选择正确的选项补全对话。

A. How many books do you have? B. What's in your bag? C. You have 16 books. D. What's this, Mike?

John:

Mike: My new bag.

John：

Mike: Pencils, rulers, pens and books.

John:

Mike: Open it and see.

John: 1,2. . . 15,16.

Mike: You have 16 books, too.