用现代汉语写出文中两个划线句子的意思。（5分）
28． What has happened to students these years according to the passage
5． When did the young man ________the army
依次填入下面一段文字横线处的语句，衔接最恰当的一组是（ ）（2分）
依次填入下面一段文字横线处的语句，衔接最恰当的一组是（ ）（2分）
请你写出一个有一根为1的一元二次方程：____________．
Children like comedies because they are ______ ．
Sunday was going to be the birthday for me and my other two classmates． As we were born in the (21) month，we decided to have a big party to (22) it．
阅读下面文段，回答问题。(2分)
Students can’t take magazines out of the reading room without permission（改为被动语态）
Please help me buy some______（梨），Lily．
23． The desk is _________．
（3）做细铁丝在氧气中燃烧的实验时，集气瓶底应预先________________________；
22．1 used to love this film when I was young，but I _________ it that way any more．
（2）若该商场获得利润为W 元，试写出利润 W与销售单价 x之间的关系式；销售单价定为多少元时，商场可获得最大利润，最大利润是多少元？