在直角坐标系xOy中，圆C：x²+y²+4x﹣2y+m=0与直线x﹣$\sqrt{3}$y+$\sqrt{3}$﹣2=0相切．

（Ⅰ）求圆C的方程；

（Ⅱ）若圆C上有两点M，N关于直线x+2y=0对称，且|MN|=2$\sqrt{3}$，求直线MN的方程．

A:Hello, David． ____

B:No, it's not mine．It's Neil's．

A: ____

B: He's my cousin．

A: ____

B：Yes, he likes it so much, and he is in the school basketball team (队)．

A：That's great． ____Do you like basketball?

B：No．I think it's difficult and boring, but I like tennis．

A：Let's go out and play tennis．

B：OK． ____