从方框内A~G 选项中选出能填人空白处的最佳选项补全对话。（有两项为多余选项）

Amy: __1__ I have a driving lesson.

Jack: Cool! __2__

Amy: Once a week.

Jack: Do you like watching F1 matches, then?

Amy: __3__

Jack: There's an F1 match tonight.

Amy: __4__

Jack: __5__

1.______ 2.______ 3.______ 4. ______ 5. ______

A. That's good.

B. That's too bad.

C. How often do you take the lessons?

D. I have to go.

E. Yes, I really do.

F. How many cars do you have?

G. I know, but I have much homework to do.

规模报酬是指在技术水平不变的条件下，当各种生产要素按相同比例增加，即生产规模扩大时（　　）的变化情况。

A．经营成本

B．经营利润

C．销量

D．产量