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

科目 生物   题型 连线题   难度 较易