题干

下列对动物类群主要特征的描述,错误的是(     )

A:腔肠动物:身体呈辐射对称;体表有刺细胞;有□有肛门

B:鱼:生活在水中,体表常有鳞片覆盖;用鳃呼吸,通过尾部和躯干部的摆动以及鳍的协调作用游泳

C:软体动物:柔软的身体表面有外套膜;大多具有贝壳;运动器官是足

D:扁形动物:身体呈两侧对称;背腹扁平;有口无肛门

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A

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