题目内容：

阅读下面这首词，完成问题。(8分)

鹊踏枝·过人家废园作

[清] 龚自珍[注]

漠漠春芜春不住。藤刺牵衣，碍却行人路。偏是无情偏解舞，濛濛扑面皆飞絮。绣院深沉谁是主？一朵孤花，墙角明如许。莫怨无人来折取，花开不合阳春暮。

[注] 龚自珍自幼博通多才，嘉庆十五年(1810)应顺天乡试竟只中了副榜，三年后再试又落榜，这首《鹊踏枝》就写于这一时期。

1.这首词主要运用了什么表现手法？体现了词人怎样的情怀？(4分)

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2.请评析“孤花”这一艺术形象。(4分)

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