Hospitality

Mother apologized to her unexpected guest for serving an apple-pie without any cheese.
Little LiPing left the room quietly for a moment and returned with a piece of cheese which he laid on the guest's plate.
The visitor smiled,put the cheese into his mouth and then said:"you must have better eyes than your mother,sorry.Where did you find the cheese?""In the rat-trao,sir"replied LiPing .

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