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!
与圆 
相交的所有直线中，被圆截得的弦最长的直线方程是（ ）