President of Rice University David Leebron delivers a speech at the opening ceremony of an art exhibition event in Houston, Texas, the United States, Jan. 5, 2019. An art exhibition commemorating the 40th anniversary of the establishment of diplomatic relations between China and the United States kicked off Saturday in Houston. The six-day exhibition displays precious photos showing the historical stages and important achievements of Sino-U.S. relations over the past 40 years. The exhibition was also held to celebrate the 120th anniversary of famous Chinese artist Zhang Daqian's birth. Dozens of replicas of Zhang's works, as well as art pieces by American and Chinese artists, are exhibited. (Xinhua/Liu Liwei)