Which of the following is NOT Mark Twain’s works（）

单项选择题Which category of writing does the text belong to（）

A.Narration.
B.Description.
C.Persuasion.
D.Exposition.

单项选择题The author quoted a few entries in the last paragraph to（）

A.illustrate some features of the DNB
B.give emphasis to his argument
C.impress the reader with its content
D.highlight the people in the Middle Ages