用显微镜跟踪观察运动着的草履虫,会发现其体内的食物泡是(   

用显微镜跟踪观察运动着的草履虫,会发现其体内的食物泡是(   

A.多个,均大小相等,缓缓移动    B.两个,大小相等,但交替收缩

C.多个,均缓缓移动,逐渐变小    D.多个,均大小相等,相对静止

答案

C

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