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PASSAGE TWOWhen the warm air was sucked back.由题干关键词“bacteria”和“ventilation syste
PASSAGE TWOWhen the warm air was sucked back.由题干关键词“bacteria”和“ventilation syste
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2024-11-21
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问题
PASSAGE TWO
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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险就是军团病。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吸回了进气孔,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,不足以产生危害。可见,细菌是在热空气被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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