【听力答案】

7. A 8. D 9. C 10. B

【听力原文】

Passage 3

I'm glad to see so many of you here. We've become really alarmed over the health center by the number of students we are seeing, who are experiencing hearing loss.（7）First, I want to; go over some basic about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing,（老师在介绍关于听力的基础知识后，会带领同学们测量校园内的噪音并找出解决方案来保护听觉，因此可总结为将学到的理论付诸实践。）（8）The leading cause of preventable hearing loss is excessive noise. Too much moderate noise for a long time or some types of intense noise for even a short time can damage hearing.（过多的嗓音会造成听力丧失，过长时间暴露在中等噪音或短时间暴露在剧烈噪音中，都会带来听力损伤。文中并未涉及短时间暴露在中等噪音中的情况。）Loudness is measured in units called decibels. One decibel is the lowest sound that the average person can here.（9）Sounds up to 80 decibels generally aren't harmful.（80分贝以下的声音不会对听觉造成伤害。）That's noise like traffic on a busy street.But anything louder than 80 decibels, especially with; continuous exposure, may eventually hurt your hearing. （10）Once you are up to around 140 decibels, that's like a jet plane taking off, then you might even feel pain in your ears.（暴露在140分贝的噪音环境中，你会感觉耳朵疼痛；但并不至于失聪或晕倒。）And pains are sure sign that your hearing's at risk. Even one exposure to a really loud noise at close range can cause hearing loss. So what you need to do is limit your exposure to harmful levels. If you pass along this handout，we can take a look at the decibel level of some common campus sounds. Notice how loud those horns are that people take to football games. They are really dangerous if blown right behind you. Now, let's try to generate a list of damaging noises.

【核心词汇】

decibel n.分贝

excessive a.过分的；过多的

exposure n.暴露

intense a.剧烈的；紧张的

moderate a.适度的，中等的

hearing loss 失聪