A fourth-grade teacher was giving her pupils a lesson on logic¹.

Here is the situation, she said. A man is standing² up in a boat in the middle of a river, fishing. He loses his balance, falls in, and begins splashing and yelling for help.

His wife hears the commotion³, knows that he can't swim, and runs down to the bank. Why do you think she ran to the bank?

A girl raised her hand and asked, to draw out all of his savings⁴?

小学四年级的教师正在给学生们上一堂逻辑课。她举了这么一个例子：有这样一种情况，一个男人在河中心的船上钓鱼，突然失去重心掉进了水里。于是他开始挣扎并喊救命。

他的妻子听到了他的喊声，知道他并不会游泳，所以她就急忙跑向河岸。谁能告诉我这是为什么？ 一个女生举手答道，是不是去取他的存款？