D An archipelago (群岛)known for its Buddhist temples, the Tibetan capital and a seaside city known for corrupt real estate deals, are the only three cities in China to meet national air quality standards, in a stark(完全的)illustration of how pervasive (普遍的)pollution has become in the world’s most populous country. Unrelenting smog – including a week-long stretch last month of “hazardous” air in Beijing – has become a focus for public discontent, particularly in prosperous urban areas. Last week, Li Keqiang, China’s premier, told the annual meeting of the country’s legislature that his government would wage “war on pollution”. Haikou, the capital of sub-tropical Hainan Island, Zhoushan – an archipelago just south of Shanghai that consists of 1,390 islands and 1.1 million people – and Lhasa, the capital of Tibet,were the only three to meet national standards in a survey of 74 of the nation’s largest cities,vice-minister of environmental protection Wu Shaoqing told journalists at the weekend. Of the 10 worst cities, seven were in Hebei, the industrial province that rings Beijing where winter pollution levels regularly go off the scale. Last year, China issued a plan to cut emissions and polluting steel capacity in the populous east – particularly in Hebei – while encouraging more coal and industrial development in the poor and arid west of the country. Hebei officials have hastened to demonstrate their commitment by inviting state television tofilm the detonation of steel mills and cement plants. But steel industry officials say most ofthese blown up were already closed due to high debt levels and poor profitability, throwing doubt over any long-term impact on pollution levels. 63.What did Li Keqiang do in terms of air pollution according to the passage?