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  3. According to World Health Organization, how many people am killed by outdoor air pollution? There is a U. N. convention that ca

According to World Health Organization, how many people am killed by outdoor air pollution? There is a U. N. convention that ca

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问题 According to World Health Organization, how many people am killed by outdoor air pollution?
There is a U. N. convention that can cover ______.
选项 A、problem between neighbors
B、problem between states which do not share a border
C、problems on air pollution
D、trans-boundary air pollution
答案C
解析 根据题干信息词a U.N. convention定位到第二个小标题末段第二句话。即：联合国在跨边界的空气污染上有协定，但是不包括邻国之间出现的每个问题，也不包括不接壤的州之间出现的问题，故选C。
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