I never thought I would have a lifechanging experience at WalMart.
Although my thoughts were only on speed，the checkout line I was standing in wasn’t moving as quickly as I wanted，and I glanced toward the cashier.
There stood a man in his seventies，wearing glasses and a nice smile.I thought，well，he’s an old guy!
For the next few minutes I watched him.He greeted every customer before scanning the items.Sure，his words were the usual，“How’s it going？” But he did something different—he actually listened to people.Then he would respond to what they had said and engage them in brief conversation.
I thought it was odd.I had grown accustomed to people asking me how I was doing simply out of robotic conversational habit.After a while，you don’t give any thought to the question and just mumble something back.I could say，“I just found out I have six months to live，” and someone would reply，“Have a great day！”
But that wasn’t the end.
He gave them the change，walked around the counter，and extended his right hand in an act of friendship.He looked the customers in the eyes.“I sure want to thank you for shopping here today，” he told them.“You have a great day.Byebye.”
The looks on the faces of the customers were priceless.There were smiles and some sheepish grins.All had been touched by his simple gesture—and in a place they never expected.They would gather their things and walk out，smiling.
Of course，he did the same to me and I got to know his name，Marty.
Who was that guy？It was as if Sam Walton had come back from the dead and invaded this old guy’s body.
I had never walked away from that shop feeling like that.
小题1:The checkout line the writer was standing in moved slower than expected because ________.
A．the cashier couldn’t work as fast as others
B．there were some big purchases
C．the cashier did more than scanning the items
D．the writer was not patient enough小题2:According to the writer，when common people ask you “How’s it going？” ________.
A．they don’t really care what you may answer
B．they are just practicing their conversation ability
C．they are inquiring about your private information
D．they don’t expect to hear any negative answers小题3:What was most customers’ reaction to Marty’s behaviors?
A．They thought it priceless.
B．They were in some way moved.
C．They thought it awful and odd.
D．They felt somewhat offended.小题4:What does the writer intend to express through the text?
A．Our everyday life is always full of surprises.
B．Most customers enjoy being treated this way.
C．Being different is a good way of doing business.
D．A little positive action can make a big difference.
2Q (g) + nR (g)，达到平衡后，容器内温度不变，混合气体的压强比原来增加5%，X的浓度减小1/3，则该反应方程式中的n值（ ）
2Q (g) + nR (g) △n↓