想一想，选择合适的数字。
小朋友们，下面是一首我们很熟悉的儿歌。一只青蛙一张嘴，两只眼睛四条腿…你能接着往下说吗?

One frog(青蛙) has one mouth, two eyes and four legs. Two frogs have mouths, eyes and legs. frogs have three mouths, eyes and twelve legs.