题目

单词拼写。【小题1】The children are walking on the grass with ________ (光的) feet.【小题2】Everyone was given a ________ (毕业证书) at the end of the course.【小题3】If the show is too controversial, we’ll lose our ________ (赞助人).【小题4】I can’t remember where I’ve left my umbrella; my mind is a complete ________ (空白)! 【小题5】We would have won the __________ (冠军称号) if we had practiced harder.【小题6】That s_________ of the road is still closed, so you have to choose another road.【小题7】It is traditional for the b__________ to下图表示动作电位传导的示意图。下列叙述正确的是（ ）A．轴突膜处于②状态时，钾离子通道关闭，钠离子通道大量开放B．处于③与④之间的轴突膜，由于钠离子通道大量开放，膜外钠离子大量涌入膜内C．长期的动物组织培养过程中，能够使多种类型的细胞同时保持下来轴突膜外侧局部电流的方向与兴奋传导方向相同D．a处只有在兴奋传到后才能合成神经递质