【正确答案】 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 homogeneous in quality and were transmitted as common currency，throughout the nervous system)，所以人类的神经脉冲缺乏差异性，并持续不断地通过神经系统。