Questions 17-20 are based on comments on job interviews. You now have 20 seconds to read Questions 17-20. What is the main idea of the short monologue you have just heard
A．A job seeker should create a good image during an interview. B．Self-confidence is the most important for a job seeker. C．Finding a job is more difficult than one can imagine. D．Professional knowledge is a decisive factor in job interview.