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BEIJING, April 23 (Xinhua) -- Senior Chinese lawmakers on Wednesday expressed concerns over the country's low energy efficiency and high emissions, as a recent report suggested that China is lagging behind its energy conservation and emission reduction targets.

LUANDA, May 8 (Xinhua) -- Chinese Premier Li Keqiang's visit to Angola will further deepen economic and trade cooperation between the two countries, said Chinese Commerce Minister Gao Hucheng here on Thursday.

Li arrived in Luanda Thursday afternoon for an official visit to the southern African country, the third leg of his ongoing four-nation Africa tour, which has taken him to Ethiopia and Nigeria and will conclude in Kenya.

The local government is investigating the source of the contamination, and sources with Veolia told Xinhua that they believe the benzene came from chemical waste, but refused to single out any particular plant.

A report issued in April showed that nearly 60 percent of monitored areas in China had "very poor" or "relatively poor" underground water quality last year. Another report issued jointly by the Ministry of Environmental Protection and the Ministry of Land and Resources on April 17 showed that about 16.1 percent of the country's soil is polluted.