2. 外语
  3. Population aging is a triumph of civilization. It is the【C1】______consequence of attaining desired smaller family sizes and long

Population aging is a triumph of civilization. It is the【C1】______consequence of attaining desired smaller family sizes and long

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问题     Population aging is a triumph of civilization. It is the【C1】______consequence of attaining desired smaller family sizes and longer lives, with many living beyond 100 years. This achievement,【C2】______, requires vital social and economic adjustments .【C3】______. expected future demographic (人口的) realities. In particular, population aging raises critical issues【C4】______economic growth, employment and retirement,【C5】______. health care and social support services. As a population ages, the【C6】______of elderly increases, and that of children decreases. For much of the past, children outnumbered (超过) the elderly by a factor of more than six to one. Today the ratio has【C7】______to about three children per one older person.【C8】______within the next few decades, perhaps by 2060, the world’s elderly population will begin to【C9】______the population of children, when each group is expected to【C10】______for slightly less than one-fifth of the world population. Developed countries have already moved well along this transformation. But a notable【C11】______is the comparatively young U.S. population, where the number of children is 50%【C12】______than those aged 65 and older.
    Developing countries are now【C13】______a similar aging process, but【C14】______a much faster pace. Many developing countries that have experienced rapid fertility (人口出生率) are passing through this transition in a【C15】______of 25 years or less. As a(n)【C16】______of such rapid changes, accommodating the necessary social and economic adjustments to older population age structures will likely be【C17】______more difficult for developing countries.
    The wide【C18】______of consequence of population aging is of mounting【C19】______and significance for more developed countries — and are also【C20】______a worry for less developed countries.
【C15】
选项 A、extension
B、scale
C、rank
D、span
答案D
解析 语义衔接题。结合语境，此处应该是说发展中国家经历这一转变需要25年左右，[D]span表示(某事物)自始至终的持续时间或期间，与空后的25 years or less照应，故为答案。[A]extension“扩张;延长的时间”；[B]scale“规模；范围”；[C]rank“等级；军衔”。
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大学英语四级

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