在一年一度的“安仁春分药王节”市场上，小明的妈妈用280元买了甲、乙两种药材．甲种药材每斤20元，乙种药材每斤60斤，且甲种药材比乙种药材多买了2斤．设买了甲种药材x斤，乙种药材y斤，你认为小明应该列出哪一个方程组求两种药材各买了多少斤？（）

A: Good morning, Bill.

B: Hi, Nick.

A: ____

B: Yes, I like playing basketball. How often do you exercise?

A: ____

B: Do you get up early in the morning?

A: Yes, I get up at 6:30 every morning. And then I play basketball for half an hour.

B: ____

A: I go to bed at 10:00. ____

B: I see. You look strong. Let's play basketball together tomorrow morning, OK?

A: All right. ____ See you.

B: See you tomorrow.

结合上述材料，分析宝钢获得成功的原因。