13．These talented andenergetic（精力旺盛的） young citizens could be doing something more useful．

分析 這些有才華的，精力旺盛的年青公民能做更有用的事情．

解答 答案：energetic
考查翻譯填空．根據(jù)句意和句子結(jié)構(gòu)，要填入形容詞，energetic意為"精力旺盛的"，是形容詞作定語．

點評 考查翻譯填空，準(zhǔn)確地理解句子、翻譯句子，然后根據(jù)句意及提示確定所填單詞詞性，正確寫出單詞完成句子，使句意更通順．

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