The passage focuses on the need for Americans to learn foreign languages. The writer discovered Esperanto while doing ______ on

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问题 The passage focuses on the need for Americans to learn foreign languages.
The writer discovered Esperanto while doing ______ on foreign language learning.

选项

答案web research

解析 The writer discovered Esperanto while doing ______ on foreign language learning词汇线索为discovered Esperanto,则应出现在文章首次出现Esperanto的地方,因此定位到第六段末句,向上扫描寻找答案。
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