填空题 Theory that primitive man made involuntary vocal noises while performing heavy work has been called the 1theory.
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【正确答案】 1、正确答案：yo一he—ho    
【答案解析】解析：语言的起源有“汪汪”理论，“噗噗”理论和“哟嘿吼”理论。“哟嘿吼”理论语言起源于原始人共同劳动时发出的有节奏的哼哟声。