问题标题：
【Youprobablyknowyoushouldsay"please"and"thankyou"atrestaurants.Youprobablyknowtherulesofalibrary.Youknowyoushouldrespectandbenicetoyourclassmates.Butdoyouhavemusicmanners?Keepitdown!Youhavetonoticethevolume】
问题描述：
【Youprobablyknowyoushouldsay"please"and"thankyou"atrestaurants.Youprobablyknowtherulesofalibrary.Youknowyoushouldrespectandbenicetoyourclassmates.Butdoyouhavemusicmanners?Keepitdown!Youhavetonoticethevolume】
李延斌回答：
31-35BADAB
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