请教一道逻辑题

非常男女

请教这道逻辑题, 答案是A.我个人觉得D还算沾边, 可A让我 绞尽脑子也想不出所以然. 不知哪位大侠可帮到我?

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.
(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.

joywzy

an environmental scarcity of salt.==》predisposition ：interaction between western high-salt diets and genes ==》develop high blood pressure.

A：salt was always available, ==》The blood pressures was low

so support.

非常男女

Hi, Joywzy,
让我一下子豁然开朗了. 多谢!

周末愉快!

mindfree

你要先看请题目:Which of the following statements about present-day, WESTERNIZED AfRICANS, if true, ...

所以A, D中的人中都是WA. 因此D是削弱! 意思是: 人家Yoruba也是后妈养的,怎么就没高血压呀"

A是加强: 说明和genes adapted to the environmrnt有关.