Technically, ' extemporaneous' means the same as 'impromptu'. 
A: 正确
B: 错误
                    A: 正确
B: 错误
举一反三
- 中国大学MOOC: Technically, extemporaneous means the same as impromptu.
 - Extemporaneous method gives more precise control over thought and language than impromptu speaking. A: 正确 B: 错误
 - 中国大学MOOC: Extemporaneous method gives more precise control over thought and language than impromptu speaking.
 - A synonym is a word or phrase that means exactly or nearly the same as another word or phrase in the same language. A: 正确 B: 错误
 - An extemporaneous speech is carefully prepared and practiced in advance. A: 正确 B: 错误
 
