单项选择题

Human linguistic ability largely depends on the structure and dynamics of ().

A. human brain
B. human vocal cords
C. human memory
D. human

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单项选择题
The most important part of the brain is the outside surface of the brain, called ().

A. the neurons
B. nerve pathways
C. cerebral cortex
D. sensory organs
单项选择题
Lying under the skull, the human brain contains an average of () nerve cells called neurons.

A. 100 million
B. 10 billion
C. 100 billion
D. 10 million
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