Do you often listen to music at loud volumes （音量）？You should know that this habit is bad for your hearing.Over 1 billion young people are at risk of hearing loss because of listening to loud noise for long periods of time.Listening to music or watching a TV show at loud volumes can harm your hearing.
   The United Nations has standards for safe listening.It is not safe to listen to sounds that are louder than 85 dB （分貝） for eight hours or 100 dB for 15 minutes.The sound of a busy road is about 85 dB and the sound of a rock concert can be about 100 dB.
   Loud noise is harmful to the inner ear.Most of us are born with about 16，000 hair cells （聽(tīng)毛細(xì)胞） in our inner ears.These cells notice sounds.However，listening to loud noise for a long time can make these cells work too hard and cause some of them to die.This is what causes hearing loss.Once this happens，it's hard to get your hearing back.Some people might think that their music isn't all that loud.But this can depend on where you are.For example，if you are in a noisy place like the subway，you might turn up your music too loud without realizing it.Later，when you listen to it at the same volume in a quiet place，you might feel uncomfortable.
   The "safe level" for most sound is below 80 dB for up to 40 hours a week.A level of 80 dB is about equal to （相當(dāng)于） the noise of a subway.
   Here is some advice on safe listening.Over-the-ear headphones are better than in-ear ones.They do a better job of stopping outside noise，so you can listen at a lower volume.
   Don't listen to loud music on your headphones for a long time.Follow the 60：60 rule：listen to music at 60 percent of your headphones' maximum volume for no more than 60 minutes a day.

判斷正（A）誤（B）。
（1）It is safe to listen to sounds that are louder than 100 dB for 15 minutes．

B

B

（2）Listening to loud noise for a long time can cause some hair cells in the inner ear to die．

A

A

（3）From the fourth paragraph，we know people don't always realize how loud their music is．

A

A

（4）In-ear headphones are better than over-the-ear ones because they can stop more outside noise．

B

B

（5）This article mainly tells us why ears are an important part of our bodies．

B

B