为何选C啊?谢谢

zephyr1977

A long-term health study that followed a group of people who were age 35 in 1950 found that those whose weight increased by approximately half a kilogram or one pound per year after the age of 35 tended, on the whole, to live longer than those who maintained the weight they had at age 35. This finding seems at variance with other studies that have associated weight gain with a host of health problems that tend to lower life expectancy.

Which one of the following, if true, most helps to resolve the apparently conflicting findings?

(A) As people age, muscle and bone tissue tends to make up a smaller and smaller proportion of total body weight.

(B) Individuals who reduce their cholesterol levels by losing weight can thereby also reduce their risk of dying from heart attacks or strokes.

(C) Smokers, who tend to be leaner than nonsmokers, tend to have shorter life spans than nonsmokers.

(D) The normal deterioration of the human immune system with age can be slowed down by a reduction in the number of calories consumed.

(E) Diets that tend to lead to weight gain often contain not only excess fat but also unhealthful concentrations of sugar and sodium.

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tongxun

题目的矛盾在于：一般的研究说明体重的增加是不利于长寿的，保持体重才利于长寿。现在这部分人群体重保持了（Smokers tend to be leaner than nonsmokers）却不长寿。为什么？因为有更不利于长寿的因素存在：吸烟。这不就调和了现在的调查结果和其他研究间的矛盾了吗？
再感觉感觉。

zephyr1977

明白了,谢谢.
惭愧啊,自己是不是太愚笨了.