单项选择题

Who play professional football in the United States

A．Native born American citizens.
B．Europeans.
C．South Americans.
D．North Americans.
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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
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
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