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?
收錄日期: 2021-04-13 17:04:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100129000051KK01328