HAIKOU, May 1, (Xinhua) -- Rescuers participate in a drill in Haikou, south Chinas Hainan Province, April 30, 2019. A comprehensive drill on typhoon was held in Haikou to test the response ability to the emergency.

HAIKOU, May 1, (Xinhua) -- A helicopter participates in a drill in Haikou, south Chinas Hainan Province, April 30, 2019. A comprehensive drill on typhoon was held in Haikou to test the response ability to the emergency.

NANCHANG, May 1, (Xinhua) -- Performers perform dragon dance during a tourism fair opened ahead of the May Day holiday in Nanchang, east Chinas Jiangxi Province, April 30, 2019.

GUIYANG, May 1, 2019 (Xinhua) -- Aerial photo taken on May 1, 2019 shows Guanshanhu district shrouded in fog in Guiyang, southwest Chinas Guizhou Province.