なぞなぞ１７

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Riddles are good for your brain. See how fast you can solve this riddle.


Today's riddle is

What is black when you buy it, red when you use it, and gray when you throw it away?
（買うときは黒、使うときは赤、捨てる時は灰色、これなんだ？）

Answer．

Charcoal
（木炭）

Could you solve the riddle correctly?

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Presented by For B English.

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