The teacher asked her students in class: "If there are five flies on your desk and you kill one, how many will remain?"

　　"One," shouted a boy, "the dead one." The teacher said: "You should know that there are still four not dead."

　　The boy replied: "I know, but they have flown away."

　　He is right. Arithmatic is one thing, but logic1 is another.

　　上課時老師問學生：“如果有5只蒼蠅在你的書桌上，你打死了一只，還剩下多少只？”

　　“一只，就是死了的那只。”一個男孩大聲回答道。老師說：“你應(yīng)該知道還有4只沒有死嘛。

　　男孩回答說：“我知道，可是它們已經(jīng)飛走了。

　　他是對的，算術(shù)是一回事，而邏輯是另一回事。