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
2024-10-11
36
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:https://tihaiku.com/zcyy/3796291.html
相关试题推荐
Shehasaterriblyhottemper,but______sheisreallykindtoherstudents.A、on
Theteacher’svoicewassopleasantthatthelittleboyfeltat______withhera
Therearenotmanyteacherswhoarestrong______oftraditionalmethodsinEnglis
Youwanttotellme,andIhavenoobjection______it.A、tohearB、tohearingC、he
Nowadays,mostcollegesanduniversitiesencouragestudentsto[br][originalte
Nowadays,mostcollegesanduniversitiesencouragestudentsto[br][originalte
Ofthefourgroupsofstudents,whoscoredthelowestinmathsaccordingtothe
Ihopemyteacherwilltakemyrecentillnessinto_____whenjudgingmyexaminati
Tomysurprise,themajorityofthestudents_____infavorofhisproposal.A、isB
Weinsistthatstudentsshouldgiveatruthfulanswer______withtherealityoft
随机试题
Whenmostpeoplethinkaboutchangingtheirbodyshape,theyusuallyfocuson
空调机房的高度一般在( )。A.3~4m B.4~5m C.4~6m D
B
对于严寒地区,常见的保温构造方法是在距离外墙周边()m的范围内设置保温层。
患儿,男性,7岁,近一年来,经常从睡眠中惊醒,伴随极度的恐惧和焦虑,无尖叫及哭吵
与现券交易相比,远期交易的特点主要表现在以下()方面。 ①远期交易买卖双
初步鉴别肠杆菌种致病菌及非致病菌的试验是A.葡萄糖发酵试验B.吲哚试验C.甲基红
某单位去年党员人数比入党积极分子人数多4倍,男性党员和入党积极分子均比女性多。今
烤瓷熔附金属全冠边缘为烤瓷者,牙体颈缘应预备成A.羽状 B.凹槽状 C.直角
下列不属于H.S编码设立品目依据的是()。 A.产品的用途B.产品的基本
最新回复
(
0
)