A：x2+y2
B：x2﹣y
C：x2+x+1
D：x2﹣2x+1
Most of my friends, _________ Sandy, Jimmy and Angela,are all kind to me.
下列各句中，划线成语使用不正确的一项是（ ）
Our school library has floors, and the reading room is on the floor.
