15. A) By displaying their feelings and emotions. B) By exchanging their views on public affairs. C) By asking each other some personal questions. D) By greeting each other very politely.（C） 16. A) Yell loudly. B) Argue fiercely. C) Express his opinion frankly. D) Refrain from showing his feelings.（D） 17. A) Doing credit to one’s community. B) Distinguishing oneself. C) Getting rich quickly. D) Respecting individual rights.（B）