题型:阅读选择 题类: 难易度:普通
浙江省杭州市滨江区2024年中考英语一模试卷
Headphones are helpful. They are good for blocking out noise. And we use them to listen to music no influencing others. But headphones can be harmful, too. They can cause hearing loss if the volume (音量) is too loud. Studies show that one out of every 10 kids in the United States has some hearing loss. The cause is loud noise.
How Hearing Works
An ear has many working parts. Their job is to tum sound into something your brain can understand. And there are cells (细胞) inside the car that help you hear. "We call them hair cells," Jackie Clark says. "They look like hairs standing up." Clark is a professor at the University of Texas, She studies how loud noises affect (影响) our ears.
Sound moves and makes the hair cells move back and forth. Loud noises can damage (损害) these cells by getting them not straight anymore. Once the cells arc damaged, they don't grow back.
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One sign of hearing loss is tinnitus. It's a ringing in the cars. "It's like someone is playing the violin for a long time," Clark says. "It's difficult to get away from it." And the damage affects more than your ears. It can cause worries and stress.
How can you protect your ears? Keep the volume on your headphones low. You should be able to hear sounds around you. And other people shouldn't hear noise from your headphones.
Measuring(测量) Sound
Sounds or noises are everywhere. Raindrops are 40 decibels (分贝) while fireworks are 140 decibels. What about your headphones? They can go higher than 100 decibels. That's too loud. To protect your ears, keep your headphones at about half volume. And don't listen too long. About an hour a day is safe.
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