24. ---By the way, what’s your opinion about that, Jack?

---To be practical, I prefer to live in the country farming ______ stay in the city living poorly.

A．rather than

B．would rather

C．more than

D．had better

目前流行的关系数据库系统一般都提供多种安全措施，以下不属于安全措施的是（）

A.封锁

B.视图

C.权限

D.加密