首页
登录
职称英语
[originaltext] I am glad to see so many of you here. We’ve become really ala
[originaltext] I am glad to see so many of you here. We’ve become really ala
游客
2024-02-27
25
管理
问题
I am glad to see so many of you here. We’ve become really alarmed over at the health center by the number of students we are seeing, who are experiencing heating loss. First I want to go over some basics about hearing, then we can take a look at our school environment and see if we can figure out some ways to protect hearing. The leading cause of preventable heating 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 hear. Sounds up to 80 decibels generally aren’t harmful, that’s noise like traffic on a busy street. But anything louder than 80 decibels, esp. with continuous exposure, may eventually hurt your hearing. Once you’re 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 is 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 hand-out, 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 fight behind you. Now, let’ s try to generate a list of damaging noises.
选项
A、The traffic next to campus.
B、Horns at football games.
C、Low-fiying airplanes.
D、Loud equipment at the health center.
答案
B
解析
细节题。关键句是They(指those horns)are really dangerous if blown right behind you.如果在你身后突然响起来,这些号角声是(使听力受损的)真正的危险。
转载请注明原文地址:https://tihaiku.com/zcyy/3487847.html
相关试题推荐
[originaltext]Lastweekwediscussedtheproblemofrisingprices,or,int
[originaltext]Lastweekwediscussedtheproblemofrisingprices,or,int
[originaltext]M:Vicky!Haveyouheardthenews?W:No,Sam.Whatdoyoumean?
[originaltext]Howmanymendohousework?RecentlyaEuropeancommissiontri
[originaltext]Howmanymendohousework?RecentlyaEuropeancommissiontri
[originaltext]Howmanymendohousework?RecentlyaEuropeancommissiontri
[originaltext]M:Goodmorning,Mary.Howareyou?W:Oh,fine.I’mjustonmyw
[originaltext]M:Goodmorning,Mary.Howareyou?W:Oh,fine.I’mjustonmyw
[originaltext]M:Goodmorning,Mary.Howareyou?W:Oh,fine.I’mjustonmyw
[originaltext]M:Goodmorning,Mary.Howareyou?W:Oh,fine.I’mjustonmyw
随机试题
Herearesomesymbolcodesforfourwords.MatchtherightcodetothewordWARY
America’sFavoriteFoodsYoumayhaveheardthatAme
用摆式仪测试路面抗滑性能时,同一处平行测定的次数要求为()。A.不少于3次
检定具有法制性,属于计量管理范畴的执法行为。
A.肿瘤细胞减灭术,辅以化疗 B.肿瘤细胞减灭术,辅以放疗 C.肿瘤细胞减灭
男性,28岁,2周前右脚受伤划破皮肤,未予注意。3天前高热、皮肤淤点就诊。血压8
甲公司从银行取得贷款30万元,年利率为6%,贷款期限为3年,到第3年年末一次偿清
患者女性,37岁。孕2产0,孕40周。因羊水Ⅱ度粪染,行产钳助娩术,新生儿出生1
66、起重钢丝绳用卡子连接时,根据钢丝绳直径不同,使用不同数量的卡子,但最少不得
关于可编程控制器PLC的I/O接口模块,下列描述哪一项是错误的?()A.I/O
最新回复
(
0
)