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What is black ,英语谜语

时间:2010-03-31 14:17:00 来源:怡心草 作者:英语谜语 点击:572
What is black ,英语谜语
谜题是:What is black when it is clean and white when it is dirty?
(打一物体)
 
 
 
 
 
答案是:A blackboard黑板