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Passage Two When did bacteria come into ventilation system according to the passage?
Passage Two When did bacteria come into ventilation system according to the passage?
admin
2022-09-27
23
问题
Passage Two
When did bacteria come into ventilation system according to the passage?
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。接下来解释了空调的致病原理: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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