下列动物中无运动器官的是A．鲫鱼B．蚂蚁C．草履虫D．家鸽-八年级生物

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• 使用显微镜观察草履虫时，经常在临时装片的培养液中放一些棉丝，其作用是（）A．限制草履虫运动B．增加营养C．便于计数D．增加温度-七年级生物
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• 草履虫体内的食物残渣及二氧化碳的排出分别通过哪一组结构来完成的？（）A．口沟、表膜B．胞肛、胞咽C．收集管伸缩泡D．胞肛、表膜-九年级生物
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• 结合下图所示生物，回答问题（1）需借助来观察这些生物的内部结构。（2）它们都属于生物，A的名称是。B进行光合作用的场所是，C通过与外界进行物质交换。（3）上述生物中具有细胞壁-七年级生物
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• 关于单细胞生物的说法正确的是生物（）。A．能独立完成各种生命活动B．都属于动物类群C．都在一定程度上净化污水D．都必须生活在水中-七年级生物
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