阅读诗歌，回答问题。

                                                                                                                                       绝句

                                                                                                                                    (唐)杜甫

                                                                                                                    迟日江山丽，春风花草香。

                                                                                                                    泥融飞燕子，沙暖睡鸳鸯。

      【注释】泥融：指冻泥融化，又软又湿。

食物消化和吸收的主要器官是（　　）

你能提出什么数学问题？

夏天吃冰棒感到凉快,扇扇子也感到凉快,请你分析这两种“凉快”的原因。