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