2. 外语
  3. A. by social and economic changes B. guided self-study and correspondence courses C. by studying together with children

A. by social and economic changes B. guided self-study and correspondence courses C. by studying together with children

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问题     A. by social and economic changes
    B. guided self-study and correspondence courses
    C. by studying together with children
    D. what they did not manage to learn earlier
    E. dates back to the eighteenth century
    F. mass production
Adult education has been made necessary by ______.
选项
答案A
解析 利用“necessary”作为答案线索词，则在第3段的最后一句找到答案相关句：“These and other factors(great economic and social changes)produced a need for further education and reeducation of adults. ”
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