补全对话。

W: Hi, Sam! 1________.

M: I’m reading a book about magic(魔术).

W: 2_____      ?

M:. Yes, I like magic very much. My favorite magician is Liu Qian.

W: Do you want to be a magician?

M: 3________. I just want to know how he does his magic.

W: Magic is really interesting. I want to buy a book about magic, too. 4________ ?

M: In the Xinhua bookstore.

W: Can you go to the bookstore with me now?

M: 5________ . How about tomorrow afternoon?

W: Ok. Thank you.

数据库系统的三级层次模型中描述数据库中全体数据的逻辑结构和特征是( )。

A．内模式

B．模式

C．外模式

D．存储模式