—         did they go on vacation?                

—Last weekend.[ ]

A. Where                    

B. How              

C. Why                    

D. When

* * 球腺

A． * * 旁腺
B．阴蒂
C．前庭大腺
D．大阴唇
E．前庭球
男，女性器官互为同源器官的是