给出下列句子的对应回答。

(1) A: Good morning.

     B:                               

(2) A: Good afternoon.

     B:                               

(3) A: Good evening.

      B:                               

(4) A: How are you?

      B:                               

(5) A: Nice to meet you.

      B:                                

对有n个记录的表r[1…n]进行直接选择排序，所需要进行的关键字间的比较次数为______。