阅读下面这首宋词,然后回答问题。(8分)
蝶恋花①
陆 游
桐叶晨飘蛩夜语。旅思秋光,黯黯长安路。忽记横戈盘马处,散关清渭应如故。 江海轻舟今已具。一卷兵书,叹息无人付。早信此生终不遇,当年悔草《长杨赋》②。
[注] ①本词是陆游晚年被罢官后所作。②《长杨赋》:汉代扬雄为讽谏汉成帝游幸长杨宫而作。
1.首句景物描写有何作用?(4分)
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2.下片表达了作者怎样的情感?请作简要分析。(4分)
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