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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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

单项选择题

According to the passage, a dog can still move in a coordinated manner, eat and sleep, and even bark when__________.

A．nerve cells are removed
B．the skull is removed
C．the hemispheres are removed
D．the cerebral cortex is removed