单项选择题

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.

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