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During primary school, Lang was among the top five students in Chinese, math and English in his grade, which has 320 students, Xie said.

During an interview with CNN's Fareed Zakaria GPS on Sunday, Daszak also clarified that most pandemics originate in animals, usually wildlife, often bats.

During his presidency, Trump has maintained a hardline stance on immigration and border security, and pushed for a series of controversial measures, including erecting a border wall along the nation's southern border with Mexico, in a bid to deter illegal immigrants.

During the past month, the composite material, a mixture of black titania and three-dimensional (3D) tubular graphene, was used to clean a 40,000-square-meter area of water in east China's Shanghai, Anhui, and Jiangsu as part of a pilot scheme.

During the excavation, archaeologists also unearthed a large number of cultural relics from the Liao and Jin dynasties, including precious stone Buddha statues, architectural components, iron knives and porcelain.