A good abstract should（）.

A.be unified， coherent， and intelligible to a wide audience

B.strictly follow the style and formatting guidelines for authors

C.be error free

D.excludes any information that is not based on the content of the paper

正确答案：be unified， coherent， and intelligible to a wide audience；strictly follow the style and formatting guidelines for authors；be error free；excludes any information that is not based on the content of the paper