使得函数$f\left(x\right)=\frac{1}{5}{x}^2-\frac{4}{5}x-\frac{7}{5}\left(a\le x\le b\right)$的值域为$a,b\left(a<b\right)$的实数对$\left(a,b\right)$有(    )对

A: Hello,Lily. ____?

B: I' m going to have a party for my 14th birthday this weekend.

A: Oh, that's wonderful! ____?

B: I will have it at home. ____? I'll be happy if you can come.

A: Sure, I'd love to. And I'll bring some cakes made by my mom. She's good at baking (烘焙), you know.

B: Thanks.

A: ____ ?

B: It will start at 10 o'clock on Saturday morning. After that, how about going to the park?

A: ____! We can fly a kite there.

B: OK. See you then.

阅读下列材料：

材料一“东方红，太阳升，……他为人民谋幸福，呼儿咳呀，他是人民的大救星。”

——选自歌曲《东方红》

材料二“一九七九年，那是一春天，有一位老人在中国的南海边画了一个圈，神话般地崛起座座城……一九九二年，又是一个春天，有一位老人在中国的南海边写下诗篇……”

——选自歌曲《春天的故事》

请回答：