最近,我和妈妈出门时,发现我们楼道变得干净多了,原先扶手上厚厚的一层灰不见了。咦,这是谁干的呢?这天早晨,我起得较早,听到门外传来“刷——刷——”的声音。我想:是哪个“无名英雄”?打开防盗门时,我在楼梯拐角处看到一个矮小的背影。哦,不是清洁工,是和我一样的小学生在做好事。妈妈送我上学时,我又看到那个背影出现在我的眼前,小小的他正吃力地拉着一辆装满垃圾的车子,我连忙上前帮他推。可能是他感觉到没那么吃力了,于是扭过头来看。看到他的脸, Recently, when I and my mother went out, we found that the corridor became much cleaner, and the thick layers of the original armrests were gone. Hey, who did this? I got up earlier this morning and heard a “brush-brush-” sound outside. I think: Which “unknown hero ”? When opening the security door, I saw a small back in the corner of the stairs. Oh, not a cleaner, a pupil like me is doing good. When my mother sent me to school, I saw that back in my eyes. The little one was struggling to carry a rubbish-filled car, and I hurried forward to help him push. Maybe he did not feel so strenuous, so he turned around and looked. See his face