下列关于道德与法律的关系表述正确的是（  ）

①道德与法律都规范人们行为

②道德是隐藏的法律，法律是显露的道德

③法律是靠国家强制力保证实施的

④道德水平的提高有利于人们自觉守法、护法

读一读，给下列句子排序。

 ____ He washed clothes and cleaned his room on Saturday afternoon.

 ____ Last weekend was Wu Yifan's grandma's birthday.

 ____ On Sunday morning, he played football with his friends.

 ____ He visited his grandma on Saturday morning.

 ____ He watched TV Saturday evening.

古诗云：“须臾十来往，犹恐巢中饥；辛勤三十日，母瘦雏渐肥．”这描述的是母鸟哪种行为（　　）