“子欲养而亲不待”的意思是：当子女想到要孝敬父母的时候，父母却不健在了。这启示我们（  ）

根据短文理解，完成下列各题。

A

    Annie is a neighbor's daughter. When her birthday month came around I found out she felt blue and lonely.

    Her family is quite small and kind of poor so there wouldn't be any birthday visitors. I wanted to send her a card and maybe a small gift to make her happy.

    I told some of my friends I would like to have a birthday party for the girl. I asked them for help. Then I bought some small presents, a cake and something else.

    When the day came, my friends and I went to her house. When she got home after school, we gave the presents to her and wished her a happy birthday.

    It was so easy to do something helpful. My friends helped take the party. They still laugh and talk about it. And Annie tells me she likes the birthday very much and she can still remember it!

西欧封建等级制度中，____是贵族中的第一等级。