阅读下面的古诗。
                                                                                                                                                  画眉鸟
                                                                                                                                                  欧阳修
                                                                                                                         百啭千声随意移，山花红紫树高低。
                                                                                                                         始知锁向金笼听，不及林间自在啼。

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优____    难____    作____    臼____    唤____