OG12 Q1 请教!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

annazyan

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. B

(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.

我对E 选项有点疑问
OG上的解释是选项没有说明 有多少人进行锻炼？是否帮助他们延长寿命？延长多久？等问题，对寿命的影响不能从文中得知，所以 Little effect on the argument。
我的理解是 19世纪人们更多的physical exercise应该是延长他们的寿命的，但现在19世纪的average age反而低于现在，所以weaken了。

求大家解答。本人刚入门CR对于weaken感到很找不到头绪。。。谢谢~

annazyan

额.........自顶- -求解答
谢谢各位大神~！