题目

根据短文内容，从短文后所给A、B、C、D、E五个选项中，选出最佳选项。 Teenage depression (抑郁) isn't just a bad mood. It's a serious problem that affects everyaspect of a teen's life. Here are some ways ofdealing with your depression. Try not to isolate(使孤立) yourself Just getting out of bed inthe morning can be difficult, but isolating yourself only makes things worse.Make it a point to stay social, even if it's the last thing you want to do. Do any physical activity Making healthy lifestyle choices can dowonders for your mood. You can benefit fromexercisi在生物分类的等级单位中，最大和最小的分类单位分别为A. 门、界 B. 界、科 C. 纲、种 D. 界、种