According to World Health Organization, how many people am killed by outdoor air pollution? According to Bobby Peek, targeting

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问题 According to World Health Organization, how many people am killed by outdoor air pollution?
According to Bobby Peek, targeting the companies would be difficult as it would be near-impossible to prove that illnesses suffered were caused by ______.

选项

答案pollution coming from a particular plant。

解析 根据题干定位到第四个小标题第三段末句。即:证明疾病是由一种来自特殊植物的污染而造成的,故得答案。
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