小伊是个初中生，她学习成绩不好，纪律性较差，上课精神不集中。有一天，小伊上课趴在桌子上睡觉，老师一怒之下把小伊赶出了教室

With every sun comes a new day.A new beginning.A hope that things will be better today than they were yesterday.But not for me.My name's Eep.And this is my family.The Croods.If you weren't clued already,by animal skin,and sloping forehead,we are cavemen.Most days we spend in our cave.In the dark.Night after night,day after day.Yep.Home sweet home.
When we did go out,we struggled to find food in a harsh and hostile world.And I struggled to survive my family.We were the last ones around.There used to be neighbors.The Gorts,smashed by a mammoth.The Horks,swallowed by a sand snake.The Erfs,mosquito bite.The Throgs,common cold.And the Croods.That's us.
The Croods made it,because of my dad.He was strong,and he followed the rules.The ones painted on our cave walls:Anything new is bad.Curiosity is bad.Going out at night is bad.Basically,anything fun is bad.Welcome to my world!But this is a story about how all that changed in an instant.Because what we didn't know,was that our world was about to come to an end.And there were no rules on our cave walls to prepare us for that.