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A
解析 见最后一段第二、三句，句中提到动物在笑时不能控制呼入和吸出的气流，可以推知，这种能力的欠缺使它们不能控制笑声，故只有人类才能控制笑声。
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