大學英語四級閱讀練習及答案
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 inthe 1970s. This was found to have affected people in buildings with air-conditioning systems in which warmair pumped out of the system’ cooling towers was somehow sucked back into the air intake (通風口),in mostcases due to poor design. The warm air, filled with bacteria,was combined with cooled, conditioned air andwas 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 (溼度調節器)der systems, the water used for this process is kept in special reservoirs, the bottoms of which providebreeding grounds for bacteria which can find their way into the ventilation (通風)system. The risk to human health from this situation has been highlighted by the fact that the immune systems (免疫系統)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 canalso 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 changges. In an air-conditioned living or working environment, however, body temperatures remain well under37℃, our normal temperature. This leads to a weakened immune system and thus greater exposure to diseases such as colds and flu.
練習題:
Choose correct answers to the question:
do we know about Legionnaire’s disease from the passage?
was the most wid
-
小學生散文《根》閱讀答案
給葉子以無限生機,給花朵以青春的省略,它將自己的生命無私地獻給了大地!它千姿百態,碩果給人間美的享受!你可知道它是誰嗎?它就是被埋在地下,延伸到土層中的根!提到根,也許有人不屑一顧地說:實在不美,自甘被埋沒,不是愚昧,也是呆板。殊不知這樣的理解也未免太淺薄!根的...
-
挺立的椿樹的閱讀答案
挺立的椿樹文/郭軍平上下班路上,總要經過那條街道,而在那條街路上,總能看到一棵獨立挺拔的椿樹,在繁華的街道路旁,尚沒有花草樹木,因而這棵椿樹格外顯眼,每次擡頭望去,總是看到椿樹挺拔在藍天白雲中,顯得遼闊而壯觀。只要駐足一下,椿樹挺立的姿勢似乎讓你忘懷街道的喧鬧...
-
《一枚古金幣》閱讀答案
閱讀理解要畫出在文章的結構上起過渡、連接作用的詞語、句子、段落,畫出各段落中的中心句,尤其注意段首、段尾,這些詞句往往就是回答問題時需要重點研讀的,透過找重要的詞句進一步理解文章的每段內容,各段聯繫,思路,結構層次。以下是小編幫大家整理的《一枚古金幣》閱...
-
《憶田先生》閱讀題及其答案
閱讀下面的文字,完成11-15題。(20分)憶田先生朱以撒⑴田先生已經過世十多年了。他是我來到這個陌生城市比較早結識的一位長輩。他在這個城市的書法界有着舉足輕重的地位,有着自己的學生,自己的威望。田先生待我還是比較友好的,他相貌清癯、言說平靜,也使我有好感,也跟...