首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
After going over some basic about hearing, the teacher will lead the students to
After going over some basic about hearing, the teacher will lead the students to
admin
2013-07-09
34
问题
After going over some basic about hearing, the teacher will lead the students to
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. (17)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. (18)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. Loudness is measured in units called decibels. One decibel is the lowest sound that the average person can here. (19)Sounds up to 80 decibels generally aren’t harmful. That’s noise like traffic on a busy street. But anything louder than 80 decibels, especially with continuous exposure, may eventually hurt your hearing. (20)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. And pain is a 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.
选项
A、put the theory learned into practice
B、finish and check their homework
C、solve some academic problems
D、cure people who are experiencing hearing loss
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/HZQK777K
0
专业英语四级
相关试题推荐
Onbehalfofthehospitalizedpatients’families,themayorexpressedhisappreciationofthemedicaldoctors’commitment______p
Hiscar______atreebutfortunatelyhewassafe.
CollegesportsintheUnitedStatesareahugedeal.AlmostallmajorAmericanuniversitieshavefootball,baseball,basketball
MediaViolenceViolenceinthemediaiseasilyaccessibletochildren./Researchshowsthatthereisincreasinginstanceso
Accordingtotheacoustics,continualexposure______noiseofhighintensitywouldleadtolossofhearing.
Asweallknow,sleepdeprivationcanleadtoexhaustion-fueledmistakesintheworkplace,whethertheybeasimpletypoinaqu
Asweallknow,sleepdeprivationcanleadtoexhaustion-fueledmistakesintheworkplace,whethertheybeasimpletypoinaqu
Ofthefourgroupsofstudents,whoscoredthelowestinmathsaccordingtothesurvey?
Astheconversationbegins,whatarethemanandthewomandoing?
WhereistheWestPointlocated?
随机试题
人民军队的称谓先后经历了几次较大变动,根据称谓使用的时间顺序排列正确的一组是()。①国民革命军第八路军②工农革命军③中国人民解放军④国民革命军陆军新编第四军⑤红军⑥土地革命军
痹证的治法有()(2008年第162题)
男,45岁,急性胰腺炎,静脉应用广谱抗生素非手术治疗1周后,腹痛、腹胀加重,体温再度升高。此时应紧急选择最有诊断意义的检查是
重度脱水患儿,需扩容时首批液体选择为
半年度中期财务会计报告应当于年度中期结束后()内对外提供。
评估人员对甲企业进行整体评估,通过对该企业历史经营状况的分析及国内外市场的调查了解,收集到下列数据资料:(1)预计该企业第1年的收益额为500万元,以后每年的收益额比上年增长16%,自第6年企业将进入稳定发展时期,收益额将保持在600万元的水平上;(2
学生在课堂上向你提出一个意想不到又很有价值的问题,你不能马上做出正确的解答。这时,正确的做法是()。
如果儿童出现口吃,开始发展的年龄一般是()
下列各书中,不属于类书的是()。
在漫长的历史岁月中,中国主体一直是一个统一的多民族国家,虽有分合离乱,但统一的时期远远多于分裂的时期,其根本原因就在于()
最新回复
(
0
)