听下面一段较长对话，回答以下小题。
【小题1】What is the man?

A．A doctor.

B．A host.

C．A teacher.

【小题2】Who used to be a doctor?

A．Cassie’s friend

B．Cassie’s mother.

C．Cassie’s friend’s mother.

【小题3】How long did it take Cassie to become a qualified doctor?

A．One year.

B．Four years.

C．Five years.

【小题4】What does Cassie say about her job?

A．She gets bored with it.

B．She enjoys it in general.

C．She always works overtime.