《2025年通城学典课时作业本九年级英语上册译林版江苏专版》

A
Do you often listen to music at loud volume(音量)? Over one billion(十亿) young people are at risk of the hearing loss(失聪) because of listening to loud noise for long periods of time.
Listening to music or watching a TV show at loud volume is harmful to your hearing.
It is not safe to listen to sounds that are louder than 85 decibels(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 ears(内耳). Most of us have a large number of hair cells(毛细胞) in our ears. 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 the hearing loss.
Some people might think that their music isn’t 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 World Health Organization said the “safe level” for most sounds is below 80 dB for up to 40 hours a week. A level of 80 dB is roughly(大约) equal to(相当于) the noise of a subway.
( )1. Many young people are at risk of the hearing loss because they .
A. watch TV every day B. listen to music every day
C. listen to loud noise in the subway D. listen to loud noise for a long time
( )2. The sound level of a rock concert is about .
A. 80 dB B. 85 dB C. 100 dB D. 110 dB
( )3. What is loud noise harmful to?
A. The inner ears. B. The brain. C. The heart. D. The eyes.
( )4. What can you learn from the passage?
A. We feel comfortable when listening to loud music in a quiet place.
B. Listening to loud noise can make the hair cells work easily.
C. It is not safe to listen to sounds that are louder than 85 dB for 15 minutes.
D. The “safe level” for most sounds is below 80 dB for up to 40 hours a week.
( )5. What is the best title for the passage?
A. Keep the loud volume B. Loud noise is harmful to hearing
C. The risk of listening to music D. Loud noise stops ears from working

答案： 1~5. DCADB