有害气体净化方法大致分为洗涤法、吸附法、袋滤法、静电法、（）和高空排放法。
参考答案：燃烧法
某发电厂上月烧煤2000吨，本月烧煤2250吨，增产了百分之几？
Every possible use of time should be ____ to look into the case. [ ]
A. used
B. made
C. built
D. taken
