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
Although many of us may feel air-conditioners bring relief from hot, humid or polluted outside air, they pose many potential hea
Although many of us may feel air-conditioners bring relief from hot, humid or polluted outside air, they pose many potential hea
admin
2017-11-17
51
问题
Although many of us may feel air-conditioners bring relief from hot, humid or polluted outside air, they pose many potential health hazards. Much research has looked at how the movement of air inside a closed environment—such as an office building—can spread disease or expose people in the building to harmful chemicals.
One of the more widely publicized dangers is that of Legionnaire’s disease, which was first recognized in the 1970s. This was found to have affected people in buildings with air-conditioning systems in which warm air pumped out of the system’s cooling towers was somehow sucked back into the air intake (通风口), in most cases due to poor design. The warm air, filled with bacteria, was combined with cooled, conditioned air and was then circulated around various parts of the building. Studies showed that even people outside such buildings were at risk if they walked past air exhaust pipes.
Large air-conditioning systems add water to the air they circulate by means of humidifiers (湿度调节器 ). In older systems, the water used for this process is kept in special reservoirs, the bottoms of which provide breeding grounds for bacteria which can find their way into the ventilation (通风) system. The risk to human health from this situation has been highlighted by the fact that the immune systems (免疫系统) of approximately half of workers in air-conditioned office buildings have developed the ability to fight off the organisms found at the bottom of system reservoirs. But chemicals called "biocides" are added to reservoirs to make them germ-free, and they are dangerous in their own right in sufficient quantities, as they often contain compounds strongly linked to cancers.
Finally, it should be pointed out that the artificial climatic environment created by air-conditioners can also affect us. In a natural environment, whether indoor or outdoor, there are small variations in temperature and humidity. Indeed, the human body has long been accustomed to these normal changes. In an air-conditioned living or work environment, however, body temperatures remain well under 37℃, our normal temperature. This leads to a weakened immune system and thus greater exposure to diseases such as colds and flu.
The last paragraph implies that our immune system can be weakened when______.
选项
A、we live in an artificial climatic environment
B、there are variations in temperature and humidity
C、our body temperatures often remain not high enough
D、we are often exposed to diseases such as colds and flu
答案
C
解析
推理判断题。本题考查代词的理解。解题的关键在于理解最后一句中的This是指上一句所说的情况。选项A中所说的人造环境不是使免疫系统变弱的必然条件。选项B是保持免疫系统健康的条件。选项D是免疫系统变弱后的影响。
转载请注明原文地址:https://kaotiyun.com/show/RLa7777K
0
大学英语四级
相关试题推荐
A、Transmithappyfeelingstoothers.B、Reachouttopeoplewhoneedhelp.C、Paymoreattentiontolonelypeople.D、Interactwith
Howdidtheearlypeopledotheircounting?Atfirst,theydidalltheircountingwithsmallstones.Later,theylearnedtouse
Womenareonthevergeofoutnumberingmenintheworkforceforthefirsttime,ahistoricreversalcausedbylong-termchanges
Pub-talkA)Pub-talk,themostpopularactivityinallpubs,isanativedialectwithitsowndistinctivegrammar.Thereare
AstrologyA)Astrologyisthestudyofhowthesun,themoon,planets,andstarsaresupposedlyrelatedtolifeandeventso
TipsforThoseWhoTravelAloneA)Whenitcomestotraveling,sometimestakingajourneyalonecanbegreat.Travelingalon
It’sveryinterestingtonotewherethedebateaboutdiversity(多样化)istakingplace.Itistakingplaceprimarilyinpolitical
Politicsisanemotionalbusiness.Still,manypeoplefoundthemselvesunusuallymovedbythehistoricpresidentialinauguration
A、Listentosomequietmusic.B、Getoutofbedtillbeingsleepyagain.C、Trytorelaxourmind.D、Readsomeinterestingarticle
BigisBackA)Corporategiantswereonthedefensivefordecades.Nowtheyhavetheadvantageagain.In1996,inoneofhis
随机试题
国际货物集装箱运输中使用的托运单,是集装箱运输最为重要的单据之一,每一联托运单都有专门的用途,其中标有“装货单”字样的第四联被用作是()
基金资产估值的最终目的是()。
某银行2012年初对国内整个房地产行业贷款8000万元,后由于我国房市震荡,造成银行无法按期收回贷款,该风险属于()
如果市场投资组合的实际收益率比预期收益率大3%,β=2,则证券i的实际收益率比预期收益率大()。
安全管理计划的制定,需要根据本单位的实际把带有周期性的、可预见的安全工作分类汇总,按照安全工作要求,分解到每个月,形成全年安全工作计划。安全管理计划可以采用文字形式或文字与图表相结合的形式。项目安全管理计划的实施就是进行项目安全管理的过程,是在项目实施过程
在信息技术整合的课堂中,学生每人拥有一台电脑并与教师的电脑相连形成局域网,同时配有网络教学监控系统。这属于()的课堂组织形式
随着社会的发展,人们经济生活水平的不断提高,老年人充实的物质生活已远不能替补内心的空寂,为了能让子女们上班放心,老年人在家安心,使他们的老年生活不再孤独和无助,我们动足了脑筋。以前,在乡下,邻里间开门就见面,关系好的就像自家人,互相都有个照应。可现在搬到这
“十一”期间,某市公交系统在许多线路上增加了临时站点,防止客流量在某地过度集中,以缓解重大节假日期间由人流聚集造成的交通堵塞状况。但实际看来,问题并没有得到解决。以下论断如果为真,无助于解释上述现象的是()
下列文学常识的叙述错误的是()。
Ifasubstanceisdissolvedinwaterorheated,itmay______agas.
最新回复
(
0
)