1. Although 90 percent of the population believes itself to be well inFORMed about health care, only 20 percent knows enough about DNA. So apparently at least 80 percent of the population does not know enough about medical concepts to make well-inFORMed personal medical choices or to make good public policy decisions about health care.
The argument’s reasoning is questionable because the argument fails to demonstrate that D
(A) those people who can understand news stories about DNA are able to make well-inFORMed personal medical choices
(B) more than 20 percent of the population needs to be well inFORMed about health care for good public policy decisions about health care to be made
(C) one’s being able to make well-inFORMed personal medical choices ensures that one makes good public policy decisions about health care
(D) an understanding of DNA is essential to making well-inFORMed personal medical choices or to making good public policy decisions about health care
(E) since 90 percent of the population believes itself to be well inFORMed about health care, at least 70 percent of the population is mistaken in that belief.

2. During the 1980’s, Japanese collectors were very active in the market for European art, especially as purchasers of nineteenth-century Impressionist paintings. This striking pattern surely reflects a specific preference on the part of many Japanese collectors for certain aesthetic attributes they found in nineteenth-century Impressionist paintings.
Which one of the following, if true, most strongly supports the explanation above? C
(A) Impressionist paintings first became popular among art collectors in Europe at the beginning of the twentieth century.
(B) During the 1980’s, the Japanese economy underwent a sustained expansion that was unprecedented in the country’s recent history.
(C) Several nineteenth-century Impressionist painters adopted certain techniques and visual effects found in Japanese prints that are highly esteemed in Japan.
(D) During the 1960s and the 1970s, the prices of nineteenth-century Impressionist paintings often exceeded the prices of paintings by older European masters.
(E) During the 1980’s, collectors from Japan and around the world purchased many paintings and prints by well-known twentieth-century Japanese artists.

关于第一题 实在是不明白是什么意思！！

关于第二题 为什么不选B？

第一题的意思：有90%的人自认为对保健很了解，但是只有20%的人了解DNA.所以很明显，至少80%的人对医疗概念了解的不够，以至于不能做出好的个人医疗选择或制定关于医疗保健的公共政策。

显然，问题的症结在于DNA对于“做出好的个人医疗选择或制定关于医疗保健的公共政策”是否有影响，所以选D

agree!