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Chinese Vice Premier Liu Yandong and Head of the Publicity Department of the Communist Party of China Central Committee Liu Qibao attend a celebration to mark the 40th anniversary of the founding of Chinese Academy of Social Sciences (CASS) in Beijing, capital of China, May 17, 2017. Chinese President Xi Jinping sent a letter of congratulations to CASS on the 40th anniversary of its founding. The letter was read by Liu Yandong at the celebration held by CASS Wednesday. (Xinhua/Yan Yan)
