[解析]
答案:53.C 细节推理题.根据整篇文章内容及其第一段第一行句子A recently study found people's lives are made shorter in North China.一项调查表明华北地区的人均寿命在缩短.可知本文不是故事、广告和日记,应是一篇调查报告,故选C.
54.C 细节理解题.根据最后一段句子We need to improve our environment,although it might be expensive.我们需要改善我们的环境,尽管它可能是昂贵的.可知尽管代价可能会很大,人们也必须改善环境,故选C.
55.B 主旨归纳题.根据第一段第二行句子Our government has already done something.However,it doesn't seem to work so well.我们的政府已经做了一些事情,但似乎效果不太好"和第四段第一行句子Chinese government should strongly fight against air pollution.中国政府应该大力反对空气污染,可知我们的政府应该采取更多的措施来拯救环境,故选B.