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
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
单项选择题
The visual part of the cortex is especially interesting because __________.
A．specific layers of neurons are sensitive to particular orientations of input Stimuli
B．much of the structure is genetically predetermined
C．horizontal lines are stimulated
D．vertical lines are stimulated
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