企源知识库

Lying under the skull, the human brain contains an average of the ten billion nerve cells called ______.
A、neurons
B、nerve system
C、nerves
D、cerebral cortex
【正确答案】：A
【题目解析】：在头骨的下面，人类的大脑平均含有一百亿个被称为神经元的神经细胞。