第22题: [单项选择]The passage is mainly about ______. A. attempts to find efficient ways of recycling wastes B. efforts to protect the environment in British cities C. a good way to locate plants for waste recycling D. a cheap way to get energy from waste materials 参考答案:A 答案解析:主旨题。文章各段阐述的都是关于废物处理和再生的问题,故答案为A。