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 (听力丧失) ,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 (分贝) 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 bon with about 16,000 hair cells (听毛细胞) 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 alight 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 (相当于) the noise of a subway.
Here is some advice on safe listening. Over-the-ear headphones  (头戴式耳机) 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.
根据短文内容，判断下列句子正误。正确的用“A”表示，不正确的用“B”表示。
16. It is safe to listen to sounds that are louder than 100 dB for 15 minutes
17. Listening to loud noise for a long time can cause some hair cells in the inner ear to die.
18. From the fourth paragraph, we know people don't always realize how loud their music is.
19. In-ear headphones are better than over-the-eat ones because they can stop more outside noise.
20. This article mainly tells us why ears are an important part of our bodies.
【答案与解析】
【文章大意】本文主要讲述了长时间听大音量的音乐会对我们的听力造成伤害。
16. B    【解析】根据第一段t is not safe to listen to sounds that are louder than 85 dB (分贝) for eight hours or 100 dB for 15 minutes. 听8小时大于85分贝（分贝）或15分钟大于100分贝的声音是不安全的。所以此句和原文是矛盾的，故用B表示。
17. A    【解析】根据第二段However, listening to loud noise for a long time can make these cells work too hard and cause some of them to die. 然而，长时间听大噪音会使这些细胞工作得太辛苦，导致其中一些细胞死亡。所以此句和原文是一致的，故用A表示。
18. A    【解析】根据第四段For example, if you are in a noisy place like the subway, you might turn up your music too loud without realizing it. 比如当你在地铁的时候，你可能会把你的音乐调得太大而没有意识到。所以当人们在比较嘈杂的环境时，可能不能意识到音乐的声音有多大，故此题说法和原文一致，故用A表示。
19. B    【解析】根据原文Over-the-ear headphones (头戴式耳机) are better than in-ear ones. They do a better job of stopping outside noise,可知头戴式耳麦比耳麦好，它们在阻止外界噪音方面做得更好。故此句说法和原文是相反的，故用B表示。
20. B    【解析】通过阅读全文可知，本文主要讲了长时间听大音量的音乐会对听力造成伤害，而并没有讲为什么耳朵是我们身体的重要组成部分，此选项错误，故用B表示。