问题
问答题
Brain twister.（脑筋急转弯）
1. When do dogs have eight legs?
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2. What is black when it's clean but white when it's dirty?
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3. What letter is an anima ?
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4. What letter is a question?
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答案
1. When there are two dogs.
2. A blackboard.
3. Letter B (bee).
4. Letter Y (why).
答案不唯一