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Despite the progress, there is still a long way to go, said Yang Shoude, a forest police officer in the Qinghai Lake National Nature Reserve. "If the naked carp population can not be increased in time, algae growth will become out of control and eventually 'kill' the lake," Yang said.

Ding said the current conditions of the real estate industry were closely related to the epidemic, and would depend on whether it could be effectively controlled.

Documents containing text messages between US and Ukrainian officials submitted to Congress Thursday by former US special envoy to Ukraine, Kurt Volker, showed that Sondland was involved in coordinating Washington's engagement with Zelensky's government before and after the presidential phone call. Zelensky, a former comedian, assumed office on May 20.

Dogs can still be used to sweep large areas deemed "low threat", he said, noting that procedures are currently being revised and new standards will be introduced in about a year.

Doing Business 2020 is the 17th in a series of annual studies investigating the regulations that enhance business activity and those that constrain it.