某医院建筑，建筑耐火等级为一级，内部设有自动灭火设备，层数为五层，每层最大允许建筑面积应为( )m²。

A．1200
B．2000
C．2500
D．5000

Many people thought little of me, but I did what _____.

A．I thought I was right

B．I thought it was right

C．I thought was right

D．I was thought right