请将下列动物和所属类群用线连接起来。

A丹顶鹤                                                                  a软体动物

B鲫鱼                                                                       b鸟类

C对虾                                                             c鱼类

D蝙蝠                                                                       d节肢动物

E扬子鳄                                                                   e哺乳类

F乌贼                                                                        f爬行类

下列各项中不属于相对性状的是[ ]

A．植物的高茎和矮茎

B．家兔的黑毛和白毛

C．人的有酒窝和无酒窝

D．植物的绿色和动物的绿色