming Festival in the Yangtze River region. (Photo: China News Aervice/ Tang Yanjun)