每次写作业,我挪(nuó)动椅子时,总会发出刺(c)ì耳的响声,还把地板划出印子。时间长了,椅子腿底磨出了许多毛边。暑假的一天,妈妈卖废品时,一个开过的青霉素瓶子上的橡胶盖掉了下来,一点声音也没有。我灵机一动:把它垫(diàn)到椅子腿底下,不就没有噪(zào)音了吗?我找来钉子、锤(chu)í子和几个青霉素瓶子上的橡胶盖。我用力地把橡胶盖钉在 Every time I write a homework, when I move the chair, I always hear the noise of the ear, and I also draw the floor. A long time, the chair leg rubbed a lot of burrs. One day in the summer, when the mother sold the waste, the rubber cover on the opened penicillin bottle fell off, and there was no sound at all. I have a brainwiched: it pad it under the chair leg, there is no noise? I find a nail, hammer and a few penicillin bottle rubber cover. I pinched the rubber cap hard