将下列结构功能的代号（A、B、C、D、E）填写在草履虫相应结构前的括号内（）1、表膜A、排出食物残渣（）2、纤毛B、消化吸收食物（）3、口沟C、食物的入口（）4、食物泡D、运动（）5、胞肛-七年级生物

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