大气污染,已成当前世界上的一大公害,受到社会的普遍关注。由于工农业生产的迅速发展,环境污染已由城市向农村蔓延。一是农民为了提高农产品产量,不断加大农药、化肥、除草剂等的施用量,使大气、水源和土壤遭到不同程度的污染。尤其是剧毒农药的大量施用,使许多农村飞鸟绝迹。就连原来数量多得惊人的麻雀,也 Air pollution has become a major public hazard in the world and is receiving widespread public concern. Due to the rapid development of industrial and agricultural production, environmental pollution has spread from cities to rural areas. First, in order to increase the output of agricultural products, peasants have been constantly increasing their use of pesticides, fertilizers and herbicides to pollute the atmosphere, water sources and soil to varying degrees. In particular, a large number of highly toxic pesticides application, so that many rural birds flying extinct. Even the original number of amazing sparrow, too