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  3. Branding an age category might sound like a frivolous exercise. But life stages are primarily social constructs, and history sho

Branding an age category might sound like a frivolous exercise. But life stages are primarily social constructs, and history sho

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问题     Branding an age category might sound like a frivolous exercise. But life stages are primarily social constructs, and history shows that their emergence can 【C1】______ deep changes in attitudes. Such change is needed 【C2】______ the questions that swirl around rising longevity are to get a 【C3】______ answer.
    Before 1800 no country in the world had an average life 【C4】______ at birth beyond 40. Today there is not a country that does not. 【C5】______ 1900, more years have been 【C6】______ human life than in the rest of history combined, 【C7】______ by reducing child mortality and lately by 【C8】______ lifespans. Longevity is one of humanity’s great 【C9】______.
    【C10】______ it is seen as one of society’s great headaches. The problem 【C11】______ the increasing dependency of the old on the young. By 2100, the ratio of 65-plussers to "working-age" people will triple. 【C12】______ the world greys, growth, tax revenues and workforces will 【C13】______ while spending on pensions and health care will increase. So, 【C14】______, goes the orthodoxy.
    Doom-mongers tend to miss a bigger point, however. Those extra years of life are 【C15】______ healthy ones. Five of the additional six years that a British boy born in 2015 can expect to live, 【C16】______ one born in 1990, will be healthy, according to the Institute for Health Metrics and Evaluation, at the University of Washington. Too many governments and firms fail to 【C17】______this fact, instead lumping all the extra years in the damning category of 65 and over. This binary way of thinking, seeing retirement as a cliff edge 【C18】______ which workers and consumers suddenly tumble, 【C19】______ little relation to the real world. It also encourages unimaginative policy, 【C20】______ the retirement age is occasionally moved as lifespans lengthen.
【C14】
选项 A、at worst
B、at best
C、at most
D、at least
答案D
解析 词组辨析题。根据语境可知，此处意思为“起码社会主流观点是这样认为的。”四个选项A项at worst“在最坏的情况下”，B项at best“在最好的情况下”，C项at most“最多”，D项at least“至少，最起码”，因此本题应选择D项at least。
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