Why do flies rub their feet?

The fly has no nose, but it has another taste organ, and it is not on the head and face, but on the feet. As long as it flies to food, first taste the food with the taste organs on the feet, and then eat it with the mouth. Because flies are greedy and like to fly around, they should taste everything they see. In this way, there will be a lot of food on their feet, which is not conducive to the flight of flies and hinders their taste. So flies rub their feet to get rid of food. Because flies have this bad habit, they can be infected with many germs. If flies stand in feces and sewage and fly to food, they will leave germs on the food. In addition, flies have a worse habit, that is, when they land on food, they not only eat food, but also excrete feces, leaving some live germs and parasite eggs in the intestines. If people eat such food, it is easy to get sick, affecting their health and even endangering their lives. On a whim, the boss saw a small fly with a green shell standing there stupidly, so he asked me to cover it with a disposable cups. So I caught it. We sealed the mouth of the cup with paper to prevent it from leaking. I saw it flying around, bumping for the exit, and often rubbing its hands and feet. I didn't understand why, so I asked Baidu. It turns out that the nose of a fly grows on its legs, and rubbing its feet is equivalent to picking its nostrils! This is one of the most disgusting creatures! On a whim, the boss picked up a cup and dangled it around. I said, why do you look like a thirty-year-old married woman? Flies are fun, right? She was silent for a while and said something super disgusting: this green shell fly is really beautiful! I almost threw up while eating. Can it turn green unless it eats shit especially? I turned blue after hearing this, and the boss wanted to praise me. A day later, the fly died of depression. If it is Xiao Qiang, I dare say "delicious". Step on it and you can turn over and catch your breath in an hour. The next day, I saw a bigger fly with a hairy belly and legs, so I caught it yesterday and prepared to give it to my boss the next day. I punched a lot of holes in it at lunch, but it died the next day. TT also laughed at me and said that my mother couldn't lick rice (your mother forced me) ... This boring thing just filled the gap in the diary and wrote a poem: Everyone is punished for the four pests of flies.