Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions. Now listen to the interview. If after vigorous exercise, a person’s pulse rate remains high for a long while, he or she ______.
A．has an unusually strong heart B．must be suffering from some disease C．should go to the hospital to have a check-up D．needs to reduce the intensity of the exercise