蚯蚓的体壁上的粘液经常保持湿润,这有利于蚯蚓的(     )     

蚯蚓的体壁上的粘液经常保持湿润,这有利于蚯蚓的(     )

      A.运动                B.呼吸作用               C.吸收营养               D.排泄

答案

B

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