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
2023-06-29
16
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] 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://www.tihaiku.com/zcyy/2792181.html
相关试题推荐
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesin
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humido
随机试题
[originaltext]Anewstudy,aimedatdiscoveringthepositiveeffectsofbre
Ontheeveningofhis18thbirthday,ateenagerfromatinyvillagenorthern
Thepolicemanhavetheresponsibilitytowarnthepublicthat______(遵守安全规则很重要).
A.维生素C B.维生素A C.维生素B D.维生素B E.维生素B治疗
流行病学实验人群来自A.同一总体的患病人群 B.同一总体的健康人群 C.同一
1944年召开的国际货币金融会议通过的协议,将美元与黄金直接挂钩,各会员的货币与
共用题干 张某以住房抵押贷款方式购买一别墅,房价500万元,向甲银行贷款200
工作并不是一种必要的痛苦,相反,它是愉悦和价值的内在来源。工作并不只是实现目的的
谢总事业有成,经营一家拥有五百名员工的科技开发公司。平时忙于做生意,父亲节那天,
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
最新回复
(
0
)