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._____

浮选柱泡沫冲洗系统主要作用是（）。

A、消泡精矿产品流速

B、调整矿浆浓度

C、减少夹带杂质

D、控制泡沫层厚度