下列各种自然现象形成的过程中，要吸收热量的是（　　）

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    It's Saturday. We don't have 1 to school. My father is 2 these days, and he still works at his office. My mother is an English teacher. She 3 work today. So I'm going shopping with 4 this afternoon. We have a lot of things 5. Look at our shopping list. We are going to buy some food and drinks. So we must go to the supermarket first. We live 6 the supermarket, so we are going to7 there. And we must go to some clothes shops. It's cold now. I have an old scarf. I want my mother to buy a new one8 me. I also want to buy a CD for Jack. It's his 9 birthday tomorrow. I think we are going to have dinner in a restaurant because we may have no time 10.

如图所示，CD∥AB，OE平分∠AOD，OF⊥OE，∠D=50°，则∠BOF为(       )

若（a+1）²+|2﹣b|=0，则b^a的值为（　　）