A、 the number of researches covered in the article
B、 the literature section
C、 the difference between primary research and secondary research
A、 the debates existing in a certain research area
B、 the results achieved in a certain research area
C、 new and future development in a certain research area
A、 different properties of one technology
B、 different stages of development of a technology
C、 different ideas and opinions towards one conduct
A、 authors of the reviewed articles
B、 the timeline of the reviewed contents
C、 the scope of the reviewed contents
A、 discussion section
B、 conclusion section
C、 main body section
A、 the reviewed details
B、 the conclusion
C、 the background
A、 some research works published in the last years on this subject indicate…
B、 considerable researches were conducted
C、 the focus of this review paper is on…
A、 sub-sections with sub-tiles
B、 some key words
C、 some directions
A、 some lexical signals
B、 the author’s writing style
C、 each paragraph
A、 the reviewed focus
B、 what is needed to be done in the future
C、 the reviewed problem