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题目内容
"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?
  • AIn the middle of the nineteenth century, the population of North America was significantly smaller than it is today. 分析该选项
  • BMost 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. 分析该选项
  • CMany of the people who live to an advanced age today do so only because of medical technology that was unknown in the nineteenth century. 分析该选项
  • DThe proportion of people who die in their seventies is significantly smaller today than is the proportion of people who die in their eighties. 分析该选项
  • EMore people in the middle of the nineteenth century engaged regularly in vigorous physical activity than do so today. 分析该选项
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正确答案: B
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  • 所属科目:逻辑CR
  • 题目来源1:OG12-1
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