数据结构是对数据系统的静态物性的描述，______是以数据库系统的动态特性的描述。

根据短文内容从下列方框的五个选项中选出四个适当的句子还原到原文中，使短文意思通顺、结构完整。
Nina is 8 years old. One day, she brings her report card home from school. She gets good marks (分数). 1.
However, her teacher writes on the report card: "2.          , but she talks too much in class. 3.          . I think it may help her change this bad habit. "
Nina’ s dad signs (签字) the report card. 4.         : "I want to know your idea, I would like to try it out on Nina’ s mother!"

A. I have an idea B. Nina is a clever little girl C. There are many "A" s on it D. He writes a note on the back E. Nina’ s mother talks too much