单项选择题

At the level of 115 decibels, permanent hearing damage can occur after just ______.
A) 15 minutes C) 100 minutes
B) 60 minutes D) 105 minutes

A．At the level of 115 decibels, permanent hearing damage can occur after just ______.
B．15 minutes
C．60 minutes
D．100 minutes
E．105 minutes

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