已知不等式组$\left\{\begin{array}{c}y-1\ge 0\\ x+y-4\le 0\\ y-1\le k\left(x-1\right)\end{array}\right.$（k＞0）表示的平面区域为D，若∀（x，y）∈D，$\frac{y}{x^2}$≤1恒成立，则实数k的取值范围是____ 

阅读下面这首古诗，完成两小题。
                                                                                                              齐安郡中偶题
                                                                                                               （唐）杜牧
                                                                                           两竿落日溪桥上，半缕轻烟柳影中。
                                                                                           多少绿荷相倚恨，一时回首背西风。
                                                                                                             暮热游荷池上
                                                                                                            （宋）杨万里
                                                                                             细草摇头忽报侬，披襟拦得一西风。
                                                                                             荷花入暮犹愁热，低面深藏碧伞中。

跨经度最广的大洲和大洋分别是（    ）