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题目内容
（信阳师范学院英语汉语学）
21
[填空题,4.3分] Theory that primitive man made involuntary vocal noises while performing heavy work has been called the __________ theory.
[填空题,4.3分] Theory that primitive man made involuntary vocal noises while performing heavy work has been called the __________ theory.
参考答案
