Teacher:Some students are becoming arrogant.Do you remember the story about race between the hare and the tortoise?Now,Xiaoming,will you please tell us why the hare was defeated by the tortoise?

Xiaoming:Because the hare fell asleep.

Teacher:Absolutely right!What should we do so that the hare won't fall asleep?

Xiaoming:Exchange the tortoise for the wolf.
老师：有些同学开始骄傲了，大家还记得龟兔赛跑的故事吗。小明，你说说看，兔子为什么输给乌龟？
小明：因为它睡觉了。
老师：对极了！我们应该怎么做才能让兔子不睡觉呢？
小明：把乌龟换成狼！