which is black when you buy it,red when you use it,and gray when you throw it away?猜一猜:

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whichisblackwhenyoubuyit,redwhenyouuseit,andgraywhenyouthrowitaway?猜一猜:whichisblackwhenyoubuyit,redw

which is black when you buy it,red when you use it,and gray when you throw it away?猜一猜:
which is black when you buy it,red when you use it,and gray when you throw it away?
猜一猜:

which is black when you buy it,red when you use it,and gray when you throw it away?猜一猜:
煤球coalball

coalball.

蜂窝煤```````coalball