问题
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R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refri
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Lifelong learning is made a necessity by the ______.A.failure of schools to produce qualif
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The passage is mainly about______.A.formal and informal educationB.education and cultureC.
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Lucy and Lily is both in Class One.()
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She has a very good command of both German and French, and is now learning______ foreign l
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The relationship between formal education and economic growth in poor countries is widely