首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
What is this passage talking about?
What is this passage talking about?
admin
2010-05-25
25
问题
What is this passage talking about?
We’ve become really alarmed over the health center by the number of students we are seeing, who are experiencing hearing 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 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 hear. Sounds up to 8O decibels generally aren’t harmful. That’s noise like traffic on a busy street. But any- thing louder than 80 decibels may eventually hurt your hearing. Once sounds are up to around 140 decibels, that’s like a jet plane taking off, then you might 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、Air pollution.
B、Noise damage.
C、Environment in campus.
D、Solutions for pollution.
答案
B
解析
转载请注明原文地址:https://jikaoti.com/ti/vXqMFFFM
0
专业英语四级
相关试题推荐
Peopletendtocomplainalotaboutthe______risingpricesrecently.
Americaisthelandoftheautomobile.Thiscountryhasonly6percentoftheworld’spopulationbut46percentoftheworld’sc
Americaisthelandoftheautomobile.Thiscountryhasonly6percentoftheworld’spopulationbut46percentoftheworld’sc
WriteonANSWERSHEETTWOanoteofabout50~60wordsbasedonthefollowingsituation:YouareNick.Youhadpromisedtog
Theman’sefforttofindapositiondoesnotinclude_____.
Whatdoestheauthorofthispassagebelieveistherealcauseofgangenrollment?
TheBuckinghamPalaceistheplace______almostalltouristscannotaffordtomisswheninLondon.
Itwasthevery______invention,andhadjustarrivedfromtheUnitedStates.
Theevolutionofsexratiohasproduced,inmostplantsandanimalswithseparatesexes,approximatelyequalnumbersofmalesan
Whatisthenationalityoftheresearchers?
随机试题
下列叙述中正确的是( )。
关于管电压、管电流的叙述,正确的是
在投资项目经济评价中进行敏感性分析时,如果要分析投资大小对方案资金回收能力的影响,可选用的分析指标是( )。
下列财政支付活动中,属于购买性支出的是()。
班级成员在认识上、行动上保持高度一致,相互之间形成一定的依存性,而增强班级的凝聚力,推动班级的发展,是指班集体的基本特征应该具有()。
右图为植物体细胞杂交过程示意图。据图回答: 步骤②一般常用的化学试剂是______,诱导原生质融合。
教唆他人实施犯罪行为的,均构成共同犯罪。()
恩格斯在《共产主义信条草案》中明确提出,“财产公有”制度不是任何时候都可以实现的,它必须建立在因发展工业、农业、贸易等而产生的大量的生产力和生活资料的基础之上,建立在因使用机器、化学方法和其他辅助手段而使生产力和生产资料无限增长的可能性的基础之上。这表明,
设三元二次型f=xTAx的二次型矩阵A的特征值为λ1=λ2=1,λ3=-1,ξ3=(0,1,1)T为对应于λ3=-1的特征向量。若3维非零列向量α与ξ3正交,证明α是对应于λ1=λ2=1的特征向量。
A—employeeB—salesdepartmentC—payrollD—white-collarworkerE—blue-collarworker
最新回复
(
0
)