石菖蒲横切面显微可见（）
A.油室
B.油管
C.含橘黄色油滴的分泌细胞
D.晶纤维
E.乳汁管
参考答案：D
八边形从一个顶点出发可以引______条对角线，把八边形分割成______个三角形，八边形共有______条对角线．
Senior citizens in that country enjoy certain_______, such as free medical care and free entry to public parks ?
A．privileges
B．reputations
C．invitations
D．possessions
