(190422) -- BOZHOU, April 22, 2019 (Xinhua) -- Students read poems in a flash mob activity in the library of Bozhou Vocational and Technical College in Bozhou City, east China's Anhui Province, April 21, 2019. Various activities have been held across China for the upcoming World Book Day, which is celebrated yearly on April 23 to promote reading, publishing and copyright. (Xinhua/Zhang Yanlin)