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
63
管理
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:http://tihaiku.com/zcyy/3181726.html
相关试题推荐
Asteachersweshouldconcernourselveswithwhatissaid,notwhatwethink___
Weather______,thestudentsofClassTwowillhaveapicnicthisSunday.A、permit
Accordingtothegirl,herEnglishteacheris[br][originaltext]Girl:Dad,can
InAmericancityschools,howmanystudentsareabsentonadallybasis?[br][
InAmericancityschools,howmanystudentsareabsentonadallybasis?[br][
InAmericancityschools,howmanystudentsareabsentonadallybasis?[br][
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
随机试题
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,but
[originaltext]M:Well,haveyougotanythingtodeclare?Isthatthecaseyou’v
Marriagemayimproveyoursleep,andbettersleepmayimproveyourmarriage,
LegendhasitthatsometimetowardtheendoftheCivilWar(1861—1865)agove
Handwritinghasbecomeadyingart,nowthatkidsstartusingkeyboardsass
请回答下关的主治,叙述并演示至阴、下关的定位及至阴的操作。(10分)
如下图所示,长度均为六分之五千米的三个圆形跑道汇聚于点O,若甲、乙、丙三人分别以
李老师针对已有教学方法的不足,提出了较为完善的情景教学方法,并取得了一定的成效。
一般认为证券市场是有效市场的机构投资者倾向于选择()。 A.收入型证券组合B
燃气管道附属设备应包括()。A.阀门 B.放散管 C.补偿器 D.疏
最新回复
(
0
)