题目

Directions: Read the following passage. Summarize the main idea andthe main point(s) of the passage in no more than 60 words. Use your own wordsas far as possible.The Possible Health Dangers ofAir-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 isthat of Legionnaire'6．打开相水能闻到香水的味道，其原因是（　　）A．分子的质量很小B．不同分子性质不同C．分子不断运动D．分子间有间隔