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COVID-19 symptoms can appear as early as two days after infection or as late as 14 days, according to the CDC.
CNN reported that a source "familiar with the president's thinking" said Trump has shifted to encouraging mask wearing primarily because of polls showing Democratic presidential candidate Joe Biden leading him by wide margins in some key states.
Cal Jillson, a political scientist and historian at Southern Methodist University in Dallas, told China Daily that Trump has long been dissatisfied with the inability of Homeland Security led by Nielsen to stem the flow of refugees and asylum seekers across the US border with Mexico.
CHICAGO - Former US President Barack Obama returned to Chicago on Wednesday to unveiled a 3-D model of his presidential center which includes three buildings.
CSRC plans more steps to attract listings from innovative firms
来源：资阳报