1. 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?

A. four    B. Three    C. eight    D. six    E. two

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.