首页
登录
职称英语
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
游客
2023-11-12
65
管理
问题
After going over some basic about hearing, the teacher will lead the students to [br]
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、excessive noise
B、too much moderate noise for a long time
C、intense noise for even a short time
D、moderate noise for a short time
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3181727.html
相关试题推荐
Nowadays,mostcollegesanduniversitiesencouragestudentsto[br][originalte
Nowadays,mostcollegesanduniversitiesencouragestudentsto[originaltext]
Ofthefourgroupsofstudents,whoscoredthelowestinmathsaccordingtothe
Ofthefourgroupsofstudents,whoscoredthelowestinmathsaccordingtothe
Tomysurprise,themajorityofthestudents_____infavorofhisproposal.A、isB
Thestudentsexpectedthere______morereviewingclassesbeforethefinalexams.A
Theairlineschargehalf-priceforthestudents._____,I’vealreadyboughtmyti
Itwasunusualforthere______sofewstudentsintheclassroom.A、tobeB、beC、
Allhisteachers______hissuccesstohisdiligenceandperseverance.A、oweB、re
Thetuitionfeesare______tostudentscomingfromlow-incomefamilies.A、approac
随机试题
Marriedpeoplelive"happilyeverafter"infairytales,buttheydosoless
膀胱肿瘤的临床表现包括()。A.多数表现为无痛肉眼血尿 B.血尿的严重程度和
某政府部门需要改造现有信息系统,目前正在开展项目立项工作。该项目经初步设计和投资
工程量清单特征描述主要说明( )。A.措施项目的质量安全要求 B.确定综合单
下列属于青少年的膳食指南内容的是( )。A.多吃谷类,供给充足的能量 B
内麦粒肿是()的病变。A.汗腺 B.睑板腺 C.Zeis腺 D.Moll
根据《中华人民共和国公司法》的规定,公司财产在分别支付( ),缴纳所欠税款,清
下列方法中,属于定性市场预测方法的有()。A.集合意见法 B.对比类推法
我国的金融租赁公司以经营( )业务为主。A.经营租赁 B.转租赁 C.房屋
胎心律或钟摆律提示A.心肌严重受损 B.第三度房室传导阻滞 C.室性心动过速
最新回复
(
0
)