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.
It can be inferred from the passage that
A.some radio broadcasting stations use hotlines for advertisements. B.it is not a good idea for some radio broadcasting stations to use hotlines. C.some people use hotlines in a wrong way. D.some people have unclear thoughts.