填空，概括文章的主要内容。
Public speeches are speeches delivered in public for
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. There are different kinds of speeches, such as impromptu speeches, extemporaneous speeches, speeches from reciting, speeches from
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, etc. In order to arouse the interest of the audience and to obtain their support,
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or consent, the speaker will have to appear to be
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to the audience and use
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to make his speech persuasive, engaging and
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. Public speeches are strongly influenced by the
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of the written language. Generally speaking, the language used in public speeches is formal in
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, clear and vivid in
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, and persuasive in
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.
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