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.
A. seem to know how to control laughter B. reduce your blood pressure
C. why people laugh
D. the intake and release of air
E. the purpose of laughter is to reduce stress
F. the way it affects the immune system
选项
答案C
解析 见文中第一段第一句：Even after centuries of scientific research，no one knows for sure why human beings laugh。
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