属于萘醌的是
A．紫草素B．丹参醌C．大黄素D．番泻苷E．芦荟苷
参考答案：A
They often ________ at five in the afternoon.[ ]
A. go there
B. go to there
C. goes there
D. going there
按值可否分解，数据类型通常可分为两类，它们是 ( )
A．静态类型和动态类型 B．原子类型和表类型 C．原子类型和结构类型 D．数组类型和指针类型
