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Prior to his visit to the U.S., Xi paid state visits to Trinidad and Tobago, Costa Rica and Mexico. In March, Xi chose Russia, Tanzania, South Africa and the Republic of Congo as destinations of his first foreign trip since he became president, in the same month.

BEIJING, May 3 (Xinhua) -- China is working to unify different sets of bottled water quality standards, said a major food safety agency on Friday, in the wake of a public outcry for supervision of the industry.

West areas of Gansu Province and some parts of the neighboring Ningxia Hui Autonomous Region and Shaanxi Province will be hit by sandstorm from Sunday to Monday, the center added.

Ban also wished Xi success in his forthcoming visit to Russia and the three African nations of Tanzania, Congo and South Africa. He also expressed the hope that the BRICS summit in South Africa would produce positive results. The United Nations is willing to strengthen cooperation with China in African affairs, he said.

The overhaul will target key sectors, such as the coal mining and hazardous chemical industries, as well as labor-intensive enterprises, according to the statement.