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8. The Environmental Protection Agency provided misinformation about the water problem to the mayor of Flint, who came on TV to show the water was safe.
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9. Marc Edwards, an engineering professor, has been appointed by the Michigan Governor to deal with the water crisis in Flint
10. Marc Edwards formed a water study team and spent a large amount of his own money on his research and investigation.
使用化学药物对病原微生物、寄生虫、恶性肿瘤细胞所致的疾病进行治疗，称为（）。
化疗药物的半数致死量与半数有效量的比值，称为（），是评价化疗药物安全性的重要参数。
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