题目内容
It's unnecessary to use signal words to mark movement from one topic to the next or indicate a shift in perspective.
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We should use animation and decorations as much as possiblein Powerpoint.
A handout is a simple way to help people remember what you have said, which may contain an outline of your remarks.
Impromptu is a planned spontaneous presentation.
If a person asks a question that you don't understand, you may just ignore it.
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