A cat  chase a mouse in the night,suddenly,the mouse drived into a hole which have two exits, the cat guard the one exit, the mouse can escape from the other exit .unfortunately,the mouse do not know which exit is guarded.sometimes,good luck helps keep things in perspective,there are two small mice in the hole,and they know which exit the cat guard.the two small mice have a eccentric character,the one talk with flam,but the other ture,the mouse do not know which the small mouse speak flam,and that is the key.    The  question: Hou the mouse to ask the two small mouse one question ,and he will know where is the safe passage.

                 matters need attention: Allow ask one question!!!