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Beijing will work with the United States to ensure US President Donald Trump's first state visit to China is successful, visiting Vice-Premier Liu Yandong said in Washington on Wednesday.

Beijing reported no new confirmed coronavirus cases on Friday, marking the fourth time in a week that the capital announced no newly infected patients from the previous day.

Beijing will host the 2019 China International Fair for Trade in Services from May 28 to June 1. Launched in 2012 for the first time, the event is aimed at promoting the healthy growth of the sector, showcasing the host city and the country's emphasis on services trade.

Beijing, Guangzhou, Shenzhen and Hangzhou have enacted or revised regulations on garbage classification to enhance the guidance of people's actions, strengthen classification in the whole process and supervise law enforcement.

Beijing issued a blue alert for potential geological disaster early Tuesday as thunderstorms are expected to lash the city, and at least 127 scenic spots in the capital were temporarily closed on Monday.