绘制管道施工平面图时，一般工程需绘制（）几种平面图。
A.首层
B.标准层
C.地下室
D.设备层和顶层
参考答案：A, B, C, D
Cindy is a good student. She’s ________ the first to come to school. She ________ comes to school late.
A．often; always
B．never; sometimes
C．always; never
D．sometimes; usually
