I once knew an old man whose bad memory made him famous. John Smith was so forgetful that

he sometimes forgot what he was talking about in the middle of a sentence. His wife had to constantly remind him about his meetings, his classes — even his meals. Once he forgot he ate breakfast twice, at home and at school. His wife liked to remind her neighbours, "If John didn't have his head tied on, he would forget that too!"

Since Smith was a professor at a well known university, his forgetfulness was often an embarrassment. It wasn't that he was not claver, as some critical people tended to say, last very, very absentminded. One hot summer day, Professor Smith decided to take his children to a seaside town about a three-hour train ride away. To make the trip more interesting for his young children, he kept the name of the town a secret. However, by the time they arrived at the station, Smith forgot the name of the town he was planning to visit. Luckily, a friend of his happened to be in the station. He offered to take care of the children while Smith hurried back home to find out where he was going.

The professor's wife was surprised to see him again so soon.

"Oh, my dear, I forgot the name of the town. " "What？ You forgot the name？ Maybe one day you will forget my name ! Now I'll write the name of that town on a piece of paper, and you put it in your pocket and please, please don't forget where you put it."

Satisfied that she had solved the problem, she sent her husband off again. Ten minutes later she was astonished to see him outside the house for the third time. "What is the matter now？ " "As you told me, I didn’t forget where I put the name of that town, but I forgot where I left our children!"

This passage is mainly ______.

A．a careless professor

B．a famous professor

C．a foolish professor

D．a forgetful professor