Statisticians studying the health effects of uranium mining on Navajo communities have found others besides miners and millworkers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.
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Achildren's cancer, and altered birth ratios of males and females are much higher
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Bcancer among children, and altered male and female ratios at birth are much higher
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Ccancer among children, and altered birth ratios of males and females occur much more frequently
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Daltered birth ratios of males and females, and children's cancer are much higher
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Ealtered male and female ratios at birth, and cancer among children occur much more
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显示答案
正确答案: C