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蓝皮69题
Black Americans are, on the whole, about twice as likely as White Americans to develop high blood pressure. This likelihood also holds for westernized Black Africans when compared to White Africans. Reasearchers have hypothesized that this predisposition in westernized Blacks may reflect 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 available,are low.
(B) THe unusually high salt consumption in certain areas of Africa represents a serious health problem.
(C) Because of their blood pressure levels, most White Africans 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 Saharan 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.
这道题目的答案选A， 但我想了很久也没明白过来， 另外D和E选项有错在哪里呢？
恳请各位援助，在此先谢过了！ |
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发表于 2010-11-23 21:21:20
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