“叮铃铃”伴随着上课铃声,科学老师迈着轻盈的步伐走进了教室。同学们几乎同时发出“咦”的惊讶声。我抬头一看,只见老师左手拿了一杯满满的水,右手拿了一大袋1角硬币。我见了也是丈二和尚摸不着头脑:“老师葫芦里到底卖的什么药?”同学们百思不解,在一片疑惑声中,老师为我们解释:“今天,我们来做一个实验。”只见老师解开塑料袋,拿出一枚硬币,小心翼翼地放入水中,看着晃晃悠悠下沉的硬币,同学们为水会不会溢出这个问题在激烈地讨论着。随着 “Jingle Bell ” With the classroom ringtones, science teacher walked lightly pace into the classroom. At the same time, the students issued “咦 ” in surprise. I looked up and saw the teacher took a cup of water in his left hand, right hand took a big bag of 1 coin. I met Zhangzhang monk scratching his head: “Students in the gourd in the end what medicine?” Students puzzled, in a doubt, the teacher explained to us: “Today, we do an experiment. ” I saw the teacher unzipped the plastic bag, took out a coin, cautiously into the water, watching the sinking coin sinking, the students will not overflow the water in the heated discussion. along with