【试题设计】阅读下列图文材料,回答问题。材料一2015年2月2日,国家环保部公布的2014年全国污染最严重的城市中,京津冀地区13个地级及以上城市中,有8个城市位列全国空气质量较差城市前10位,PM2.5是首要污染物。2014年11月北京在召开“APEC峰会”期间,采取了一系列措施治理空气污染,并取得了显著成效,人们将北京美丽的蓝天称为“APEC蓝”。材料二近年来,河北省通过大力发展钢铁、水泥等重化工产业获得GDP持续增长(见图1),能源结构以 [Test design] read the following graphic materials, answer questions. Materials On February 2, 2015, among the cities with the most serious pollution in China announced by the Ministry of Environmental Protection in 2014, 8 of the 13 prefecture-level cities and above in the Beijing-Tianjin-Hebei region ranked among the top in China’s cities with poor air quality 10, PM2.5 is the primary pollutant. In November 2014, Beijing held a series of measures to control air pollution during the “APEC Summit” and achieved remarkable results. People called Beijing’s beautiful blue sky “APEC Blue”. Material II In recent years, Hebei Province achieved sustained growth in GDP through vigorously developing heavy chemical industries such as steel and cement (see Figure 1). The energy structure