定义一种运算☆，其规则为a☆b=$\frac{1}{a}$+$\frac{1}{b}$，根据这个规则，计算2☆3的值是（　　）

阅读《背影》片段，完成后面的题目。
       我说道：“爸爸，你走吧。”他往车外看了看说：“我买几个橘子去。你就在此地，不要走动。”我看那边月台的栅栏外有几个卖东西的等着顾客。走到那边月台，须穿过铁道，须跳下去又爬上去。父亲是一个胖子，走过去自然要费事些。我本来要去的，他不肯，只好让他去。我看见他戴着黑布小帽，穿着黑布大马褂，深青布棉袍，蹒跚地走到铁道边，慢慢探身下去，尚不大难。可是他穿过铁道，要爬上那边月台，就不容易了。他用两手攀着上面，两脚再向上缩；他肥胖的身子向左微倾，显出努力的样子，这时我看见他的背影，我的泪很快地流下来了。我赶紧拭干了泪。怕他看见，也怕别人看见。我再向外看时，他已抱了朱红的橘子往回走了。过铁道时，他先将橘子散放在地上，自己慢慢爬下，再抱起橘子走。到这边时，我赶紧去搀他。他和我走到车上，将橘子一股脑儿放在我的皮大衣上。于是扑扑衣上的泥土，心里很轻松似的。过一会说：“A_____________”我望着他走出去。他走。了几步，回头看见我，说：“B______________”等他的背影混入来来往往的人里，再找不着了，我便进来坐下，我的眼泪又来了。

客有吹洞箫者，倚歌而和之。其声呜呜然，如怨如恭，____，____，不绝如缕。(苏轼《赤壁赋》)

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