题型：概要写作 题类：模拟题 难易度：困难
上海市向明中学2019届高三下学期英语3月质量监控试卷（音频暂未更新）
The Possible Health Dangers of Air-conditioners
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' cooling towers was somehow sucked back into the air intake, 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. 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 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 working 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.
假设你是李华。你的美国笔友Susan要在暑假来中国桂林参加一个文化交流活动。 她想提前了解一下这座城市的相关情况，写信向你询问，请根据以下提示信息，给她回一封信。
自然情况 | 位于中国的南部，气候温和，风景优美 |
景点 | 四面环水，七星公园，漓江，象鼻山等 |
美食 | 桂林米粉，辣椒酱 |
...... |
注意： 1）词数100左右，开头和结尾已经给出，但不计入总数；
2）可适当增加细节，以使行文连贯；
3）参考词汇 象鼻山 Elephant Trunk Hill chilli sauce
Dear Susan,
I'm glad that you are coming to Guilin for an exchange program during the summer holiday.
Yours
Li Hua
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