It has become fashionable to issue dire projections of declining prosperity based on demographic aging. But is that really such

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问题    It has become fashionable to issue dire projections of declining prosperity based on demographic aging. But is that really such a problem?
   There is no doubt that all countries of the world are getting older, but they are at very different stages of the process. The median age in the United States — with half the population older and half younger — is currently 36. In Ethiopia, it’s 18, owing to a higher birthrate and a lower life expectancy. In other African countries, it’s even lower. The world’s oldest country is Germany, where the median age is 45.
   The pattern is very clear: The young countries are poor, and the old countries are rich. So why do people fear population aging? I see two reasons. The first is psychological: The analogy to individual aging suggests that as populations get older, they grow frail and lose mental acuity. The second comes from economists and an indicator called the dependency ratio, which assumes that every adult below age 65 contributes to society, and everybody above 65 is a burden. And the proportion of people older than 65 is bound to increase.
   Yet we also know that the productivity of some individuals is much higher than that of others, independent of age. Nothing is inherently special about the age of 65. Many people live longer and do so mostly in good health. The saying "seventy is the new 60" has a sound scientific basis. Meanwhile, education has been shown to be a key determinant of better health, longer life and higher productivity (not to mention open-mindedness). The active aging of better-educated populations can be an asset rather than a problem.
   To appreciate how projections based on the simplistic dependency ratio can be misleading, consider the two population billionaires, China and India. In 2050 China’s population will be older than India’s because of its more rapid fertility decline. But so what? China’s population is much better educated and therefore much more productive. Furthermore, only a minority of Chinese will retire at age 65. We can expect most Chinese to make meaningful contributions through work as long as they are in good health, particularly if they find their jobs interesting and satisfying. Again, this is largely a question of education. In India today, one out of three adults has never seen a school from the inside. In China only 8 percent, mostly elderly, have no schooling. In India, 50 percent of young women have less than a junior secondary education; in China, the figure is only 15 percent. Knowing how important education is to economic performance, who would seriously claim that India’s future is brighter than China’s owing to slower aging?
   Population aging is not irrelevant, but it should be seen in conjunction with other dimensions of human capital, especially education and health. Here the prospects are good. In most countries of the world — with the notable exception of the United States — the young are clearly better educated than the old and may thus compensate for their smaller numbers through higher productivity.
   Viewing the quality of human capital as resting on a collection of elements, many of them manageable, is something that the private sector has been doing for a long time. Every sizable business pays attention to human resource management. For governments, the equivalent would be a form of national human resource management that considers education, migration, family, labor, health, and retirement as components that interact richly — and together drive the richness of the future.
The old countries are booming because the elderly people______.

选项 A、serve as a valuable asset
B、have strong personality
C、are increasing considerably
D、are in good health

答案A

解析    归因推理。根据第三段第一行“The young countries are poor,and the old countries are rich”,和第四段提到的“人的生产力因人而异,与年龄无关,受到良好教育的老年人依旧老有所为”,以及最后一句结论“The active aging of better-educated populations can be an asset rather than a problem”可知,老年人对社会来说是一种财富。【知识拓展】归因推理题需要捕捉作者的论证思路。难度较大的归因推理不会只局限一段,往往需要从几个连续或不连续段落中跟踪作者的写作逻辑,这是比较高级的命题思路,能检验出读者更高的阅读水平。
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