According to World Health Organization, how many people am killed by outdoor air pollution? It found that increases in air poll

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问题 According to World Health Organization, how many people am killed by outdoor air pollution?
It found that increases in air pollution tended to ______.

选项

答案aggravate asthma symptoms in children。

解析 根据题干定位到第四个小标题首段末句。即:空气污染的增加恶化孩子的哮喘症状,故得答案。
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