Recently,the topic of air pollution has again aroused more and more attention since pollution haze,a kind of weather,has appeared increasing frequently in our cities.Just as the picture showed,when pollution haze comes,the whole city was covered with suspended particles which can breath into our body causing heavy problem to our health. 　　Due to the bad effect from pollution haze,a gre    （共 1058 字）     [閱讀本文] >>