题目

完形填空。从A、B、C、D四个选项中选出最佳答案。 Mr. Smith lived in a village（村庄）. He had a few farms（农场） and about twenty people working for him. He often told them 1hard and be honest(诚实的). One day he went to a farm and worked with the workers there. Soon it was time 2 lunch. He put 3 nice bread on the table and went out. A few minutes later, he came back again but he couldn't find the bread. Who ate 4 on the table? he shouted. Some of the workers answered, We didn't. The others said, We saw nothing. Well, said Mr. Smith, 5 are a lot of mice(老鼠) 在某次花样滑冰比赛中，发生裁判受贿事件，竞赛委员会决定将裁判由原来的9名增至14名，但只任取其中7名裁判的评分作为有效分，若14名裁判中有2人受贿，则有效分中没有受贿裁判的评分的概率为_____________.