How many major types of articles are mentioned in

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How many major types of articles are mentioned in the passage?

A. Five.

B. Seven.

C. Four.

D. Six.

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  • 答案:A

    由文章最后一段中的内容“Medical journals publish many types of articles. Research articles report the results of...Review articles summarize and analyze...Case conferences and case reports may be published in medical journals...Editorials in medical journals are...Letters to the editor provide a way for readers of...”可知,文章的类型有五种。