奇速英语

Headphones (耳机) are helpful. We use ____1____ to listen to music without disturbing others. Many kids use them in school. But headphones can be h____2____, too. They can cause hearing loss if the volume is too loud. Studies show that one out of every 10 kids in the United States has some hearing ____3____. The cause is loud noise.

There are cells inside the ear that help you hear. They can only be seen with a microscope (显微镜). “We call them hair cells,” Professor Jackie Clark said. “They look like hairs standing up.”

Sound ____4____ be seen. But it moves in waves. It makes the hair cells move back and forth. Think of the wind in the leaves. Loud ____5____ can damage these cells. The cells scrape (刮蹭) against the ear. This gets them twisted and bent. And once the cells are d____6____, they don’t grow back.

One sign of hearing loss is tinnitus (耳鸣). It’s ____7____ ringing in the ears. “It’s like someone is playing a note on the flute (长笛) for a long time,” Clark says. “There’s no getting rid of it.” And the damage affects ____8____ than your ears. It can cause worries and stress.

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