大全3-19

[邁向高等學府]

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.
(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.

答案為A
可是我不了解題目在問什麼？
可以解釋一下嗎？
感恩

[liwuu]

題目說美國黑人得到高血壓是美國白人的兩倍
類似情形發生在洋化的黑非洲人與白非洲人
研究者假設此特性在於洋化的黑非洲人 吃高鹽量的飲食但基因偏向適合低鹽量的環境...(即學者認為這兩個因素同時存在時才會造成容易得高血壓的情形)
問支持...?!
選項A,在從以前就多鹽的非洲國家如Senegal and Gambia,得到高血壓的人少(即如果基因偏像是何多鹽量的環境,則較少會得到高血壓...),加強說明學者假設的interaction存在

[dibert8]

黑人的基因在高鹽的環境下,不會得高血壓;西化之後基因已適應缺鹽的環境,因此吃含鹽高的飲食比白人更容易得高血壓. => (A)

[CherrieLi]

不好意思...請問C錯在哪邊呢?

(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.

consumption=diet 下降 --> blood pressure下降... 支持假設