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

　　C　[细节理解题。根据第二段可知，这个收银员不仅扫描货物，还和顾客进行交流，这才使得作者这一排进行得很慢。]

　　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

　　A　[推理判断题。根据第二段倒数第二句可知，他的话是惯例，但是他做了不同的事情--他实际上在听别人说话。由此可推断出，平常说这话的人并不在意你的回答是什么。]

　　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.

　　B　[细节理解题。根据倒数第三段中的There were smiles and some sheepish grins.All had been touched by his simple gesture...可知选B。]

　　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.