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.
What is Miss Barnes’ job

A．by inputting the exact address
B．by indicating the location of his car
C．by checking his computer database
D．by giving vocal orders to the computer

A．the immaturity of the new technology
B．the superiority of the global positioning system
C．the cause of price fluctuations in car equipment
D．the different ways of providing guidance to the driver