单层装配式工业厂房的柱间支撑，是为了加强厂房的______。
A．稳定性
B．整体性
C．横向刚度和稳定性
D．纵向刚度和稳定性
参考答案：D
城镇土地使用税的税率为( )税率。
A．定额 B．全额累进 C．比例 D．超额累进
Had they known what was coming next, they________ second thoughts.
A．may have
B．could have
C．must have had
D．might have had
