Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. What’s NOT the true statement about an audio tour
A．Information on all works is accessible on cell phone provided by the museum. B．Radio tours have been part of the National Gallery since the 1960s. C．The digital technology gives visitors more freedom. D．The visitors can borrow an mp3 player at no cost.