Spoken and written language: each has its own functions and characteristics. Of the following the choices, which are characteristics of spoken language?
选项：

A:It can directly be accompanied byother non-linguistic means as the aid.
B:It is generally speaking not as formal as the written language.
C:It permitserrors in the process of production.
D:Homophonescan be used for special stylistic effects, such as pun.