One day， the phone rang， and a little boy answered.

"May I speak to your parents? "

"They're busy. "

"Oh. Is anybody else there? "

"The police. "

"Can I speak to them?"

"They're busy. "

"Oh. Is anybody else there? "

"The firemen. "

"Can I speak to them? "

"They're busy. "

"So let me get this straight -- your parent

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老师：“从甲地到乙地是五公里，从乙到甲是多少公里？”

学生：“不知道。”

老师：“唉，这么简单的问题都不懂！从乙到甲不也是五公里吗？”

学生：“你错了，儿童节到国庆节是四个月，而国庆节到儿童节难道也四个月吗？”