Why is the boy four years old at home but two and a half on buses?

问题描述:

Why is the boy four years old at home but two and a half on buses?

为什么这个男孩在家是四岁,但在公共汽车上就是两岁半呢?
这好象是一个短文中的,表示家长想说假话,不卖车票的.