In the morning, the sun is shining, the air is fresh, the roads are lined with trees, birds are singing happily in the branches, and everything is so beautiful. In the distance, two junior students are humming. One is Xiao Ming and the other is Xiao Li. Suddenly, they covered their noses in unison. What's that smell? Oh, there's a pile of smelly garbage ahead. Xiao Ming said, "Who threw this? It's evil. Let's go to school. " Xiaoli said, "No, put the garbage in the trash can, or it will affect others." Let's clean together. "Xiao Ming said," haven't you heard of it? It's none of your business. Hang high. " Having said that, he saw Xiaoli so determined that she couldn't help herself. In a short time, the garbage was cleaned up by both of them, but Xiao Ming felt that something was missing. He is about to turn around and go to school. Suddenly, he had a brainwave, took out paper and pen from his schoolbag, neatly wrote the words "civilization-one step away" on it, and then posted it on the trash can. Two good friends smiled at each other and set foot on the road ahead. In a flash, they felt that the sky was bluer, the grass was greener and the clouds were whiter.