题目

Beijing, with co-host Zhangjiakou in neighboring Hebei Province, won the bid for the 2022 Winter Olympics. Winning the bid will benefit the capital as well as its residents(居民)，so the below are something to expect from the Winter Olympic Games. Blue skies Efforts to control pollution ahead of the 2008 Games dramatically improved the air quality in Beijing, at least for a while. Once again, expectations are high that staging the Winter Olympic Games will push Beijing to reduce pollution and improve the air quality more effectively. Beijing began carrying out a five-year plan from 20古人钻木取火是通过的方式来改变物体内能的．