问题描述：
What has hands but no feet ,a face but no eyes,tell but no talk/
What is black when it is clean and white when it is dirty?
what does everybody do at the same time?
how long should you legs be?
what has four legs and a back but can't walk?
What is black when it is clean and white when it is dirty?
what does everybody do at the same time?
how long should you legs be?
what has four legs and a back but can't walk?
问题解答：
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