少兒簡(jiǎn)單英語(yǔ)謎語(yǔ)-What becomes white when it is dirty?

字號(hào):

英語(yǔ)謎面:What becomes white when it is dirty?
    參考翻譯:什么東西在它臟的時(shí)候變白?
    答案:A blackboard. 黑板