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
2020-01-09
20
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.
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://kaotiyun.com/show/bUp7777K
0
大学英语四级
相关试题推荐
Themassmediaisabigpartofourculture,yetitcanalsobeahelper,adviserandteachertoouryounggeneration.Themass
A、Howmuchairnormallygoesthroughyournosewhenyoutalk.B、Theforceofairthatcomesfromthelungs.C、Thehighnessorlo
Intoday’sworld,onlinesocialmediahasbecomemorepowerfulandthemostdestructivethingoverworldwide.Althoughwithtime
There’ssomethingrotteninthestateofwomen’shealth.AsthisarticleisbeingwritteninJuly,RepublicansinCongressare【C
A、Apieceofmulti-usefurnitureforkids.B、Acameraforwatchingchildreninanotherroom.C、Ayoungboy’sdailylifewithhis
Manyparentsmaythinkthateachnewsibling(兄弟姐妹)offerstheirchildrenthegiftofcompanionship.Butwhilewetendtothinkth
Thereisnomorefashionablesolutiontothecurrentglobalrecessionthan"greenjobs."Manycountriesarealleagerlypromotin
Onamoremundane(世俗的)level,third-generationmobiletelephones,despiteallthedelaysandthebillionssquanderedon3Glice
Pub-talkA)Pub-talk,themostpopularactivityinallpubs,isanativedialectwithitsowndistinctivegrammar.Thereare
It’sveryinterestingtonotewherethedebateaboutdiversity(多样化)istakingplace.Itistakingplaceprimarilyinpolitical
随机试题
Itisafantasticlandscapethatwe______.
麦氏(McBumey)点是指
功能化湿开窍,宁心安神的是功能祛痰开窍,宁心安神的是
女患儿,5岁,症见形体明显消瘦,肚腹膨胀,面色萎黄无华,毛发稀疏,面黄,精神不振,易烦躁激动,睡眠不宁,咬指磨牙,食欲减退。此患儿的治法是
违反合同承担违约责任的形式有( )。
中国银监会规定操作风险应当包括法律风险和声誉风险。()
下列各种还款方式中,各定期还款额逐次递减的有()。
某乡镇在发展中痛定思痛,关停并转高耗能、高污染企业,复原古色古香的老街、开发生态茶园及果蔬基地,打造文化小镇、生态小镇。这种“腾笼换鸟”式的发展理念属于:
一项调查表明,某中学的学生对悠悠球的着迷程度远远超过其他任何游戏,同时调查发现,经常玩悠悠球的学生的学习成绩比其他学生相对更好一些。由此看来,玩悠悠球可以提高学生的学习成绩。以下哪项为真,最能削弱上面的推论?()
党的十六大以来,我们深入贯彻落实科学发展观,农业生产得到很大发展、农村面貌得到很大改善、农民群众得到很大实惠,农业农村发展实现了历史性跨越,迎来了又一个黄金期,初步探索出一条中国特色农业现代化道路。下列说法中不正确的是()。
最新回复
(
0
)