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BEIJING, July 18 (Xinhua) -- The Qinghai-Tibet Plateau, which covers over one-fourth of China's land area, is still one of the cleanest regions on earth, said a white paper issued by the Chinese government Wednesday.

Another special item on display is a black vinyl disc that recorded an album entitled Cheel Lai (Arise!), in which famous black singer Paul Robeson sang a song at a 1941 open-space concert in New York. The song was later adapted as the national anthem of the People's Republic of China founded in 1949.

Private employment was a sensitive issue when China began to shift from a planned economy to a market one. The Jinjiang government gave the green light to private financing to start enterprises, employ workers, distribute dividends, and to market-based pricing, making Jinjiang a pioneer of China's rural industrialization.

He viewed three autopilot test vehicles produced by six enterprises and technological institutes from China and Germany.

So far, AMS has gathered more than 120 billion cosmic particles, with energy reaching a trillion electron volt, Ting said at the press conference.