OG-20 Page567 explanation

No.20  age567  explanation

自由的疑惑一： A的OG的解释，我觉得不太对，因为明显A中涉及了“建立两者之间的关系。”自由个人理解A错在“太绝对化的用词-----do not run any risk of” 中的any太绝对化了，所以错误。

自由疑惑二： B的错误，感觉OG的解释也不到位，自由个人理解，B的错误在于“late in life” 的表达其实是对原文的篡改，将时间范围明显缩小，所以错误。

愿题如下：

Increase in the level of high-density lipoprotein(HDL) in the human bloodstream lower bloodstream-cholesterol levels by increasing the body’s capacity to rid itself of excess cholesterol. Levels of HDL in the bloodstream of some individuals are significantly increased by a program of regular exercise and weight reduction.

Which of the following can be correctly inferred from the statements above?

A)     individuals who are underweight do not run any risk of developing high levels of cholesterol in the bloodstream.

B)      Individuals who do not exercise regularly have a high risk of developing high levels of cholesterol in the bloodstream late in life.

C)     a program of regular exercise and weight reduction lowers cholesterol levels in the blododstream of some individuals.

Choice A cannot be correctly inferred because the statements do not establish any connection between being underweight and levels of cholesterol. Neither Bnor E is inferable, since there is no indication that exercise alone is either necessary or sufficient to increase HDL levels or to decrease cholesterol levels.

A确实没有建立什么联系，虽说运动和降低体重可以减少这个危险，但本来体重轻的人可未必有这个好处。

B的意思也是如此，锻炼可以达到，不锻炼未必就不成，是一个必要条件和充分条件的问题。