Answering questions is essential and is one of the presentation, whether before or after the presentation, the presentation is finished, it will have the audience curious questions or wants to say who he wants to ask the audience which, depending on whether the speaker's presentation is so much easy to understand. If the audience confused and don't understand it, you will be asked to provide a clear answer. Therefore, the questions and answers is one of the basic factors of the presentation depends on the time to prepare questions to ask and not ask it, or depending on the speaker and the audience.
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