2. 外语
  3. A. The Process of Laughter. B. Why Laughter Developed? C. Laughter and Other Creatures. D. Mordern Breakthrough in Humour for Th

A. The Process of Laughter. B. Why Laughter Developed? C. Laughter and Other Creatures. D. Mordern Breakthrough in Humour for Th

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问题 A. The Process of Laughter.
B. Why Laughter Developed?
C. Laughter and Other Creatures.
D. Mordern Breakthrough in Humour for Therapy.
E. Various After-effects of laughing.
F. Anticipatorv Effect on the Immune System.
*
选项
答案F
解析 句意：期待中的笑声对免疫系统的作用。
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