[简答题]Section C Laughter is a fundamental part of everyday life. It is so common that we forget how strange-and important-it is. Indeed, laughter is a "speaking in tongues" in which we’re moved by an unconscious response to social and linguistic cues. Stripped of its variation and nuance, laughter is a regular series of short vowel-like syllables usually transcribed as "ha-ha", "ho-ho" or "hee-hee". These syllables are part of the universal human vocabulary, produced and recognized by people of all cultures. Given the universality of the sound, our ignorance about the purpose and meaning of laughter is remarkable. We somehow laugh at just the right times, without consciously knowing why we do it. Most people think of laughter as a simple response to comedy, or a cathartic mood-lifter. Instead, after ten years of research on this little-studied topic, I concluded that laughter is primarily a social vocalization that binds people together. Students in my classes conf

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