GMAT 逻辑分析题 (8)

sanlingjie

楼主~~~~~又是我~~~~~~我想请教你一提OG上的CR，我看你之前帮别人解答过答案C，可是我对答案D，不明白，为什么OG解释是support，我以为是无关。因为D完全没有提到19世纪，只是进行了现在人平均年龄的对比。你帮我看看吧。下面是原文和选项

OG12逻辑第1题

1. “Life expectancy” is the average age at death of the entire live-born population.
In the middle of the nineteenth century, life expectancy in North America was 40
years, whereas now it is nearly 80 years. Thus, in those days, people must have
been considered old at an age that we now consider the prime of life.

Which of the following, if true, undermines the argument above?


(A) In the middle of the nineteenth century, the population of North America was
significantly smaller than it is today.


(B) Most of the gains in life expectancy in the last 150 years have come from
reductions in the number of infants who die in their first year of life.


(C) Many of the people who live to an advanced age today do so only because of
medical technology that was unknown in the nineteenth century.


(D) The proportion of people who die in their seventies is significantly smaller
today than is the proportion of people who die in their eighties.


(E) More people in the middle of the nineteenth century engaged regularly in
vigorous physical activity than do so today.

sanlingjie

额。。不好意思。。D不是现在平均年龄的对比，是现在人70和80岁人数的对比。。。但这也和结论无关啊。。结论涉及19世纪，但这个不涉及的~~~~~~~~~·真的不明白为啥是support