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    【题目】在20世纪80年代中期，美国的白领工人人数已占全国劳动力总数的一半以上，从事体力劳动的工人人数正在日益减少’而从事技术性、信息性和智力性工作的非生产性知识型人员的队伍却在不断地扩大。因此，可以推断美国

    A．知识型阶层将成为社会的主体

    B．非生产人数占劳动力的大多数

    C．人们逐渐摆脱繁重的体力劳动

    D．产业结构已发生了革命性变化

    【答案】D

    【解析】本题考查二战后美国经济结构的变动。题干说“在20世纪80年代中期，美国的白领工人人数已占全国劳动力总数的一半以上……从事技术性、信息性和智力性工作的非生产性知识型人员的队伍却在不断地扩大”，可见现代信息技术发展达到一定水平后，美国经济完成了向信息化的转变，产业构成出现革命性变化，D正确。单凭白领工人人数占劳动力一半以上和非生产性知识型人员队伍不断扩大无法确定知识型阶层是否会成为社会主体，排除A项；人们摆脱体力劳动和非生产人数占大多数的结论均不准确，排除BC两项。故本题正确答案为D项。

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