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题库 / GMATAdvanced-SC-21
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.
children’s cancer, and altered birth ratios of males and females are much higher
cancer among children, and altered male and female ratios at birth are much higher
cancer among children, and altered birth ratios of males and females occur much more frequently
altered birth ratios of males and females, and children’s cancer are much higher
altered male and female ratios at birth, and cancer among children occur much more
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三个列举的对象中，只有ratio可以用higher表示，cancer和defects没有办法higher，所以抽主干C更合理（举例：总不能说cancer是更高的，只能说cancer发生更频繁）
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