补全对话。

A: Hello, Mike! May     1     ask you questions?

B: Certainly.

A: When were you      2    ?

B: On October 20th, 1987.

A:      3      were you born?

B: In a small town near London.

A:     4     did you live there?

B:     5     about five years,      6    we moved to France.

A: Why did you move there?

B: Because my father found work there.

A: When did you come to China?

B: Two years     7    .

A: Do you enjoy     8     here?

B: Sure. The people here are very friendly to us. And the food is good, too.

A: That's great. Good luck     9     you.

B: Thanks a lot.

1._____2._____3._____4._____5._____

6._____7._____8._____9._____

在数据管理技术的发展过程中，经历了人工管理阶段、文件系统阶段和数据库系统阶段。其中数据独立性最高的阶段是______。

A．数据库系统

B．文件系统

C．人工管理

D．数据项管理