埃及是“尼罗河的馈赠”。这里曾经孕育的文明成果是（    ）

下列算式中，商最大的算式是（   ）。

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。