— No, you ________ wear your school uniforms. That's the school rule.

阅读下文，回答相关问题。

                                                                                                                             己亥杂诗  龚自珍
                                                                                                                             浩荡离愁白日斜，

                                                                                                                             吟鞭东指即天涯。

                                                                                                                             落红不是无情物，

                                                                                                                             化作春泥更护花。

抛物线$y=-4x^2$的焦点坐标为（     ）

读图，完成下列问题．