What is black when it's clean and white when it's dirty?
时间:2016-09-10 21:19 来源: 作者: 点击:谜语题目：What is black when it's clean and white when it's dirty?
谜语解析：什么东西干净的时候是黑色的，脏的时候是白色的。答案：黑板
谜语答案：a blackboard
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