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220C207听第10段材料,回答第17至第20题。17Whatisthepopulatio
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CostaRicai
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第二部分:阅读理解〔共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的四个选项(A、BC和D中,选出最佳选项,并在答题卡上将该项涂黑AJoh
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