听一段材料，回答下面几个小题。
What is the main purpose of this talk?
A. To advertise a computer learning school.
B. To explain the importance of the computer.
C. To describe how to program computers.
What do we know about most of the listeners?
A. They are out of work.
B. They are doctors and lawyers.
C. They are not satisfied with their present jobs.
What is one of the advantages of computer programmers?
A. They can win people's respect.
B. They can work in good condition.
C. They can receive fine training.
What is the most attractive to the listeners?
A. Offering job opportunities.
B. Training them at night.
C. Protecting their belongings.