Police officers at the Changchun Entry-Exit Border Checkpoint in Changchun – the capital city of Northeast China's Jilin province – read books on the history of the Communist Party of China (CPC), marking World Book and Copyright Day on April 23. This year marks the 100th anniversary of the founding of the CPC. A series of themed activities will be launched in the province in celebration of the event. [Photo provided to chinadaily.com.cn]