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　　The National Research Council states that children have a higher daily average intake than adults per kg of bodyweight.[29]:23 Those who work outside, or have urine problems also will drink more water. osteosarcoma, a rare bone disease affecting male children, has been associated with fluoride intake[40]. The weight of the evidence, as assessed by independent committees of experts, comprehensive systematic reviews, and review of the findings of individual studies does not support an association between water fluoridated at levels optimal for oral health and the risk for cancer, including osteosarcoma, [41] although a study described as the most rigorous yet by the Washington Post found a relationship among young male boys. The authors‘ adviser faced an investigation based on his dismissal of the results and an apparent conflict of interest.[42] An epidemiological connection between areas with high intake of silicofluorides and increased lead blood levels in children has been observed in areas fluoridated at the recommended dosage.[43][44] A 2007 update on this study confirmed the result and noted that silicofluorides, fluosilicic acid and sodium fluosilicate are used to fluoridate over 90% of US fluoridated municipal water supplies.[45]大家在进行托福备考的同时，如果对考位方面也比较紧张，可联系辛达代报为您服务