One Sunday morning, I decided to buy a computer to use for school. I went to the biggest store in town, which sold all kinds of computers. There were so many computers there that I didn’t know how to choose a right one.
“Hi! What can I do for you?” A young man greeted me with a sweet smile. He looked like not a salesman but a student like me. I sensed a strange feeling—as if I had met him before. He began patiently showing  me each model. With his help, I decided to buy one computer with enough functions at a very low price. I enjoyed this shopping experience because of his smile. A few months later, something was wrong with my computer. I went back to the store to have it fixed. When I arrived there, what I saw first was still his smile. As soon as I told him my problem, he comforted me immediately and tried his best to solve the problem for me. I was quite grateful to him for his sweet smile and good service.
When I went back to school, his smile often appeared in my mind. I don’t know whether we’ll meet each other again, but his sweet smile will stay there in my memory and deep in my heart. Smiling is the most peaceful language in the daily life.
After reading the story, we can know that the writer is a _________.

A．student

B．salesman

C．doctor

D．reporter

According to the passage, why was the writer grateful to this salesman?

A．Because the salesman recommended the cheapest computer.

B．Because the salesman gave the writer his sweet smile and good service.

C．Because the salesman recommended the computer with enough functions.

D．Because the salesman showed the writer how to use the computer correctly.

What does the writer mainly want to tell us in the story?

A．The way to choose a right computer.

B．The way to use a computer correctly.

C．The importance of smiling in the daily life.

D．The importance of computers in the daily life.