Theory that primitive man made involuntary vocal noises while performing heavy work has been called the______theory.

A.

【参考答案】

yo-he-ho
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......

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