________,ourearsareaccustomedto

发布时间：2020-07-28 01:22:50

________, our ears are accustomed to sounds between 40 to 50 decibels．But in the settings like a KTV, the volume usually goes up to 80 to 90 decibels, which can cause damage to the ears．A.RegularlyB.FortunatelyC.FrequentlyD.Normally

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D
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