古诗鉴赏
                                                                            观游鱼    
                                                                            白居易
                                                         绕池闲步看游鱼，正值儿童弄钓舟。
                                                         一种爱鱼心各异，我来施食尔垂钓。

某极难溶于水的无毒气体，它的密度约是空气密度的$\frac{4}{9}$，那么在实验室中收集这种气体的方法可以是(   )

①向上排空气法      ②向下排空气法         ③排水法

小李同学照片被人传至网上，还配有不雅文字说明，使照片中的人的名声受到不好影响。小李同学的______受到侵犯。（    ）

Joe has caused many problems and his dad can't ______ good ways to solve his trouble.