Questions 17 to 20 are based.on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following is NOT true, according to the passage you have just heard

A．The author asserts that bank-issued credit cards can be automatically used.
B．The author asserts that the United States of America is already a cashless society.
C．The author believes that nowadays many available banking services ar conveniences.
D．The author assumes that manufacturers, processors and suppliers all rely on computer.