—Mary with her parents often ________to the zoo on Sundays. What about you?        

—I don't often go there. But sometimes I go to see the animals on Saturdays.      [ ]

A. go      

B. goes      

C. going      

D. to go

下列属于直线型组织结构优点的是（）

A.专业化分工

B.权利集中

C.结构简单

D.不适应变化

E.利于高层管理者决策