【提出问题】溶液中的溶质是什么物质？

根据短文，选择正确选项。

    One day, the teacher asks the boys and girls a question. “Swallows（燕子） fly to the south before winter1,”he says. “But why don't cats and dogs do2?” Fox lifts （举） his3as usual. “Yes, Fox?” says the teacher4. Fox stands （站） up and says, “5they have no wings （翅膀）.”

某报社正在举办征集“献给母亲的一句话”活动，你也将参与这项活动，你献给母亲的一句话是____。