2．将下列水生动物与它们的类别连线

                                         珊瑚                            软体动物    

                                         章鱼                     腔肠动物

                                         海豚                            甲壳动物    

                                         虾                        哺乳动物

                                         海马                            鱼类    

                                         海龟                     爬行动物