A、A short presentation clearly delivered. B、A package of ideas formally presented. C、A clever use of visual aids in presentation

The speech delivery style of Europeans and Asians tends to be very formal. Speakers of these cultures often read oral presentations from carefully written manuscripts. On the other hand, American speakers are generally more informal relative to speakers in other cultures. American audiences prefer natural, spontaneous delivery that conveys a lively sense of communication. They don’t relate well to speakers who read from a manuscript. If you use an outline of your ideas instead of a prepared text, your speech will not only sound more natural, but you will also be able to establish better relationship with your listeners and keep their attention. The language and style you use when making an oral presentation should not be the same as the language in style you use when writing. Well-written information, that is meant to be read, does not work as well when it is heard. It is, therefore, important for you to adapt written texts or outlines for presentations. Good speakers are much more informal when speaking than when writing. They also use their own words and develop their own speaking styles. Whenever possible, they use short words. Listeners are appreciated when speakers use simple, everyday words in a presentation. One advantage is that it is much easier for speakers to pronounce short words correctly. Another is that long and sophisticated vocabulary choices make listening more difficult.
20. What does the speaker say American audiences prefer?
21. What should one pay attention to when making an oral presentation?
22. What does the speaker focus on in the talk?