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《新唐书》记载：“唐制……日暮鼓八百声而门闭。五更二点鼓自内发，诸街鼓承振，坊市门皆启。”陆游《老学庵笔记》载：“京都街鼓今尚废，后生读唐诗文及街鼓者，往往茫然不能知。”唐宋街鼓的这一变化从一个侧面反映了（）。
A . 社会治安明显好转
B . 坊市制度已经崩溃
C . 都城人口急剧增长
D . 城市管理更加严格
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