第23题: [单项选择]From the passage we know that the nerve impulses in human beings ______. A. are lack of differentiation in quality B. are similar in size, number, and arrangements C. reveal qualitative diversity D. spasmodically pass through the nervous system 参考答案:A 答案解析:语义理解题。问人类的神经脉冲的性质。文章说:“…神经脉冲从本质上来讲在性质上都是一样的,它作为一般流通被传输到神经系统”(...that nerve impulses were essentially