Black Americans are, on the whole, about twice are likely as White Americans to develop high blood pressure. This likelihood also holds for westernized Black Africans when compared to White Africans. Researchers have hypothesized that this predisposition in westernized Blacks may reflects an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt. Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers' hypothesis? A.The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always abailable, are low. B. The usually high salt consumption in certain areas of Africa represents a serious health problem. C.Because of their blood pressure levels, most White Africa have markedly decreased their salt consumption. D.Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Sahara salt mines. E.No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not. 我的理解是：专家将西化黑人易得高血压的这种倾向归结于西方高盐饮食和适应缺盐环境基因的相互作用（原文中是这样表示的：an interaction between western high-salt diets and genes），重点在这个interaction！！不知道为什么看了好多帖子压根没提这个interaction。。。。。。 而A选项：那些生活在多盐地区的黑人后代血压并不高。我认为是刨除了适应缺盐基因这个元素，而单独只有西方高盐饮食这一个元素并不会导致血压变高，从而也就加强了两者相互作用导致易得高血压倾向的这个现象。也就加强了专家的假设。 但是我也不知道自己的这个理解对不对。。。。恳请NN帮忙解释一下！~
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发表于 2012-10-11 21:50:51
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