✔ 最佳答案
1.It depends on what ocassion and what topic you'r talking about. If you are opposing something, you speak like debating is ok, but if you are giving a speech in order to raise fund, convey educational messages, you have to be humble.
2.It depends on your audience, general public?kids?elderly?educated?
2006-12-04 18:33:28 補充:
3.It depends on your position in contrast to the audience (they are over you or under you or just on the same level.)