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

超过系统使用有效期的车票称为（）

A．预制单程票 

B．无效票 

C．废票 

D．过期票