文艺复兴运动实质上是一次 ______ 的文化革命。 ( )
A．奴隶主阶级
B．封建阶级
C．资产阶级
D．无产阶级
参考答案：C
执行下列命令后显示的结果是 ______。 SJ=“FoxPro数据库” SUBSTR(SJ，LEN(SJ)/2，6)
A．FoxPro
B．数据库
C．数据
D．ro数据
____ it comes to traffic rules, I often come across such cases _____ the local drivers obviously know
them but won't follow them. [ ]
A. If; why
B. As; which
C. Once; as
D. When; where
