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.
Now listen to the passage.
Which of the following is NOT true according to the passage

A．You need to pay attention to the date of publication of travel books.
B．You should make sure that the contents of travel books are well presented and easy to find.
C．The best travel books are those describing everything as "marvelous", "fabulous" or "magical".
D．You need to be careful in choosing proper travel books.