2. 外语
  3. I have a horse. Do you know what color it is? Tom said, "I guess it is not black. " Brian said, "It is either brown or grey. " C

I have a horse. Do you know what color it is? Tom said, "I guess it is not black. " Brian said, "It is either brown or grey. " C

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问题 I have a horse. Do you know what color it is? Tom said, "I guess it is not black. " Brian said, "It is either brown or grey. " Chris said, " I know it is brown. " I said, " At least one of you is right and at least one of you is wrong. " What is the color
选项
答案The horse is grey．
解析 (因为主人说三个人至少有一个正确，至少有一个错误。如果Chris正确的话，则三个人的回答都正确，因此马不是棕色的；如果Tom错误，则断定马是黑色，那么三个人回答都错。所以马也不是黑色；如果马是灰色，则Brain和Tom正确，Chris错误，符合主人的说法。故马是灰色的。)
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