I was so familiar with him that I recognized his voice _____ I picked up the phone.

A．as

B．after

C．the instant

D．while

分泌类固醇激素细胞的超微结构特点是：

A．有分泌颗粒

B．溶酶体多

C．粗面内质网和核糖体多

D．滑面内质网和管泡状嵴线粒体丰富

E．高尔基复合体发达