首页
登录
职称英语
Although many of us may feel air-conditioners bring relief from hot, humid o
Although many of us may feel air-conditioners bring relief from hot, humid o
游客
2023-07-02
14
管理
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. [br] 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
事实细节题。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://tihaiku.com/zcyy/2801307.html
相关试题推荐
Theconceptofculturehasbeendefinedmanytimes,andalthoughnodefiniti
Theconceptofculturehasbeendefinedmanytimes,andalthoughnodefiniti
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegrees
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegrees
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegrees
Theconceptofculturehasbeendefinedmanytimes,andalthoughnodefiniti
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesin
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesin
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesin
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesin
随机试题
[originaltext]M:MayIclosethewindow?W:Yes,please.It’stoonoisyoutside
中国革命进入新民主主义革命阶段的标志是()A.辛亥革命 B.五四运动 C.
在电网络分析中,常用的建立状态方程的方法是()A.直观法 B.系统法
A.正畸治疗应尽量应用容易清洁的矫治器,如弹性牵引 B.正畸治疗应尽量应用容易
A.血尿、蛋白尿、高血压、肾减退 B.发作性肉眼血尿,无水肿与高血压 C.血
患者,男,40岁。患风湿性心脏瓣膜病多年。症见心悸气短,神疲乏力,咳嗽喘促,颧颊
关于多层砌体房屋的抗震构造措施,说法正确的有( )。A.设置钢筋混凝土圈梁与构
生态环境对于城镇化的影响包括( )两个基本方面,它们常常是同时叠加于一个地区的
在采购个人咨询专家的程序中,当咨询顾问招标结束后,银行或借款人将与中标的咨询顾问
工程总承包模式相对于工程设计、施工、设备采购分别承包模式具有优势特点,因此,工程
最新回复
(
0
)