英语笑话: How do you know

　　betty:"Black hens are cleverer than white ones, aren't they?"

　　贝蒂：“黑母鸡比白母鸡聪明，对吗?”

　　Larry:"How do you know?"

　　拉里：“你怎么知道?”

　　Betty:"Well, the black hens can lay white eggs, but the white hens can't lay black ones."

　　贝蒂：“嗯，因为黑母鸡能下白蛋，可白母鸡不能下黑蛋。”

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