单项选择题

The word "seat" ( Line 8, Para. 2) probably means __________.

A．a chair
B．a part of the body
C．a place where something is
D．cortex
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单项选择题
Which of the following headings is the best title for this passage
A．The Cerebral Cortex
B．The Specific Layers of Neurons
C．The Organization of the Brain
D．The Cerebral Hemispheres
单项选择题
The organization of brain is characterized by __________.
A．the interior of the skull
B．different regions responsible for different functions
C．the outer layer—the cerebral cortex
D．the nerve cells densely packed
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