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单项选择题

Questions 14 to 16 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.

What kind of sounds is harmful for your hearing
A．Traffic on a busy street.
B．Jet plane taking off.
C．Sound that the average person can hear.
D．Sounds up to 80 decibels.
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