根据对话内容，补全对话

A: What can I do for you?

B：I want to buy a pair of shoes.

A:____

B: Size eight or nine.

A: Ok! How about this pair?

B: Sorry, I do not like black.____

A: Yes. We have blue, white and brown ones .

B: Can I havea look at the brown ones?

A: Yes, please.

B: ____

A: Forty-sixyuan.        

B: It is too expensive. ____

A: How about forty?    

B: It is still expensive. What about thirty-five?

A: All right.

B: OK.____

矩形ABCD的两条对称轴为坐标轴，点A的坐标为（2,1）.一张透明纸上画有一个点和一条抛物线，平移透明纸，这个点与点A重合，此时抛物线的函数表达式为y=x²，再次平移透明纸，使这个点与点C重合，则该抛物线的函数表达式变为（    ）

已知a=$\left(\frac{1}{5}\right)-\frac{1}{2}$，b=log₅$\frac{1}{3}$，c=${\log }_{\frac{1}{5}}\frac{1}{3}$，则a，b，c的大小关系是（　　）