人们经常用____ 、____ 、____ 等来描述天气．天气是一个地区____ 里的大气状况，它是____ 变化的．

小颖使用计算器求30个数据的平均数时，错将其中一个数据15输入为105，那么由此求出的平均数与实际平均数的差是____ 

如图所示，对下列光学现象的描述或解释错误的是（     ）

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?