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    Jack is a 13-year-old boy.

    One day, his father asks him, "How many letters are there in the alphabet(字母表)?"

    "24." He says.

    "24?" His father asks loudly, "Are you sure?"

    "Sorry, I don't know." Answers the son.

    "You don't know? You are in school for 7 years and you don't know how many letters there are in the alphabet?" The father is very angry(生气的).

    His son says, "No. But let me ask you a question, dad. You often go to the post office(邮局). Please tell me how many letters there are in the post office."

漫步在绿树成荫的小路上，空气特别清新和湿润，主要原因是植物进行了（   ）

阅读下面的材料，根据要求写一篇不少于800字的文章。

    什么是幸福？幸福是杜甫《闻官军收河南河北》中的“剑外忽传收蓟北，初闻涕泪满衣裳”；幸福是孟郊《登科后》中的“春风得意马蹄疾，一日看尽长安花。”；幸福是白居易《问刘十九》中的“晚来天欲雪，能饮一杯无”。

    这三种幸福，你认为那种更幸福？请结合材料内容及含意作文，体现你的思考、权衡与选择。

    要求选好角度，确定立意，明确文体，自拟标题；不要套作，不得抄袭。