西塞罗：“在你们面前受审的是个有钱人，他指望以财富来开脱罪名；……我说的这个人就是凯厄斯·弗里斯（行省总督）。假如今天他不能受到应有的惩处，那不是因为缺乏证据，也不是因为缺乏检察官，而是因为司法官失职。”对上述材料解读正确的有（    ）

①西塞罗是罗马帝国的法官

②西塞罗认为罗马的法律体系应进一步完备

③司法公正是法学进步的重要表现

④体现了追求人人生而平等的法律思想

辨析题

阅读理解B
    Last Friday night l went to a great party．It was a birthday party for my teacher Mrs Brown．Students in my class all went to celebrate Mrs Brown's 40th birthday．We began to arrange(筹备)the party two weeks ago，but Mrs Brown knew nothing about it．
    We all met at a restaurant at 6：45 pm．There were 30 people．Mrs Brown's son took her to the restaurant and they arrived at seven o'clock．Just before seven，we all stayed in one room of the restaurant and made the room dark．
    When they got to the restaurant．Mrs Brown's son asked her to go into the room first．Then we all shouted．"Surprise!”
    Mrs Brown was really surprised．She jumped when she heard us．Then we sang Happy Birthday To You and she knew what was happening，We all had a great dinner and then a delicious birthday cake．
    For her birth-day,Mrs．Brown got a beautiful quilt(被子).We printed our photos on it．So it was a very special quilt．
    Mrs Brown enjoyed her evening，and we enjoyed it too．
根据材料内容选择最佳答案。

用零价铁（Fe）去除水体中的硝酸盐（NO₃^﹣）已成为环境修复研究的热点之一．

若均为正实数，则的最大值为        (       )