题干
Our school library has floors, and the reading room is on the floor.
A：six; six
B：six; sixth
C：sixth; sixth
答案(点此获取答案解析）
B
Our school library has floors, and the reading room is on the floor.
A：six; six
B：six; sixth
C：sixth; sixth
÷ 
的结果是（ ）.