乌龟喜欢主人的表现:Which is ciean when it is black and dirty when it is white?

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什么东西干净的时候是黑的， 脏了就白了

Blackboard. 黑板

Which is ciean when it is black and dirty when it is white? Which is false? Which game is good? Which is right" Which is right?Why? Which one is right? which answer is right? which sentence is wrong? which sentence is correct? condom..which is best?