Which of the following choice of designing PPT for presentation is correct？（ ） A: Using contrasting colors like light on dark or dark on light. B: Using all capital letters. C: Using old-style handwriting fonts. D: Using italics or underlines everywhere.

Using pictures and visual aids can help to attract the audience’s attention when giving a product presentation.

Which of the following can NOT help you catch the audience's attention? A: Telling the audience many stories. B: Mentioning your personal interest which is also related to the topic. C: Asking the audience some questions. D: Using some humor.

Which of the following statement about using quotation is incorrect?

中国大学MOOC:"The pictures or video clips that are used as visual aids can be sometimes irrelevant to the presentation topic.";