根据对话情景, 在横线上填入适当的单词补全对话。

A: Mary, what do you ____ of your new school?

B: I like it very much. But there are too ____ rules.

A: What are the rules?

B: First, girls can't have long hair.

A: What? That's really an ____ rule.

B: Interesting? I think it's awful.

A: Do you have to cut your hair?

B: Yes, I do.

A: What ____ rules does your school have?

B: We can't ____ sunglasses. I can't stand (容忍)that. Sunglasses are my favorite.

A: That's a terrible rule.

（Ⅰ）若a、b、c依次成等差数列，且公差为2．求c的值；

（Ⅱ）若c= $\sqrt{3}$ ，∠ABC=θ，试用θ表示△ABC的周长，并求周长的最大值．

下列事例中，不属于静电现象的是（　　）