题目内容：
谜语：what is black when it's clean and white when it's dirty ? 什么东西干净的时候是黑色的，脏的时候是白色的。
参考答案：
问答题：谜语：what is black when it's clean and white when it's dirty ?
- 题目分类：英语谜语
- 题目类型：问答题
- 查看权限：免费
谜语：what animal is taller sitting down than standing up? 什么动物
谜语：what animal is taller sitting down than standing up? 什么动物坐着比站着高?
谜语：what will you break once you say it? 什么东西你说出来就打破了它?
谜语：what will you break once you say it? 什么东西你说出来就打破了它?
谜语：what's too much for two and just right for one? 什么东西对两个人来
谜语：what's too much for two and just right for one? 什么东西对两个人来说太多，一个人刚刚好?
谜语：what can pierce one's ears without a hole?什么东西能穿透一个人的耳朵而不
谜语：what can pierce one's ears without a hole?什么东西能穿透一个人的耳朵而不留下一个洞?
谜语：when can you get water with a net?什么时候你可以用网拿到水呢？
谜语：when can you get water with a net?什么时候你可以用网拿到水呢？