①MnO₂+H₂O₂+2H⁺=Mn²⁺+O₂↑+2H₂O   

②Mn²⁺+H₂O₂=MnO₂+2H⁺

下列说法正确的是（   ）

北伐军出师不到半年，就从珠江流域打到长江流域，实现了“饮马长江”的誓言，其最主要的原因是（  ）

图中甲图的a是闭合电路的导体在磁场中的横截面，⊙表示导体按箭头运动时产生的感应电流方向．根据甲图的情况标出乙、丙中○内的感应电流方向。

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?