下列关于月球的叙述中，正确的有    (    )

小明应用如图甲所示的电路“探究定值电阻R₀的发热功率P₀、滑动变阻器R消耗的电功率P_R和电源总功率P_U随电流I变化的关系”，将得到的数据绘成a、b、c三条图线画在了同一坐标系中，如图乙所示，b图线表示定值电阻R₀的发热功率P₀随电流I变化的关系，则表示“电源总功率P_U随电流I变化的关系”图线是____ ．如电源电压U保持不变，则由图象可知：电源电压U为____ V，定值电阻R₀的阻值为____ Ω．

在酸性条件下，向硫酸锰（MnSO₄）溶液中滴加高碘酸钾（KIO₄）溶液，溶液颜色会变为紫红色，生成高锰酸钾（KMnO₄）．试完成下列相关题目：

根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，其中有两个为多余选项。

(Rose and Ann are talking about chores.)

Rose: Ann, could you please get me some water?

Ann: Sure. ____ 

Rose: I'm sweeping the floor.

Ann: Do you like it?

Rose:  ____It's too boring, but I have to do it. How about you?

Ann: I hate sweeping the floor, too, but I like other chores. 

Rose: Really?____ 

Ann: I like to make the bed and water the flowers.

Rose:____   

Ann: Yes.____  And you?

Rose: I agree. I often help my mother do the dishes.

A. I think it's relaxing.

B. Do you like doing the dishes?

C. What do you want to do?

D. No, not really.

E. What are you doing now?

F. Yes, it's very interesting.

G. What chores do you like?