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天使追梦

“Life expectancy” is the average age at death of the entire live-born population. In the middle of the nineteenth, 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 today



答案是B.

我的问题是：

1、E怎们不对？

2、强烈怀疑逻辑里是不是有一类教数学题呀。。

mudiduange

E选项是无关选项啊。做体力劳动怎么，和寿命有什么关系呢？

如果E选项后面再加点内容：so they could keep healthier condition,这样就相关了

天使追梦

E选项是无关选项啊。做体力劳动怎么，和寿命有什么关系呢？

如果E选项后面再加点内容：so they could keep healthier condition,这样就相关了

-- by 会员 mudiduange (2010/9/7 0:07:42)

总是自high。。怎么能控制这个毛病呢？~

mudiduange

呵呵，开始都这样，做多了就好了

天使追梦

en...

hmvoice

麻烦再问你一个问题哈~

关于这个题的D选项为什么不对？

这个题的主要意思就是 19世纪的时候 人们的寿命短么~

但是D选项 说今天，在70岁左右去世的人数少于19世纪时 80岁左右去世的人 （不知道这样理解对不对）

为什么是support the argument 呢？

lucylovegreen

同问 D为什么是support呢？

yigengzhuzi

同问啊，查了帖子，发觉对D为什么support的理由没有讲清楚呀