阅读理解

　　Mr. Smith worked in an office, and he did a lot of important and difficult work. But when he was fifty he started to forget things, and this made his work difficult. One day he said to himself,“I'm going to see Dr. Black about this.”

　　He waited in the doctor's waiting-room with other patients, and then a nurse said to him, “You can go in and see Dr. Black now.”

　　Mr. Smith went in quickly, and the doctor said, “Please sit down, Mr. Smith. What can I do for you?”“Oh, doctor,” said Mr. Smith. “I can't remember anything longer than half a minute, and this made my work very hard. What can I do?” The doctor said,“When did this start, Mr. Smith?”

　　“When did what start?” Mr. Smith asked.

(1)Mr. Smith found it hard to remember things ________.

[　　]

A．fifty years ago

B．when he worked in an office

C．when he was fifty years old

D．when he was young

(2)Mr. Smith decided to see a doctor because ________.

[　　]

A．his work was difficult

B．he began to forget things

C．the doctor was his son

D．his right leg hurt

(3)Who told Mr. Smith to go in and see Dr. Black?

[　　]

(4)The doctor asked Mr. Smith ________.

[　　]

A．how old he was

B．what he was

C．where he lived

D．what was wrong with him

(5)Mr. Smith ________.

[　　]

A．didn't see a doctor

B．was hard to visit

C．could remember things for more than one minute

D．forgot what he had told Dr. Black