Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. The man is speaking with ______

A．people should be able to respond quickly to the advancement of technology
B．future achievements in technology will bring about inconceivable dramatic changes
C．the importance of high technology has been overlooked
D．computer science will play a leading role in the future information services

A．the difference between the employee and the employer has become insignificant
B．people' s traditional concepts about work no longer hold true
C．most people have to take part-lime jobs
D．people have to change their jobs from time to time