Breakfast is very important. It is one of the most important1of the day. To keep healthy, everyone should2a good breakfast.3the right food is necessary for good health. We may have eggs, bread, milk and so on,4breakfast. Many students go to school without breakfast5they get up late or their parents don't cook for them. It's6for their health.7breakfast children may not grow fast and may not study and play very well at school. They may8. And when they're ill, they will9a long time in recovering (恢复). I think everyone should have some good10habits. It is necessary.

在矩形ABCD中，有一个菱形BFDE（点E，F分别在线段AB，CD上），记它们的面积分别为S_ABCD和S_BFDE，现给出下列命题正确的是（   ）

①若 $\frac{S_{△ABCD}}{S_{△BFDE}}=\frac{2+\sqrt{3}}{2}$ ，则 $\tan \angle EDF=\frac{\sqrt{3}}{3}$ ；

②若DE²=BD•EF，则DF=2AD．

当今社会，知识更新的速度越来越快，只有“乐学”的精神和“会学”的能力才永远不会过时。在学习过程中，我们中学生应该（    ）

①克服厌学情绪                 ②掌握科学的学习方法

③养成良好的学习习惯     ④投入“题海战术”