童年时，我们经常唱起一首儿歌“小燕子，穿花衣，年年春天来这里……”春天燕子从南方飞到我们这里来，主要是受哪种非生物因素的影响。（  ）

《礼记·中庸》中说：“万物并育而不相害，道并行而不相悖。”这段话不适合用来形容（      ）

                                                                                                    夏日南亭怀辛大
                                                                                                            孟浩然
                                                                                           山光忽西落，池月渐东上。
                                                                                           散发乘夕凉，开轩卧闲敞。
                                                                                           荷风送香气，竹露滴清响。
                                                                                           欲取鸣琴弹，恨无知音赏。
                                                                                           感此怀故人，中宵劳梦想。