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
2018-05-09
54
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.
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://jikaoti.com/ti/r5RFFFFM
0
大学英语四级
相关试题推荐
Peoplewholiveinheavilyindustrializedareasdonotgetasmuchsunlightastheyshould.Dust【C1】______overacityataltitud
EvergladesNationalParkA)WhenmanypeoplethinkofFlorida,imagesofsandycoastlinesorthemeparkridescometomind.B
SevenWaystoCreateaHappyHouseholdA)Everyfamilyisdifferent,withdifferentpersonalities,customs,andwaysofthink
It’sveryinterestingtonotewherethedebateaboutdiversity(多样化)istakingplace.Itistakingplaceprimarilyinpolitical
It’sveryinterestingtonotewherethedebateaboutdiversity(多样化)istakingplace.Itistakingplaceprimarilyinpolitical
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonlyslightlyfromplacetoplace.Nevertheless,someof
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobservedThreeperiodsofdev
A、Theyaregoingtoaverycoldplace.B、Theirplanewilltakeoffinonehour.C、Thewomanisgoingtobringmorethanonecase
A、Thecitycanbealonelyplace.B、LifeintheWestcanbeverydangerous.C、PeopleintheWestarefondofanimals.D、Thedog
A、Theywanttogetcleanandhealthyfruitsandvegetables.B、Theydon’twanttodependonfarmersinruralareasanymore.C、Th
随机试题
小麦粉在正常状态下,加工精度越高,麸皮含量越多。
以下除哪项外,都体现了阴阳的互根关系
A舌苔由腐转腻B舌苔由厚转薄C舌苔由润转燥D舌苔由薄转厚E舌面光洁如镜病邪由表人里多见
ABC会计师事务所的A注册会计师负责审计多家被审计单位2017年度财务报表。与存货审计相关的部分事项如下:(6)A注册会计师在己公司盘点结束后、存货未开始流动前抵达盘点现场,对存货进行检查并实施了抽盘,与己公司盘点数量核对无误,据此认可了盘点结果
在依法取得使用权的土地上新建房屋应当在竣工后2个月内申请办理房屋所有权登记。()
一般资料:求助者,男性,30岁,公司职员案例介绍:求助者原计划在四月份举行婚礼,准岳母却以求助者父亲没有兑现“全款买房”为由,不同意女儿马上结婚。女儿站在了母亲的一边,认为求助者的父亲只支付了六十万首付,购房中没有自己的名字是对他们母女的轻视和
下列对“温室效应”这一概念的理解,准确的一项是______。根据原文,全球气候变暖带来的影响最严重的一项是______。
关于防火墙的功能,以下哪一种描述是错误的?
______是构成C语言程序的基本单位。
A、Shewasrunningafever.B、Shehadtorunalongwaytothemeeting.C、Shewasinvolvedinacaraccident.D、Shehadhercars
最新回复
(
0
)