It’s clear that people with ________ opinions may do things ________.

A．different; differently

B．difference; different

C．different; difference

D．differently; different

组成正羽的结构是（）。

A.羽毛和绒羽；

B.羽片.绒羽和羽轴；

C.羽片和羽轴；

D.绒羽和羽轴。