题目内容：
Then I saw in my dream, that when they were got out of the wilderness, they presently saw a town before them, and the name of that town is Vanity; and at the town there is a fair kept, called Vanity Fair; it is kept all the year long; it bearth the name of Vanity Fair because all that is there sold, or that cometh thither, is vanity. As is the saying of the wise, .All that cometh is vanity..Questions:
A. Identify the author and the title of the book.
B. Who are "they" in this excerpt?
C. What type of writing is this book?
D. What is the theme of this book?
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