Which of the following statement about abstract isNOTcorrect？

A.An abstract contains key words found in a research paper， thesis， or review.

B.Components of an abstract vary according to different disciplines.

C.An abstract is an excerpted passage from a research paper， thesis， or review.

D.The length of abstracts varies according to discipline and the length of the work.

正確答案：An abstract is an excerpted passage from a research paper， thesis， or review.