大全-3-19

19.   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.

Researchers 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.多盐，高血压少，支持

(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.无关

(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.讲后面的结果，跟解释原因没有关系

(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.少盐血压低，反对了（A）

(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.无关

A是答案没有疑问

请问E算不算答案

排除了另一种可能 即differences in salt metabolism leads the differences in blood pressure.

谢谢

谢谢lawyer 明白了

我的老毛病还是没治好