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  3. According to World Health Organization, how many people am killed by outdoor air pollution? The pesticide DDT can be effective

According to World Health Organization, how many people am killed by outdoor air pollution? The pesticide DDT can be effective

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问题 According to World Health Organization, how many people am killed by outdoor air pollution?
The pesticide DDT can be effective against ______.
选项 A、malaria
B、wildlife
C、animals
D、human nervous system
答案A
解析 根据题干信息词the pesticide DDT定位到第二个小标题下的第二段。即：杀虫剂DDT会伤害野生动植物并且能影响人类的神经系统，但对预防疟疾是很有效的(be effective against malaria)，故选A。
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