A folk culture is small isolated, cohesive, conservative, nearly self-sufficient group that is homogeneous in custom and race with a strong family or clan structure and highly developed rituals.
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【正确答案】 1、正确答案：冠词缺失，应在small前面加上不定冠词a。    
【答案解析】解析：中心词group为单数名词，因此应在small前面加上a。