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Among the 500 firms, 431 reported R&D data. Their combined R&D spending totaled 1.08 trillion yuan, with the ratio of R&D expenditure to operating revenues rising to a historic high of 1.61 percent.

Amazon’s grocery delivery service is also seeing huge demand as more people order groceries online. The company said Sunday that it won’t accept new customers for its Amazon Fresh grocery delivery service and will place them on a waitlist. Amazon is reserving some shopping hours at its Whole Foods grocery stores so that online delivery orders can be fulfilled.

Amid a broad effort to discredit Special Counsel Robert Mueller and the FBI, Trump and his allies have accused law enforcement officials of spying on his campaign and called for an investigation into the origins of the Mueller probe, which started at the FBI in mid-2016.

Among the 21 service sectors surveyed, 15 saw expansion in their business activities in May.

Amid such videos' rising popularity, China's internet regulator has ramped up oversight of the platforms they appear on, after some were found to be sharing harmful and vulgar content.