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
2016-09-21
27
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 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.
In the old air-conditioned systems, bacteria first develop _____.
选项
A、in the reservoirs
B、in the ventilation system
C、in the humidifiers
D、in the air intake
答案
A
解析
本题考查复合句的理解。只要明白第3段第2句这个非限制性定语从句中的the bottoms of which中的which是指上文的reservoirs,问题就不难解决了。
转载请注明原文地址:https://kaotiyun.com/show/DNY7777K
0
大学英语四级
相关试题推荐
China’surbanizationwillreleasethefullpotentialofdomesticdemand.Someeconomistspointoutthaturbanizationisaproces
Friendsplayanimportantpartinourlives.Andalthoughwetaketheactoffriendshipforgranted,weoftendon’t【B1】______und
Friendsplayanimportantpartinourlives.Andalthoughwetaketheactoffriendshipforgranted,weoftendon’t【B1】______und
Friendsplayanimportantpartinourlives.Andalthoughwetaketheactoffriendshipforgranted,weoftendon’t【B1】______und
据说《茉莉花》(JasmineFlower)是流传到海外的第一首中国民歌。许多国外学者在研究中国音乐史时都提到了《茉莉花》,不少外国人学唱中文歌时首选这首歌。2004年雅典奥运会(AthensOlympics)闭幕式上,一位中国小姑娘唱起《茉莉花》,给
TheBritishgovernmentrecentlyannouncedaproposaltointroducehealthcareaccessfeesformigrantsandlong-termvisitorsth
AlthoughtheOlympicCharter,theofficialconstitutionoftheOlympicmovement,proclaimsthattheOlympicsarecontestsamong
据说《茉莉花》(JasmineFlower)是流传到海外的第一首中国民歌。许多国外学者在研究中国音乐史时都提到了《茉莉花》,不少外国人学唱中文歌时首选这首歌。2004年雅典奥运会(AthensOlympics)闭幕式上,一位中国小姑娘唱起《茉莉花》,给
InordertohosttheOlympics,acitymustsubmitaproposaltotheIOC.Afterallproposalshavebeensubmitted,theIOCvotes.
随机试题
当事人提出的民事再审申请书必须经决定是否引起再审。()
阳明温病,热结阴亏,燥屎不行,下之不通,舌红而燥者。治宜选用
采用门店接待法开拓客源信息的劣势主要是()。
监理工作流程应该在( )作出明确规定。
简述我国教育法体系的几个基本层次。
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
延期年金
下列关于软件著作权中翻译权的叙述不正确的是:翻译权是指______的权利。
A、 B、 C、 D、 A有两种错误可能造成事务故障:逻辑错误和系统错误。系统故障是指硬件故障或者是数据库软件或操作系统的漏洞,导致系统停止运行。主存储器内容丢失,而外存储器仍完好无损。磁盘故障是指在数据传送
将下面程序补充完整。publicclassPowerCale{ publicstaticvoidmain(String[]args){ doublex=5.0; System.out.println(x
最新回复
(
0
)