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
2023-11-10
55
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. (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. (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. 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. 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. 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.
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/3173507.html
相关试题推荐
TheStudents’Unionofyouruniversityisplanningtoholdanartsfestivaln
As______clearfromhismanners,heisateacher.A、beingB、isC、tobeD、beenB关系分
Studentsinthisuniversityareforbidden______outofthemaingatesoftheun
Theteacherdidn’tknowwho______forthebrokenglass.A、blamedB、wouldblameC
Ibecameateacherunderbizarrecircumstances,butinretrospectitwasone
Ibecameateacherunderbizarrecircumstances,butinretrospectitwasone
Ibecameateacherunderbizarrecircumstances,butinretrospectitwasone
Highschoolandcollegestudentstodayarepushedsomuchinthedirectionofsp
Recentsurveysshowthatalotofcollegestudentsdownloadpapersfromthe
Mostofus,asstudents,arecarefulwithourmoneyindailylife:wecollec
随机试题
Directlendingriskoccursinproductsrangingfromloansandoverdraftstocred
Oneofthemostinterestingofallstudiesisthestudyofwordsandwordor
Domesticviolenceisaseriouscrimecausingserioussocialproblems.Itis
C
使用固定式直梯进行攀登作业时,超过( )时必须设置梯间平台。A.3m B.5m
患者咳嗽,痰稠色黄,不易咳出,大便秘结,舌红苔黄,脉滑数。治疗应首选A.半夏
有人认为请客吃饭只有剩下多才显大方、有面子、才算入流,这导致了较为普遍的餐桌浪费
()是指金融市场参与者无法以合理成本及时获得充足资金,以偿付到期债务、履行其
下列各句子中没有语病的一句是: A人们如果连续看上四五个小时的电视节目,就
(2016年真题)纳税人采取以旧换新方式销售金银首饰,应按照其实际收取的不含增值
最新回复
(
0
)