下列两幅图表明,20多年来,厦门发生了翻天覆地的变化,其原因是

下列两幅图表明,20多年来,厦门发生了翻天覆地的变化,其原因是                       

       A.引进先进技术                                   B.对外开放

       C.引进先进管理经验                             D.引进外资

答案

B

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