下列四个等式：①$\sqrt{{\left(-4\right)}^2}$=4；②（﹣$\sqrt{4}$）²=16；③（$\sqrt{4}$）²=4；④$\sqrt{{\left(-4\right)}^2}$=4．正确的是（　　）

默写：

①____，欲语泪先流。

②____，载不动许多愁。

    Two farmers were on their way home one evening after a hard day's work．Both were tired．They happened to look up at the sky and saw a black cloud overhead．
    "Ah!" said one farmer, "tomorrow we shall have rain and the rice will grow well．" The second answered, "Nonsense （胡说）, the rain will only kill the crops （庄稼）．"
    So they began to fight．Just then a third farmer came along and asked them why they were quarreling（争吵）．Both farmers explained about the black cloud．
    "What cloud?" asked the third farmer．They all looked at the sky．The cloud was no longer there．

读“地球自转示意图”，回答下题

下列事件中，属于必然事件的是(     )