观察如图各图形：其中两个变量x、y具有相关关系的图是（　　）

如图所示，灯L上标有“9V  9W”的字样。只闭合S1时，灯泡L正常发光；只闭合S2时，L的实际功率是1W。则（灯泡电阻不变）（ ）

选择合适的选项，补全对话。

A. I usually play ping-pong with my friends.

B. What do you do on the weekend?

C. I like sports.

D. That sounds like a lot of fun.

Tom: ____

Jay: I often watch TV and play football.

Tom: ____

Jay: Yes. What about you?

Tom:____

Jay:____ Let's play ping-pong together next weekend.

Tom: OK!

读图 1“中国政区、主要粮食作物分布图”，结合图2、3，回答下列问题。