Reading from a manuscript doesn't need any skill.
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You should concentrate on the words in your speech when you recite from memory.
A. 对
B. 错
There are four steps you can follow when you try to speak impromptu.
A. 对
B. 错
Speaking impromptu means the same as speaking extemporaneously.
A. 对
B. 错
what the preparation outline should be like?
A. brief
B. detailed