阅读下面的诗歌，完成后面的题目。

                                                                                                        江 上

                                                                                                 （宋•王安石）
                                                                                                 江北秋阴一半开，

                                                                                                 晚云含雨却低徊。

                                                                                                 青山缭绕疑无路，

                                                                                                 忽见千帆隐映来。

阅读下面文字，按要求作文。

请以“让我想一想”为题，写一篇作文。文体自选，不少于600字。不得出现真实的校名、人名。

点P关于原点对称的点Q的坐标是（-1,3）,则P的坐标是____