Critical Reasoning
试题详情
文章：
"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
题目：
Which of the following, if true, undermines the argument above?
选项:
A、In the middle of the nineteenth century, the population of North America was significantly smaller than it is todaMost 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、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
C、The proportion of people who die in their seventies is significantly smaller today than is the proportion of people who die in their eighties
D、More people in the middle of the nineteenth century engaged regularly in vigorous physical activity than do so today
答案:
B
提问：
这道题目结论没有看明白，是人们活的更久了吗？ 如果是那么选项总体方向是人们并不是活的更久了。错选C选项，许多人活得更久是因为先进的医疗技术，人们活的更久不是因为自身而是外部技术导致。 B选项平均寿命的增加是由于婴儿夭折的数量减少，不太明白这个选项的场景… 请老师讲解下
评分:
0
浏览:
859
