已知线段AB及AB上一点P，当P满足下列哪一种关系时，P为AB的黄金分割点①AP²=AB•PB；②AP=$\frac{\sqrt{5}-1}{2}$AB；③PB=$\frac{3-\sqrt{5}}{2}$AB；④$\frac{AP}{PB}=\frac{\sqrt{5}-1}{2}$；⑤$\frac{AB}{AP}=\frac{\sqrt{5}-1}{2}$．其中正确的是____ （填“序号”）

读一读， 选择句子补全对话。

A. They have breakfast at seven o'clock.    
B. What time do you get up?
C. I have breakfast at half past seven.    
D. I go to school at a quarter to eight.

Lisa: Hello, Pat.

Pat: Hi, Lisa. ____ 

Lisa: I get up at a quarter past seven. Then I brush my teeth and wash my face.

Pat: What time do you have breakfast?

Lisa: ____

Pat: Do your parents have breakfast at half pastseven too?

Lisa: No, they don't. ____

Pat: What time do you go to school?

Lisa: ____

著名作家柳青说：“人生的道路虽然漫长，但紧要处常常只有几步。特别是当人年轻的时候。”这句话启示我们（   ）