PASSAGE TWO

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问题 PASSAGE TWO

选项

答案When the warm air was sucked back．

解析由题干关键词“bacteria”和“ventilation system”定位至第三段。该段首句指出，20世纪70年代人们发现空调带来的一种危害就是军团病。接下来解释了致病原理：从冷却塔压出的热空气又以某种方式被抽回了进气孔，这些热空气为从室外带进来的致病菌的快速繁殖提供了绝佳的温床，而在室外时，致病菌数量很少，不足以造成危害。可见，细菌是在热空气被抽吸回来时进入通风系统的，故答案为“When the warm air was sucked back．”。

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专业英语八级

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PASSAGE TWO

专业英语八级

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