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
24
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.
The author most probably wants the readers to treat biocides with an attitude of_____.
选项
A、caution
B、trust
C、enthusiasm
D、criticism
答案
A
解析
第3段最后两句讨论生物杀灭剂的用处,其中最后一句中的but,dangerous和cancers等词说明作者认为要慎用这种杀灭剂。作者并没对杀灭剂全盘否定,只是说过量使用会引发危险,因此D不对。
转载请注明原文地址:https://kaotiyun.com/show/PNY7777K
0
大学英语四级
相关试题推荐
Friendsplayanimportantpartinourlives.Andalthoughwetaketheactoffriendshipforgranted,weoftendon’t【B1】______und
Friendsplayanimportantpartinourlives.Andalthoughwetaketheactoffriendshipforgranted,weoftendon’t【B1】______und
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesinknowledge,therehasbeennocorrelativeincreasein
A、He’dbettersubmithisresumeatonce.B、Notallapplicantswillbeinterviewed.C、Shedoesneedhishelpforthemoment.D、Th
AlthoughtheOlympicCharter,theofficialconstitutionoftheOlympicmovement,proclaimsthattheOlympicsarecontestsamong
AlthoughtheOlympicCharter,theofficialconstitutionoftheOlympicmovement,proclaimsthattheOlympicsarecontestsamong
A、TheWhiteHousewarnedthemnottodonow.B、Thepanelofexpertsobjectedtheproposals.C、NASAdidn’tgetadequatemoney.D、
InordertohosttheOlympics,acitymustsubmitaproposaltotheIOC.Afterallproposalshavebeensubmitted,theIOCvotes.
InordertohosttheOlympics,acitymustsubmitaproposaltotheIOC.Afterallproposalshavebeensubmitted,theIOCvotes.
随机试题
Somecompaniesmightnotletyourentacar______youhaveacreditcard.
窝沟封闭预防龋齿的临床操作步骤是
不属于牙源性颌骨囊肿的为
在房地产开发中,建筑师关注的是项目所在地的()。
在Excel中,单击某列的列号可以选择整个列。()
分支银行制度作为商业银行的一种组织形式,兼有其优缺点,其优点主要表现在()。
从法律与国家关系的角度论述建设社会主义法治国家的必要性和重大意义。
软件危机出现于20世纪60年代末,为了解决软件危机,人们提出了_______________的原理来设计软件,这就是软件工程诞生的基础。
下列术语中,属于显示器性能指标的是()。
Asasoldier,you______doastheheadtellsyou.
最新回复
(
0
)