59. 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.
答案选A，但原文中说的 “genes that adapted to an environmental scarcity of salt”应该是说
非洲本土是缺盐的啊。A中的 “Senegal and Gambia, where salt was always available”是不是反了呢？
81. Any tax relief received by the solar industry would not benefit the homeowner who installs a solar-energy system. Even though homeowners would pay a lower price for solar-energy system installations because of this tax relief, with the government paying the balance, government revenues come from the public.
The argument above is based on which of the following assumptions?
(A) The tax relief would cause the homeowner to lose, through taxes or reduced government benefits or both, an amount at least equal to the reduction in the price of that home- owner's solar-energy system installation.
(B) The tax relief that would be received by solar-energy industries would not be offered at the same time as any tax relief for other industries.
(C) Advertisements of the solar-energy industry, by failing to identify the source of government revenues explicitly to the public, mask the advantage the industry receives from the public.
(D) Homeowners generally believe that they benefit from any tax relief offered to the solar-energy industry.
(E) Tax relief would encourage solar industries to sell solar-energy systems at higher prices.
答案选A，但不明白为什么会cause the homeowner to lose？
59题：原文hypothesis是说blood pressure high 是由于genes 适应缺salt的环境造成的
问题是comfirm, answer1: 说的就是基因适应多salt 环境导致blood pressure low.
不知道这么理解对不对，请NN指点
59题snowflower分析的有道理，答案a刚好是原文的逆否命题，承认原文成立，a必然成立。
81题是假设题形。ets上说假设题将答案取非将会削弱原文的结论。原文的结论是 太阳能工业税收的减免不能使安装太阳能系统的homeowner们受益。b、c、d、取非明显和原文结论无关。e中取非后刚好原文中提到Even though homeowners would pay a lower price for solar-energy system installations，所以也不能削弱结论。a中说The tax relief would cause the homeowner to lose，取非后，如果homeowner没有lose，原文的答案就说不过去了。至于是什么导致the homeowner to lose可能关键是government revenues come from the public，政府为了收支平衡，在这上面的损失有可能是通过收取homeowner其他方面的费用来弥补导致the homeowner to lose。这个其实不是很重要。不知道我说的对不对。
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