题目

— have Doris amt her husband lived in their old house?—For about 20 years. A . How long B . How often C . How soon D . How far 答案：A桌子上摆着9张卡片，分别写着1～9各数．如果规定摸到单数，小明赢；摸到双数，小芳赢．（1）这个游戏公平吗？（2）小明一定会赢吗？（3）请你设计一个公平的游戏规则．