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Wang said the room for developing energy-efficient buildings is huge, as the total combined floor area of China's existing energy-efficient buildings amounts to less than 40 million square meters.

From 1999 to 2011, trilateral trade grew more than four-fold from 130 billion U.S. dollars to 690 billion U.S. dollars. China has been Japan and the ROK's largest trading partner for years while Japan is China's fourth biggest trading partner and ROK is China's sixth largest.

Although the GDP figure has further slowed from last year, other figures for March indicate that the economy's growth momentum started picking up, said Liu Ligang, director of the economic research department of ANZ Greater China.

The country will also push resource tax reforms forward in 2012 and promote property taxes on a trial basis, Xie said.

-- Investigations and studies were conducted on developing ethnic minority areas on the country's borders, urbanizing ethnic autonomous counties and banners, and providing Xinjiang with one-to-one assistance.