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  3. 【F1】The concept of life expectancy at birth is well understood by most people: the average age in which babies bom today will di

【F1】The concept of life expectancy at birth is well understood by most people: the average age in which babies bom today will di

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问题    【F1】The concept of life expectancy at birth is well understood by most people: the average age in which babies bom today will die if death rates throughout their life course resemble those today. We have known for decades that in the U.S., on average, women live longer than men; whites live longer than blacks; and the rich and well educated live longer than those with low socioeconomic status.
   【F2】What we are only recently beginning to understand, however, is that educational attainment is becoming the single most important social determinant of longevity in America. The new research shows that college-educated white women are expected to live 9.3 years longer than their low-educated counterparts—those who have not completed high school—compared with only a 2.5-year difference in 1990.
   Variation is perhaps the second most important measure in statistics—the first being the average— summarizing the extent to which observations are spread around the average. 【F3】For example, we can observe two populations with identical life expectancy, but, from an individual perspective, the one with larger variation in life spans will have greater uncertainty in the age of death. If life span variation is very small, most deaths are concentrated close to the average; if variation is large, some individuals will die prematurely, whereas others will survive to a very old age.
   To put it concretely, if you had to bet on how long you will live, your best bet would depend more than anything else on your educational attainment. 【F4】Although betting on how long we will live may seem like an odd endeavor, this is precisely what we do, whether implicitly or explicitly, when we make decisions throughout the course of our life.
   Variation in life spans also affects the social and economic institutions planning for our old age, including the Social Security Administration and programs like Medicare. They too have to balance between contributions and benefits in an era of growing uncertainty about how long we will live. Perhaps more fundamental, the growing inequality in life spans—both in average and in variability—raises questions concerning distributive justice. 【F5】For example, if those at the lower rungs of the socioeconomic ladder are less likely to survive to old age—and, importantly, face greater uncertainty about their chances of survival—should we institute a differential retirement age? And what would such a scheme look like?
【F3】
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答案比如说，我们可以观察到两组平均寿命相同人群，但是，从个人的角度来说，预期寿命变化较大的一组人群，其死亡年龄具有更大的不确定性。
解析 ①本句是由转折连词but连接两个简单句的并列句；两个分句均为主谓宾结构。②分句1中，介词短语with identical life expectancy为后置定语，惨饰宾语two populations，说明这两组人群的平均寿命相同。③分句2中，from an individual perspective为方式状语，表示从个人角度来看；the one指代前句中两组人群中的其中一组，介词短语with larger…spans为后置定语，修饰the one，说明这是寿命变化较大的人群；句末的in the age of death作状语。
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