直线$l$经过$A\left(2,1\right),B\left(1,m^2\right)\left(m\in R\right)$两点，那么直线$l$的倾斜角的取值范围（ ）

    This is my room (房间).I have a new desk and a chair.The book is on the desk.The ruler is under the book.My eraser is in the pencil box.My bag is on the chair.Where's my cat? It's under the chair.It's sleeping (睡觉).

____分布于人的全身，有____的作用。