47 (A)One possible method is through devices that flash amber once the noise approaches a set level. (B)Who knows how many people are similarly avoiding clubs and bars because they are fed up with yelling at each other to be heard? (C)At noise levels exceeding 90 decibels, even the best construction cannot keep the sound of pounding bass inside. (D)Who knows how many people are similarly avoiding these places because they are fed up with waking up with reeking clothes?