题目内容：
Theory that primitive man made involuntary vocal noises while performing heavy work has been called the __________ theory.
参考答案：
选择题：Theory that primitive man made involuntary vocal n
- 题目分类：信阳师范学院-英语语言学
- 题目类型：选择题
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A __________ is a structurally independent unit th
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