英文謎語help me!thx!

2010-01-30 4:14 am
I'm hard and smooth.I'm as white as snow.
I can teach you things that you need to know.
I can't speak.I sit on the classroom wall.
One quick clean and I know nothing at all.

What is the answer for riddle?

回答 (2)

2010-01-30 5:01 am
✔ 最佳答案
white board
2010-01-30 7:59 am
應該係white board白板


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