阅读王维的《鸟鸣涧》^①，完成题目。
                                                                                             《鸟鸣涧》^①                                                                                  

                                                                                     人闲桂花落，夜静春山空。
                                                                                     月出惊山鸟，时鸣春涧中。
      【注释】鸟鸣涧：地名，在王维朋友的家附近。