When was the article probably written? [br] Since these years, American adults h

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问题 When was the article probably written? [br] Since these years, American adults have improved the most in ______.

选项 A、performing math problems
B、finding information in a book
C、answering questions involved numbers
D、comparing two different newspaper commentaries

答案 C

解析见文章最后一段。其中选项A偷换了概念，与原文不符，因此不选。

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