They're going ___________ my parents. [ ]
A. and
B. with
C. to
答案：B
蚯蚓对刺激的反应比较灵敏、准确，是因为
A．体表有刚毛
B．体壁能分泌粘液
C．体壁肌肉发达
D．有脑和腹神经索
仪器操作间的接电有哪些要求？
