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Coal-to-gas switching was the main reason for the substantial improvement in Beijing's air quality during the last five years, he said.

Commenting on the report delivered by Xi at the opening session of the 19th CPC National Congress, Bar said he was especially interested in the part about following the path of peaceful development and working to build a community with a shared future for mankind.

Communist Party USA sent its first official delegation in a decade to China to the symposium, although academic exchanges have been undertaken regularly.

Commercial factories that currently produce such drugs will be required to cease. With the ban, the drugs－which have no medical value－will be illegal to make or possess.

Commercial cars, including buses and trucks, also reported a decent sales performance. In March, 488,000 vehicles were sold, a 5.8 percent rise from the same month last year. That brought sales in the first quarter to 1.08 million units, up nearly 4.1 percent year-on-year. Of these, bus sales were 97,000 units, up 2 percent from the same period last year and truck sales stood at 985,000 units, a 4.3 percent growth year-on-year.