苍蝇对人体健康的危害很大。它携带大量病菌,传播多种疾病,特别是消化道传染病,苍蝇是主要祸根。即使在寒冷的冬季,苍蝇也没有完全死掉,只是大家看不见它的行踪罢了。大多数躲在温暖避风的菜窖、暖气沟、下水道、墙缝、天棚等处过冬。冬过春来,天气渐暖,苍蝇也就开始活动。苍蝇的繁殖与温度有密切关系,气温越高繁殖越快。一只苍蝇一年可以繁殖十几代,每次产卵100个以上,一生繁 Flies harmful to human health. It carries a large number of bacteria, spread a variety of diseases, especially gastrointestinal diseases, flies are the main curse. Even in the cold winter, the flies did not die completely, but we can not see it’s whereabouts. Most hiding in the warm shelter of the cellars, heating ditch, sewers, wall joints, ceiling, etc. winter. Spring and winter come, the weather getting warmer, flies also began activities. Flies breeding and temperature are closely related, the higher the temperature breeding faster. A flies can breed a dozen generations a year, each laying more than 100, life complex