阅读下面这首诗，完成后面问题。
                                                                                                                                           菊 花
                                                                                                                                           元 稹
                                                                                                                 秋丛绕舍似陶家，遍绕篱边日渐斜。
                                                                                                                 不是花中偏爱菊，此花开尽更无花。

下图表示环境条件发生变化后某个种群中A和a基因频率的变化情况，下列说法错误的是（        ）

做平抛运动的物体，每秒速度的增量总是（   ）