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  3. About two-thirds of the world’s population is expected to live in cities by the year 2020 and, according to the United Nations,

About two-thirds of the world’s population is expected to live in cities by the year 2020 and, according to the United Nations,

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问题    About two-thirds of the world’s population is expected to live in cities by the year 2020 and, according to the United Nations, approximately 3.7 billion people will inhabit urban areas some 10 years later. As cities grow, so do the number of buildings that characterize them: office towers, factories, shopping malls and high-rise apartment buildings. These structures depend on artificial ventilation systems to keep clean and cool air flowing to the people inside. We know these systems by the term "air-conditioning".
   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 circulation of air inside a closed environment — such as an office building — can spread disease or expose occupants 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, in most cases due to poor design. This warm air was, needless to say, the perfect environment for the rapid growth of disease-carrying bacteria originating from outside the building, where it existed in harmless quantities. The warm, bacteria-laden air 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 ducts. Cases of Legionnaire’s disease are becoming fewer with newer system designs and modifications to older systems, but many older buildings, particularly in developing countries, require constant monitoring.
   The ways in which air-conditioners work to "clean" the air can inadvertently cause health problems, too. One such way is with the use of an electrostatic precipitator, which removes dust and smoke particles from the air. What precipitators also do, however, is to emit large quantities of positive air ions into the ventilation system. A growing number of studies show that overexposure to positive air ions can result in headaches, fatigue and feelings of irritation.
   Large air-conditioning systems add water to the air they circulate by means of humidifiers. In older systems, the water used for this process is kept in special reservoirs, the bottoms of which provide breeding grounds for bacteria and fungi which can find their way into the ventilation 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 antibodies to fight off the organisms found at the bottom of system reservoirs. Chemical disinfectants, called "biocides", that are added to reservoirs to make them germ-free, are dangerous in their own right in sufficient quantities, as they often contain compounds such as pentachlorophenol, which is strongly linked to abdominal cancers.
   Finally, it should be pointed out that the artificial climatic environment created by air-conditioners can also adversely 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°C, our normal temperature. This leads to a weakened immune system and thus greater susceptibility to diseases such as colds and flu.
The passage intends to______.
选项 A、inform people of air-conditioning dangers
B、explain old air-conditioning defects
C、show the air-conditioning influence on people’s health
D、tell people the need to abandon old air-conditioning
答案A
解析    作者意图。回顾全文结构发现：第一段有城镇化引出城市人口激增，导致对通风系统的依赖；第二段马上点明通风系统的危害；其余各段分别指出具体的危害——兵团病、正离子带来的疾病、免疫抗体紊乱及癌症、免疫力下降及感冒等。总之，本文重心是告知读者空调带来的危害，即选项A。【知识拓展】本：丈的结构有助于厘清作者的写作意图。第一段是引子，第二段点出主旨，其余各段分别阐述不同方面的危害。这样就可以看出，文章大篇幅陈述空调的弊端。本题比较强大的干扰项是C，因为文章确实提到了空调对人体健康的影响，但是回顾全文，是作者的意见表达，而非科学知识的普及(show)，所以选项的关键词是判断的有力工具。
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