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.
【C6】
选项 A、portion
B、rate
C、proportion
D、percentage
答案C
解析 语义衔接题。随着人口的老龄化，老年人在人口中的比例会增加，孩子的比例会下降，故答案为[C]proportion“比例”，强调与整体相关的一部分。[A]portion“部分”常用来指较大东西中的一部分或一定数量；[B]rate“比率”指一个确定数量对另一个所测数量的比例或者指与特定数额或数量有关的费用或收费；[D]：percentage“百分比”。
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大学英语四级

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