四年级下习作2作文fffffffffffffffffffffffffffffffffffffffffffffffffff

问题描述：

四年级下习作2作文
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1个回答分类：语文 2014-12-10

问题解答：

我来补答

“耶!鸡蛋浮起来了!”从教室里传来了一阵欢呼声.这是怎么回事呢?原来大家正在做“让鸡蛋浮起来”的实验呢!
这次实验的材料很简单：一只盛满500毫升的清水烧杯,一枚生鸡蛋,一袋盐,一根搅拌棒.
实验开始了.只见丁老师小心翼翼地从包里取出一枚生鸡蛋,搁在烧杯边,一松手,鸡蛋就像一个跳水运动员做着姿势跃入水中.只听“叮叮”两声,鸡蛋沉入水底,远看,鸡蛋就像一个小胖子正在呼呼大睡呢!
然后,丁老师取出鸡蛋,飞快地撒入少许的盐,就像在下雪.一会儿,“雪”下完了,丁老师拿搅拌棒在水中搅着,立刻,水里就像盖了一层厚厚的地毯.没过多久,水里的盐就消失了,就像穿上了一件隐身衣,这时,水也变得非常清澈了.
接着,丁老师把鸡蛋放进水里,这时杨宇新说：“一定会浮的.”王天益则给他当头一棒,说：“一定会沉下去的.”我们班都支持杨宇新.这时,12双眼睛,24道目光齐刷刷地看着鸡蛋,生怕它逃走似的.王裕在那祈祷,我非常紧张,心都要提到嗓子眼了,还说：“鸡蛋一定要浮起来啊!”
结果鸡蛋真的浮起来了!我真高兴!

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